def sameCount(E, partialCount, boardColor):
# Final partial counts should be equal to the full count
for c in range(rowNum * columnNum + 1):
E.add_constraint(iff(totalCount[c], partialCount[rowNum- 1][columnNum - 1][c]))
# You can't have more pieces than you've already seen
for i in range(rowNum):
for j in range(columnNum):
for c in range((i * 7) + j + 2,rowNum * columnNum + 1):
E.add_constraint(~partialCount[i][j][c])
# First index: only black piece or red piece could possibly be true
E.add_constraint(iff(partialCount[0][0][0], ~boardColor[0][0]))
E.add_constraint(iff(partialCount[0][0][1], boardColor[0][0]))
#General pattern: Looks at the other color pieces to decide the current color piece.
for x in range(1, rowNum * columnNum):
i = x // columnNum
j = x % columnNum
E.add_constraint(iff(partialCount[i][j][0], partialCount[(i-1) if (j==0) else i][(columnNum-1) if (j==0) else (j-1)][0] & ~boardColor[i][j]))
for c in range(1,x+2):
increased = partialCount[(i-1) if (j==0) else i][(columnNum-1) if (j==0) else (j-1)][c-1] & boardColor[i][j]
stay_same = partialCount[(i-1) if (j==0) else i][(columnNum-1) if (j==0) else (j-1)][c] & ~boardColor[i][j]
E.add_constraint(iff(partialCount[i][j][c], increased | stay_same))
return E
def set_truth_encodings():
"""
Sets the constraints required to determine the state of the middle square
"""
# If there are any adjacent squares with a True y condition, the middle square
# is a mine. See the boolean condition guide (top) for an explanation
E.add_constraint(
iff((y[1][1] | y[1][2] | y[1][3] | y[2][1] | y[2][3]
| y[3][1] | y[3][2] | y[3][3]), m[2][2]))
# If there are any adjacent squares with a True x condition, the middle square
# is safe. See the boolean condition guide (top) for an explanation
E.add_constraint(
iff((x[1][1] | x[1][2] | x[1][3] | x[2][1] | x[2][3]
| x[3][1] | x[3][2] | x[3][3]), s[2][2]))
# If the middle square isn't a mine or safe, it is unknown
E.add_constraint(iff(~m[2][2] & ~s[2][2], u[2][2]))
def validBoard(E):
for i in range(rowNum):
for j in range(columnNum):
# If position(i, j) is empty, then neither black or red can occupy position(i, j).
E.add_constraint(emptyBoard[i][j] >> (~redBoard[i][j] & ~blackBoard[i][j]))
# If position(i, j) is red, then neither black and empty can occupy position(i, j)
# Calls gravity constraint
E.add_constraint(redBoard[i][j] >> (~blackBoard[i][j] & ~emptyBoard[i][j] & gravityRule(i, j)))
# If position(i, j) is black, then neither red and empty can occupy position(i, j)
# Calls gravity constraint
E.add_constraint(blackBoard[i][j] >> (~redBoard[i][j] & ~emptyBoard[i][j] & gravityRule(i, j)))
# Here to make sure implication works properly above, exactly one has to be true.
E.add_constraint(emptyBoard[i][j] | redBoard[i][j] | blackBoard[i][j])
# General: ColorWin if and only if there is ColorRowWin, or
# ColorColumnWin, or ColorDiagonalWin.
E.add_constraint(iff(BlackWin, (BlackColumnWin() | BlackRowWin() | leftBlackDiagonalWin() | rightBlackDiagonalWin())))
E.add_constraint(iff(RedWin, (RedColumnWin() | RedRowWin() | leftRedDiagonalWin() | rightRedDiagonalWin())))
# General: NoWin if and only if there is notColorRowWin, and
# notColorColumnWin, and notColorDiagonalWin.
E.add_constraint(iff(NoWin, ((~BlackColumnWin() & ~BlackRowWin() & ~leftBlackDiagonalWin() & ~rightBlackDiagonalWin()) & (~RedColumnWin() & ~RedRowWin() & ~leftRedDiagonalWin() & ~rightRedDiagonalWin()))))
#All posibilities of Connect Four Game outcome
E.add_constraint(iff(BlackWin, (~RedWin & ~NoWin)))
E.add_constraint(iff(RedWin, (~BlackWin & ~NoWin)))
E.add_constraint(iff(NoWin, (~RedWin & ~BlackWin)))
return E
def columnWin(E, winColumnColor, boardColor):
for i in range(rowNum - 3):
for j in range(columnNum):
# Winning column and its position of either 4 red or 4 black slots within the column.
E.add_constraint(iff(winColumnColor[i][j], (boardColor[i][j] & boardColor[i+1][j] & boardColor[i+2][j] & boardColor[i+3][j])))
# Checks that there is a possible route to play in order to win by a column unless top row
if (i > 0):
E.add_constraint(winColumnColor[i][j] >> (emptyBoard[i-1][j]))
#Checks that only one column can win
special = winColumnColor[i][j]
false = ~true
for i2 in range(rowNum - 3):
for j2 in range(columnNum):
if (i != i2) | (j != j2):
false |= winColumnColor[i2][j2]
E.add_constraint(special >> ~false)
return E
def rowWin(E, winRowColor, boardColor):
for i in range(rowNum):
for j in range(columnNum - 3):
#Winning row and its position of either 4 red or 4 black slots within the row.
E.add_constraint(iff(winRowColor[i][j], (boardColor[i][j] & boardColor[i][j + 1] & boardColor[i][j + 2] & boardColor[i][j + 3])))
#Checks that there is at least one possible route to play in order to win by a row unless top row
if (i > 0):
E.add_constraint(winRowColor[i][j] >> (emptyBoard[i-1][j] | emptyBoard[i-1][j + 1] | emptyBoard[i-1][j + 2] | emptyBoard[i-1][j + 3]))
#Checks that only a single row channel can be a winning row channel
special = winRowColor[i][j]
false = ~true
for i2 in range(rowNum):
for j2 in range(columnNum - 3):
if (i != i2):
false |= winRowColor[i2][j2]
E.add_constraint(special >> ~false)
return E
def rightDiagonalWin(E, rightWinDiagonalColor, boardColor):
for i in range(rowNum - 3):
for j in range(columnNum - 4, columnNum):
#Winning diagonal going left and down.
E.add_constraint(iff(rightWinDiagonalColor[i][j-3], (boardColor[i][j] & boardColor[i+1][j-1] & boardColor[i+2][j-2] & boardColor[i+3][j-3])))
# Checks that there is a possible route to play in order to win by a right diagonal unless top row
if (i > 0):
E.add_constraint(rightWinDiagonalColor[i][j-3] >> (emptyBoard[i-1][j] | emptyBoard[i][j-1] | emptyBoard[i+1][j - 2] | emptyBoard[i+2][j - 3]))
# Only one right facing diagonal channel can be a winning diagonal channel
special = rightWinDiagonalColor[i][j-3]
false = ~true
for i2 in range(rowNum - 3):
for j2 in range(columnNum - 4, columnNum):
if (i != i2) | (j != j2):
if (i - 1 != i2) | (j + 1 != j2):
if (i - 2 != i2) | (j + 2 != j2):
if (i + 1 != i2) | (j - 1 != j2):
if (i + 2 != i2) | (j - 2 != j2):
false |= rightWinDiagonalColor[i2][j2-3]
E.add_constraint(special >> ~false)
return E
def test_iff(a: nnf.NNF, b: nnf.NNF):
c = operators.iff(a, b)
for model in nnf.all_models(c.vars()):
assert ((a.satisfied_by(model) == b.satisfied_by(model)
) == c.satisfied_by(model))
def encode_circuit_search(original_theory, num_gates, models=[]):
########
# Vars #
########
# Inputs to the circuit are the variables of the input theory
inputs = [Var(v) for v in original_theory.vars()]
if models:
input_clones = clone_varset(models, inputs, inputs)
else:
input_clones = {}
# Gates are either & | or ~
gates = []
gate_modalities = {}
for i in range(num_gates):
gates.append(Var(Gate(i)))
gate_modalities[gates[-1]] = {}
for m in ['and', 'or', 'not']:
gate_modalities[gates[-1]][m] = Var(GateType(gates[-1], m))
if models:
gate_clones = clone_varset(models, inputs, gates)
else:
gate_clones = {}
# Single (arbitrary) gate is the circuit output
output = gates[0]
# Connections between inputs/gates to gates, and transitivity
connections = {}
unconnections = {}
for src in inputs + gates[1:]:
connections[src] = {}
for dst in gates:
if src != dst:
connections[src][dst] = Var(Connection(src, dst))
if dst not in unconnections:
unconnections[dst] = {}
unconnections[dst][src] = connections[src][dst]
C = connections # convenience
orders = {}
for src in gates:
orders[src] = {}
for dst in gates:
orders[src][dst] = Var(Order(src,dst))
###############
# Constraints #
###############
''' add decorators for simplifying adding constraints (i.e. a conjunct)'''
conjuncts = []
# Orderings (to forbid cycles in the circuit)
for g1 in gates:
# Connection implies orders
for src in connections:
for dst in connections[src]:
if isinstance(src.name, Gate) and isinstance(dst.name, Gate):
conjuncts.append(~connections[src][dst] | orders[src][dst])
# Can't order before yourself
conjuncts.append(~orders[g1][g1])
# Transitive closure
for g2 in gates:
for g3 in gates:
conjuncts.append(~orders[g1][g2] | ~orders[g2][g3] | orders[g1][g3])
if FORCE_TREE:
# At max one outgoing connection on a gate
for src in gates[1:]:
for dst1 in connections[src]:
for dst2 in connections[src]:
if dst1 != dst2:
conjuncts.append(~connections[src][dst1] | ~connections[src][dst2])
# Every gate has at least one input
for dst in unconnections:
conjuncts.append(Or(unconnections[dst].values()))
# Every gate has at most two inputs and negation gates have at most one
for j in gates:
for i1 in inputs+gates[1:]:
for i2 in inputs+gates[1:]:
if not unique([j,i1,i2]):
continue
conjuncts.append(~gate_modalities[j]['not'] | ~C[i1][j] | ~C[i2][j])
for i3 in inputs+gates[1:]:
if not unique([j,i1,i2,i3]):
continue
conjuncts.append(~C[i1][j] | ~C[i2][j] | ~C[i3][j])
# Every gate has exactly one modality
for g in gates:
# At least one
conjuncts.append(Or(gate_modalities[g].values()))
# At most one
for m1 in ['and', 'or', 'not']:
remaining = set(['and', 'or', 'not']) - set([m1])
conjuncts.append(Or([~gate_modalities[g][m2] for m2 in remaining]))
# Re-usable theories
notneg_cache = {}
def notneg(src, dst, cloned_src=None):
if not cloned_src:
cloned_src = src
if (cloned_src,dst) not in notneg_cache:
notneg_cache[(cloned_src,dst)] = ~C[src][dst] | cloned_src
return notneg_cache[(cloned_src,dst)]
notpos_cache = {}
def notpos(src, dst, cloned_src=None):
if not cloned_src:
cloned_src = src
if (cloned_src,dst) not in notpos_cache:
notpos_cache[(cloned_src,dst)] = ~C[src][dst] | ~cloned_src
return notpos_cache[(cloned_src,dst)]
# Implement the gates
for g in gates:
ins = [i for i in inputs+gates[1:] if i != g]
conjuncts.append(~gate_modalities[g]['and'] | iff(g, And([notneg(src,g) for src in ins])))
t = Or([notpos(src,g).negate() for src in ins])
conjuncts.append(~gate_modalities[g]['or'] | iff(g, t))
conjuncts.append(~gate_modalities[g]['not'] | iff(g, t.negate()))
for m in models:
bitvec = model_to_bitvec(m, inputs)
orig_mapping = {**{input_clones[bitvec][i]: i for i in inputs if i != g},
**{gate_clones[bitvec][i]: i for i in gates[1:] if i != g}}
ins = orig_mapping.keys()
conjuncts.append(~gate_modalities[g]['and'] | iff(gate_clones[bitvec][g],
And([notneg(orig_mapping[src],g,src) for src in ins])))
t = Or([notpos(orig_mapping[src],g,src).negate() for src in ins])
conjuncts.append(~gate_modalities[g]['or'] | iff(gate_clones[bitvec][g], t))
conjuncts.append(~gate_modalities[g]['not'] | iff(gate_clones[bitvec][g], t.negate()))
# Finally, lock in the models
if models:
for m in models:
bitvec = model_to_bitvec(m, inputs)
for var in m:
if m[var]:
conjuncts.append(input_clones[bitvec][Var(var)])
else:
conjuncts.append(~input_clones[bitvec][Var(var)])
if original_theory.satisfied_by(m):
conjuncts.append(gate_clones[bitvec][output])
else:
conjuncts.append(~gate_clones[bitvec][output])
else:
for model in all_models(original_theory.vars()):
t = false # negating the conjunction because of the implication: flips the signs
for var,val in model.items():
if val:
t |= ~Var(var)
else:
t |= Var(var)
if original_theory.satisfied_by(model):
t |= output
else:
t |= ~output
conjuncts.append(t)
versions = {}
example = {}
for c in conjuncts:
cn = c.simplify().to_CNF()
stats = "(%d / %d / %d) > (%d / %d / %d)" % (c.simplify().size(), c.simplify().height(), len(c.simplify().vars()),
cn.size(), cn.height(), len(cn.vars()))
example[stats] = str(c.simplify())
versions[stats] = versions.get(stats, 0) + 1
print("Conjunct stats:")
for k in versions:
print("\n - (%d) %s: %s" % (versions[k], k, example[k]))
T = And(conjuncts)
return T.simplify(), inputs, gates, output, connections, unconnections, gate_modalities
def build_general_constraints(self):
E = self.theory
t = self.props.t
x = self.props.x
r = self.props.r
c = self.props.c
A = self.props.A
# Checking that each row and column have the correct number of tents
# Will need to be changed from exhaustive listing to some adder later
# This also verifies that the row and column hints are set properly
for i in range(self.num_rows):
# Ensure only one of r[i][...] is set
E.add_constraint(( r[i][0] & ~r[i][1] & ~r[i][2] & ~r[i][3]) | \
(~r[i][0] & r[i][1] & ~r[i][2] & ~r[i][3]) | \
(~r[i][0] & ~r[i][1] & r[i][2] & ~r[i][3]) | \
(~r[i][0] & ~r[i][1] & ~r[i][2] & r[i][3]))
# no tents
E.add_constraint(iff(r[i][0], ~x[i][0] & ~x[i][1] & ~x[i][2] & ~x[i][3] & ~x[i][4]))
# 1 tent
E.add_constraint(iff(r[i][1], ( x[i][0] & ~x[i][1] & ~x[i][2] & ~x[i][3] & ~x[i][4]) | \
(~x[i][0] & x[i][1] & ~x[i][2] & ~x[i][3] & ~x[i][4]) | \
(~x[i][0] & ~x[i][1] & x[i][2] & ~x[i][3] & ~x[i][4]) | \
(~x[i][0] & ~x[i][1] & ~x[i][2] & x[i][3] & ~x[i][4]) | \
(~x[i][0] & ~x[i][1] & ~x[i][2] & ~x[i][3] & x[i][4])))
# 2 tents
E.add_constraint(iff(r[i][2], ( x[i][0] & ~x[i][1] & x[i][2] & ~x[i][3] & ~x[i][4]) | \
( x[i][0] & ~x[i][1] & ~x[i][2] & x[i][3] & ~x[i][4]) | \
( x[i][0] & ~x[i][1] & ~x[i][2] & ~x[i][3] & x[i][4]) | \
(~x[i][0] & x[i][1] & ~x[i][2] & x[i][3] & ~x[i][4]) | \
(~x[i][0] & x[i][1] & ~x[i][2] & ~x[i][3] & x[i][4]) | \
(~x[i][0] & ~x[i][1] & x[i][2] & ~x[i][3] & x[i][4])))
# 3 tents
E.add_constraint(iff(r[i][3], x[i][0] & ~x[i][1] & x[i][2] & ~x[i][3] & x[i][4]))
for j in range(self.num_cols):
# Ensure only one of c[j][...] is set
E.add_constraint(( c[j][0] & ~c[j][1] & ~c[j][2] & ~c[j][3]) | \
(~c[j][0] & c[j][1] & ~c[j][2] & ~c[j][3]) | \
(~c[j][0] & ~c[j][1] & c[j][2] & ~c[j][3]) | \
(~c[j][0] & ~c[j][1] & ~c[j][2] & c[j][3]))
# no tents
E.add_constraint(iff(c[j][0], ~x[0][j] & ~x[1][j] & ~x[2][j] & ~x[3][j] & ~x[4][j]))
# 1 tent
E.add_constraint(iff(c[j][1], ( x[0][j] & ~x[1][j] & ~x[2][j] & ~x[3][j] & ~x[4][j]) | \
(~x[0][j] & x[1][j] & ~x[2][j] & ~x[3][j] & ~x[4][j]) | \
(~x[0][j] & ~x[1][j] & x[2][j] & ~x[3][j] & ~x[4][j]) | \
(~x[0][j] & ~x[1][j] & ~x[2][j] & x[3][j] & ~x[4][j]) | \
(~x[0][j] & ~x[1][j] & ~x[2][j] & ~x[3][j] & x[4][j])))
# 2 tents
E.add_constraint(iff(c[j][2], ( x[0][j] & ~x[1][j] & x[2][j] & ~x[3][j] & ~x[4][j]) | \
( x[0][j] & ~x[1][j] & ~x[2][j] & x[3][j] & ~x[4][j]) | \
( x[0][j] & ~x[1][j] & ~x[2][j] & ~x[3][j] & x[4][j]) | \
(~x[0][j] & x[1][j] & ~x[2][j] & x[3][j] & ~x[4][j]) | \
(~x[0][j] & x[1][j] & ~x[2][j] & ~x[3][j] & x[4][j]) | \
(~x[0][j] & ~x[1][j] & x[2][j] & ~x[3][j] & x[4][j])))
# 3 tents
E.add_constraint(iff(c[j][3], x[0][j] & ~x[1][j] & x[2][j] & ~x[3][j] & x[4][j]))
for i in range(self.num_rows):
for j in range(self.num_cols):
### Constrain that tents and trees can't be in the same square
E.add_constraint((~x[i][j] & ~t[i][j]) | (~x[i][j] & t[i][j]) | ( x[i][j] & ~t[i][j]))
### Constrain that tents can't be adjacent
# For each cell in the grid, if there is a tent there, then there can't be one:
# to the right, below, below and to the right, or below and to the left.
# I.e.
# |x|1
# -+-+-
# 4|2|3
# If x is a tent, then 1,2,3,4 must not be tents.
# We need to be careful to not exceed the bounds of our arrays however.
adjacent_cells = []
# Check if 1 is in bounds
if j < (self.num_cols - 1):
adjacent_cells.append(x[i][j+1])
# Check if 2 is in bounds
if i < (self.num_rows - 1):
adjacent_cells.append(x[i+1][j])
# 3 is in bounds iff both 1 and 2 are in bounds.
if len(adjacent_cells) == 2:
adjacent_cells.append(x[i+1][j+1])
# Check if 4 is in bounds
if i < (self.num_rows - 1) and j > 0:
adjacent_cells.append(x[i+1][j-1])
# Reduce adjacent cell list into formula saying that those cells are false
# (if we have any adjacent cells)
if len(adjacent_cells) > 0:
formula = reduce(lambda acc,x: acc & x, (~x for x in adjacent_cells))
E.add_constraint(x[i][j] >> formula)
### Constrain that tent must be adjacent to tree
# For each cell in the grid, if there is a tent there, then there must be
# a tree adjacent.
# I.e.
# |1|
# -+-+-
# 3|x|4
# -+-+-
# |2|
# If x is a tent, then one (or more) of 1,2,3,4 must be a tree.
# We need to be careful to not exceed the bounds of our arrays however.
adjacent_cells = []
# Check if 1 is in bounds
if i > 0:
adjacent_cells.append(t[i-1][j])
# Check if 2 is in bounds
if i < (self.num_rows - 1):
adjacent_cells.append(t[i+1][j])
# Check if 3 is in bounds
if j > 0:
adjacent_cells.append(t[i][j-1])
# Check if 4 is in bounds
if j < (self.num_cols - 1):
adjacent_cells.append(t[i][j+1])
# Reduce adjacent cell list into formula saying that one of those cells is true
# (if we have any adjacent cells)
if len(adjacent_cells) > 0:
formula = reduce(lambda acc,x: acc | x, adjacent_cells)
E.add_constraint(x[i][j] >> formula)
### Constrain that if t(i,j) is true, then exactly one of A(d,i,j) must be true for all d
# Get all A(d,i,j) that are valid (not out of bounds)
adjacency_entries = [A[d][i][j] for d in range(len(TentsAndTreesTheory.DIRECTIONS)) if A[d][i][j] is not None]
# Build up (A & ~B & ~C) | (~A & B & ~C) | (~A & ~B & C) expression
parts = []
for positive_adj in adjacency_entries:
# Build individual (A & ~B & ~C) and put it into parts
part_formula = positive_adj
for other_adj in adjacency_entries:
if other_adj == positive_adj:
continue
part_formula &= ~other_adj
parts.append(part_formula)
# OR all individual parts together
formula = reduce(lambda acc,x: acc | x, parts)
E.add_constraint(t[i][j] >> formula)
### Constrain that if x(i,j) is true, then exactly one of the A entries pointing at it must be true
# Get all A(d,i,j) that are valid (not out of bounds)
adjacency_entries = [self.safe_A(d,i-oi,j-oj) for d,(oi,oj) in enumerate(TentsAndTreesTheory.DIRECTIONS) if self.safe_A(d,i-oi,j-oj) is not None]
# Build up (A & ~B & ~C) | (~A & B & ~C) | (~A & ~B & C) expression
parts = []
for positive_adj in adjacency_entries:
# Build individual (A & ~B & ~C) and put it into parts
part_formula = positive_adj
for other_adj in adjacency_entries:
if other_adj == positive_adj:
continue
part_formula &= ~other_adj
parts.append(part_formula)
# OR all individual parts together
formula = reduce(lambda acc,x: acc | x, parts)
E.add_constraint(x[i][j] >> formula)
### More adjacency constraints, direction-specific
for d,(offset_i,offset_j) in enumerate(TentsAndTreesTheory.DIRECTIONS):
# Check if grid in this direction exists by checking the A matrix
if A[d][i][j] is None:
continue
### Constrain that if A(d,i,j) is true, then t(i,j) is true
E.add_constraint(A[d][i][j] >> t[i][j])
### Constrain that if A(d,i,j) is true, then x((i,j) + dirn) is true
E.add_constraint(A[d][i][j] >> x[i+offset_i][j+offset_j])
