Jug 倒水问题 ZJU ACM

以前做过一个倒油的问题，和这道很像。

只是这里倒水可以往外倒，也可以往里接。假定外部可以倒出无数，也可以倒进无数。

最近比较忙，还没来得及格式化好输入输出。但算法就是下面这个了。

 

问题的链接

 

import java.util.ArrayList;import java.util.LinkedList;import java.util.Scanner;public class Main {public static void main(String[] args) {int[] input = { 3, 5, 4 };Jug j = new Jug(input);j.RunJug();}}class Jug {private int[] data;private ArrayList<JugState> StateList = new ArrayList<JugState>();public Jug(int[] input) {this.data = input;}public void RunJug() {JugState state = new JugState();state.waterInA = 0;state.waterInB = 0;this.StateList.add(state);FindNext(state);}private void FindNext(JugState state) {if (state.waterInA == data[2] || state.waterInB == data[2]) {this.PrintStateList();System.out.println("success");} else {if (CanPourOut(state)) {PourOut(state);}if (CanPourIn(state)) {PourIn(state);}// Pour A to Bif (state.waterInB < data[1] && state.waterInA > 0) {PourAToB(state);}// Pour B to Aif (state.waterInB > 0 && state.waterInA < data[0]) {PourBToA(state);}}}private boolean ContainState(JugState state){for(int i=0;i<this.StateList.size();i++){if(StateList.get(i).waterInA==state.waterInA&&StateList.get(i).waterInB==state.waterInB)return true;}return false;}private void PourBToA(JugState state) {JugState nextState = new JugState();if (state.waterInB > data[0] - state.waterInA) {nextState.waterInA = data[0];nextState.waterInB = state.waterInB - (data[0] - state.waterInA);} else {nextState.waterInB = 0;nextState.waterInA = state.waterInA + state.waterInB;}if (!ContainState(nextState)) {this.StateList.add(nextState);FindNext(nextState);this.StateList.remove(nextState);}}private void PourAToB(JugState state) {JugState nextState = new JugState();if (state.waterInA > data[1] - state.waterInB) {nextState.waterInB = data[1];nextState.waterInA = state.waterInA - (data[1] - state.waterInB);} else {nextState.waterInA = 0;nextState.waterInB = state.waterInB + state.waterInA;}if (!ContainState(nextState)) {this.StateList.add(nextState);FindNext(nextState);this.StateList.remove(nextState);}}private void PourIn(JugState state) {JugState nextState = new JugState();if (state.waterInA < data[0]) {nextState.waterInA = data[0];nextState.waterInB = state.waterInB;if (!ContainState(nextState)) {this.StateList.add(nextState);FindNext(nextState);this.StateList.remove(nextState);}}if (state.waterInB < data[1]) {nextState.waterInA = state.waterInA;nextState.waterInB = data[1];if (!ContainState(nextState)) {this.StateList.add(nextState);FindNext(nextState);this.StateList.remove(nextState);}}}private boolean CanPourIn(JugState state) {if (state.waterInA < data[0] || state.waterInB < data[1])return true;return false;}private void PourOut(JugState state) {JugState nextState = new JugState();if (state.waterInA > 0) {nextState.waterInA = 0;nextState.waterInB = state.waterInB;if (!ContainState(nextState)) {this.StateList.add(nextState);FindNext(nextState);this.StateList.remove(nextState);}}if (state.waterInB > 0) {nextState.waterInA = state.waterInA;nextState.waterInB = 0;if (!ContainState(nextState)) {this.StateList.add(nextState);FindNext(nextState);this.StateList.remove(nextState);}}}private boolean CanPourOut(JugState state) {if (state.waterInA > 0 || state.waterInB > 0)return true;return false;}public void PrintStateList(){for(int i=0;i<this.StateList.size();i++){System.out.println(this.StateList.get(i).waterInA+" , "+this.StateList.get(i).waterInB);}}public void PrintArray() {for (int i = 0; i < this.data.length; i++) {System.out.print(this.data[i]);}}}class JugState {int waterInA = 0;int waterInB = 0;}