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Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 30371 Accepted Submission(s): 11380


#include <iostream>
#include <stdio.h>
#include <string.h>
#include <queue>
#define N 51
using namespace std;
struct node{
int x,y,z,time;
};
int Map[N][N][N];
bool vis[N][N][N];
int dir[6][3] = {{0,0,1},{0,1,0},{1,0,0},{-1,0,0},{0,-1,0},{0,0,-1}}; //上下左右前后六个方向
int A,B,C,T;
bool check(int x,int y,int z){
if(x<0||x>A-1||y<0||y>B-1||z<0||z>C-1) return true;
if(vis[x][y][z]||Map[x][y][z]==1) return true;
return false;
}
void bfs(){
queue<node> q;
node t,next;
t.x=0;
t.y=0;
t.z=0;
t.time=0;
vis[t.x][t.y][t.z]=true;
q.push(t);
while(!q.empty()){
t = q.front();
q.pop();
if(t.time>T){ //不加这句会超时
printf("-1\n");
return;
}
if(t.x==A-1&&t.y==B-1&&t.z==C-1&&t.time<=T){
printf("%d\n",t.time);
return;
}
for(int i=0;i<6;i++){
next.x = t.x+dir[i][0];
next.y = t.y+dir[i][1];
next.z = t.z+dir[i][2];
next.time = t.time+1;
if(check(next.x,next.y,next.z)) continue;
q.push(next);
vis[next.x][next.y][next.z]=true;
}
}
printf("-1\n");
}
int main()
{
int tcase;
scanf("%d",&tcase);
while(tcase--){
memset(vis,false,sizeof(vis));
memset(Map,0,sizeof(Map));
scanf("%d%d%d%d",&A,&B,&C,&T);
for(int i=0;i<A;i++){
for(int j=0;j<B;j++){
for(int k=0;k<C;k++){
scanf("%d",&Map[i][j][k]);
}
}
}
bfs();
}
return 0;
}
java果断超时,附超时代码

import java.util.LinkedList;
import java.util.Queue;
import java.util.Scanner;
public class Main {
static boolean[][][] vis;
static int[][][] map;
static int[][] dir = {{1,0,0},{-1,0,0},{0,1,0},{0,-1,0},{0,0,1},{0,0,-1}};
static int A,B,C,T;
static class node{
int x,y,z,time;
public node(int x,int y,int z,int time){
this.x=x;
this.y=y;
this.z=z;
this.time=time;
}
}
public static void main(String[] args) {
Scanner sc =new Scanner(System.in);
int tcase = sc.nextInt();
while(tcase-->0){
A=sc.nextInt();
B=sc.nextInt();
C=sc.nextInt();
T=sc.nextInt();
map = new int[A][B][C];
vis = new boolean[A][B][C];
for(int i=0;i<A;i++){
for(int j=0;j<B;j++){
for(int k=0;k<C;k++)
map[i][j][k]=sc.nextInt();
}
}
}
BFS();
}
private static void BFS() {
Queue<node> q =new LinkedList<node>();
vis[0][0][0]=true;
q.add(new node(0,0,0,0));
while(!q.isEmpty()){
node t = q.remove();
if(t.time>T) {
System.out.println(-1);
return;
}
if(t.x==A-1&&t.y==B-1&&t.z==C-1&&t.time<=T){
System.out.println(t.time);
return;
}
for(int i=0;i<6;i++){
int x = t.x+dir[i][0];
int y =t.y+dir[i][1];
int z = t.z +dir[i][2];
int time = t.time+1;
if(check(x,y,z)) continue;
q.add(new node(x,y,z,time));
vis[x][y][z]=true;
}
}
System.out.println(-1);
}
private static boolean check(int x, int y, int z) {
if(x<0||x>A-1||y<0||y>B-1||z<0||z>C-1) return true;
if(vis[x][y][z]||map[x][y][z]==1) return true;
return false;
}
}
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原文地址:http://www.cnblogs.com/liyinggang/p/5040267.html