examples/notebook/contrib/eq20.ipynb
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First, you must install ortools package in this colab.
%pip install ortools
Eq 20 in Google CP Solver.
Standard benchmark problem.
Compare with the following models:
This model was created by Hakan Kjellerstrand ([email protected]) Also see my other Google CP Solver models: http://www.hakank.org/google_or_tools/
from ortools.constraint_solver import pywrapcp
def main():
# Create the solver.
solver = pywrapcp.Solver("Eq 20")
#
# data
#
n = 7
#
# variables
#
X = [solver.IntVar(0, 10, "X(%i)" % i) for i in range(n)]
X0, X1, X2, X3, X4, X5, X6 = X
#
# constraints
#
solver.Add(-76706 * X0 + 98205 * X1 + 23445 * X2 + 67921 * X3 + 24111 * X4 +
-48614 * X5 + -41906 * X6 == 821228)
solver.Add(87059 * X0 + -29101 * X1 + -5513 * X2 + -21219 * X3 + 22128 * X4 +
7276 * X5 + 57308 * X6 == 22167)
solver.Add(-60113 * X0 + 29475 * X1 + 34421 * X2 + -76870 * X3 + 62646 * X4 +
29278 * X5 + -15212 * X6 == 251591)
solver.Add(49149 * X0 + 52871 * X1 + -7132 * X2 + 56728 * X3 + -33576 * X4 +
-49530 * X5 + -62089 * X6 == 146074)
solver.Add(-10343 * X0 + 87758 * X1 + -11782 * X2 + 19346 * X3 + 70072 * X4 +
-36991 * X5 + 44529 * X6 == 740061)
solver.Add(85176 * X0 + -95332 * X1 + -1268 * X2 + 57898 * X3 + 15883 * X4 +
50547 * X5 + 83287 * X6 == 373854)
solver.Add(-85698 * X0 + 29958 * X1 + 57308 * X2 + 48789 * X3 + -78219 * X4 +
4657 * X5 + 34539 * X6 == 249912)
solver.Add(-67456 * X0 + 84750 * X1 + -51553 * X2 + 21239 * X3 + 81675 * X4 +
-99395 * X5 + -4254 * X6 == 277271)
solver.Add(94016 * X0 + -82071 * X1 + 35961 * X2 + 66597 * X3 + -30705 * X4 +
-44404 * X5 + -38304 * X6 == 25334)
solver.Add(-60301 * X0 + 31227 * X1 + 93951 * X2 + 73889 * X3 + 81526 * X4 +
-72702 * X5 + 68026 * X6 == 1410723)
solver.Add(-16835 * X0 + 47385 * X1 + 97715 * X2 + -12640 * X3 + 69028 * X4 +
76212 * X5 + -81102 * X6 == 1244857)
solver.Add(-43277 * X0 + 43525 * X1 + 92298 * X2 + 58630 * X3 + 92590 * X4 +
-9372 * X5 + -60227 * X6 == 1503588)
solver.Add(-64919 * X0 + 80460 * X1 + 90840 * X2 + -59624 * X3 + -75542 * X4 +
25145 * X5 + -47935 * X6 == 18465)
solver.Add(-45086 * X0 + 51830 * X1 + -4578 * X2 + 96120 * X3 + 21231 * X4 +
97919 * X5 + 65651 * X6 == 1198280)
solver.Add(85268 * X0 + 54180 * X1 + -18810 * X2 + -48219 * X3 + 6013 * X4 +
78169 * X5 + -79785 * X6 == 90614)
solver.Add(8874 * X0 + -58412 * X1 + 73947 * X2 + 17147 * X3 + 62335 * X4 +
16005 * X5 + 8632 * X6 == 752447)
solver.Add(71202 * X0 + -11119 * X1 + 73017 * X2 + -38875 * X3 + -14413 * X4 +
-29234 * X5 + 72370 * X6 == 129768)
solver.Add(1671 * X0 + -34121 * X1 + 10763 * X2 + 80609 * X3 + 42532 * X4 +
93520 * X5 + -33488 * X6 == 915683)
solver.Add(51637 * X0 + 67761 * X1 + 95951 * X2 + 3834 * X3 + -96722 * X4 +
59190 * X5 + 15280 * X6 == 533909)
solver.Add(-16105 * X0 + 62397 * X1 + -6704 * X2 + 43340 * X3 + 95100 * X4 +
-68610 * X5 + 58301 * X6 == 876370)
#
# search and result
#
db = solver.Phase(X, solver.CHOOSE_FIRST_UNBOUND, solver.ASSIGN_MIN_VALUE)
solver.NewSearch(db)
num_solutions = 0
while solver.NextSolution():
num_solutions += 1
print("X:", [X[i].Value() for i in range(n)])
print()
solver.EndSearch()
print()
print("num_solutions:", num_solutions)
print("failures:", solver.Failures())
print("branches:", solver.Branches())
print("WallTime:", solver.WallTime())
main()