题目1457：非常可乐(广度优先遍历BFS)

题目链接：http://ac.jobdu.com/problem.php?pid=1457

详解链接：https://github.com/zpfbuaa/JobduInCPlusPlus

参考代码：

//
//  1457 非常可乐.cpp
//  Jobdu
//
//  Created by PengFei_Zheng on 22/04/2017.
//  Copyright © 2017 PengFei_Zheng. All rights reserved.
//
 
#include <stdio.h>
#include <iostream>
#include <algorithm>
#include <string.h>
#include <cmath>
#include <queue>
#define MAX_SIZE 101
using namespace std;int s, n, m;struct N{int a;int b;int c;int t;
};queue<N> myQueue;
bool visit[MAX_SIZE][MAX_SIZE][MAX_SIZE];void x2y(int &x,int size_x, int &y,int size_y){if(size_y - y >= x){y+=x;x = 0;}else{x -=(size_y-y);y = size_y;}
}int BFS(int s, int n, int m){while(!myQueue.empty()){N nowP = myQueue.front();myQueue.pop();int a, b, c;a = nowP.a;b = nowP.b;c = nowP.c;x2y(a,s,b,n);// a--->bif(visit[a][b][c]==false){visit[a][b][c]=true;N tmp;tmp.a = a;tmp.b = b;tmp.c = c;tmp.t = nowP.t+1;if((a==s/2 && b==s/2) || (a==s/2 &&c==s/2) || (b==s/2 && c==s/2) ) return tmp.t;myQueue.push(tmp);}a = nowP.a;b = nowP.b;c = nowP.c;x2y(a,s,c,m);// a--->cif(visit[a][b][c]==false){visit[a][b][c]=true;N tmp;tmp.a = a;tmp.b = b;tmp.c = c;tmp.t = nowP.t+1;if((a==s/2 && b==s/2) || (a==s/2 &&c==s/2) || (b==s/2 && c==s/2) ) return tmp.t;myQueue.push(tmp);}a = nowP.a;b = nowP.b;c = nowP.c;x2y(b,n,a,s);// b--->aif(visit[a][b][c]==false){visit[a][b][c]=true;N tmp;tmp.a = a;tmp.b = b;tmp.c = c;tmp.t = nowP.t+1;if((a==s/2 && b==s/2) || (a==s/2 &&c==s/2) || (b==s/2 && c==s/2) ) return tmp.t;myQueue.push(tmp);}a = nowP.a;b = nowP.b;c = nowP.c;x2y(b,n,c,m);// b--->cif(visit[a][b][c]==false){visit[a][b][c]=true;N tmp;tmp.a = a;tmp.b = b;tmp.c = c;tmp.t = nowP.t+1;if((a==s/2 && b==s/2) || (a==s/2 &&c==s/2) || (b==s/2 && c==s/2) ) return tmp.t;myQueue.push(tmp);}a = nowP.a;b = nowP.b;c = nowP.c;x2y(c,m,a,s);// c--->aif(visit[a][b][c]==false){visit[a][b][c]=true;N tmp;tmp.a = a;tmp.b = b;tmp.c = c;tmp.t = nowP.t+1;if((a==s/2 && b==s/2) || (a==s/2 &&c==s/2) || (b==s/2 && c==s/2) ) return tmp.t;myQueue.push(tmp);}a = nowP.a;b = nowP.b;c = nowP.c;x2y(c,m,b,n);// c--->bif(visit[a][b][c]==false){visit[a][b][c]=true;N tmp;tmp.a = a;tmp.b = b;tmp.c = c;tmp.t = nowP.t+1;if((a==s/2 && b==s/2) || (a==s/2 &&c==s/2) || (b==s/2 && c==s/2) ) return tmp.t;myQueue.push(tmp);}}return -1;
}int main(){while(scanf("%d%d%d",&s,&n,&m)!=EOF){if(s==0) break;if(s%2==1){printf("NO\n");continue;}for(int i = 0 ; i <= s ; i++){for(int j = 0 ; j <= n ; j++){for(int k = 0 ; k <= m ; k++){visit[i][j][k]=false;}}}while(!myQueue.empty()) myQueue.pop();N tmp;tmp.a = s;tmp.b = tmp.c = tmp.t = 0;myQueue.push(tmp);visit[s][0][0]=true;int ans = BFS(s,n,m);ans == -1 ? printf("NO\n") : printf("%d\n",ans);}
}
/**************************************************************Problem: 1457User: zpfbuaaLanguage: C++Result: AcceptedTime:10 msMemory:2528 kb
****************************************************************/