92 lines
2.9 KiB
Java
92 lines
2.9 KiB
Java
// Copyright 2011 Hakan Kjellerstrand hakank@gmail.com
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import java.io.*;
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import java.util.*;
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import java.text.*;
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import com.google.ortools.constraintsolver.DecisionBuilder;
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import com.google.ortools.constraintsolver.IntVar;
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import com.google.ortools.constraintsolver.Solver;
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public class SendMoreMoney {
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static {
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System.loadLibrary("jniortools");
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}
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/**
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*
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* Solves the SEND+MORE=MONEY problem.
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*
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*/
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private static void solve() {
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int base = 10;
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Solver solver = new Solver("SendMoreMoney");
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IntVar s = solver.makeIntVar(0, base - 1, "s");
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IntVar e = solver.makeIntVar(0, base - 1, "e");
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IntVar n = solver.makeIntVar(0, base - 1, "n");
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IntVar d = solver.makeIntVar(0, base - 1, "d");
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IntVar m = solver.makeIntVar(0, base - 1, "m");
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IntVar o = solver.makeIntVar(0, base - 1, "o");
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IntVar r = solver.makeIntVar(0, base - 1, "r");
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IntVar y = solver.makeIntVar(0, base - 1, "y");
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IntVar[] x = {s,e,n,d,m,o,r,y};
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IntVar[] eq = {s,e,n,d, m,o,r,e, m,o,n,e,y};
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int[] coeffs = {1000, 100, 10, 1, // S E N D +
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1000, 100, 10, 1, // M O R E
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-10000, -1000, -100, -10, -1 // == M O N E Y
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};
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solver.addConstraint(solver.makeScalProdEquality(eq, coeffs, 0));
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// alternative:
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solver.addConstraint(
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solver.makeScalProdEquality(new IntVar[] {s,e,n,d, m,o,r,e, m,o,n,e,y},
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coeffs, 0));
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// s > 0
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solver.addConstraint(solver.makeGreater(s, 0));
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// m > 0
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solver.addConstraint(solver.makeGreater(m, 0));
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solver.addConstraint(solver.makeAllDifferent(x));
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DecisionBuilder db = solver.makePhase(x,
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solver.INT_VAR_DEFAULT,
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solver.INT_VALUE_DEFAULT);
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solver.newSearch(db);
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while (solver.nextSolution()) {
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for(int i = 0; i < 8; i++) {
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System.out.print(x[i].toString() + " ");
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}
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System.out.println();
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}
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solver.endSearch();
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// Statistics
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System.out.println();
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System.out.println("Solutions: " + solver.solutions());
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System.out.println("Failures: " + solver.failures());
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System.out.println("Branches: " + solver.branches());
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System.out.println("Wall time: " + solver.wallTime() + "ms");
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}
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public static void main(String[] args) throws Exception {
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SendMoreMoney.solve();
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}
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}
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