1400. Cellular Characters 夜

http://acm.timus.ru/problem.aspx?space=1&num=1400

简单floyd 不过让我不明白的是 为什么 c++可以过 但是java却过不了呢 郁闷

代码：

#include<iostream>
#include<stdio.h>
#include<string.h>
#include<math.h>
#include<algorithm>
#include<vector>
#include<set>
#include<map>
#include<string>
#include<queue>
#include<stack>
#include <iomanip>
using namespace std;
#define LL long long
const int INF=0x3f3f3f3f;
//priority_queue<int,vector<int>,greater<int> >qt;
const int N=505;
int dist[N][N];
int main()
{
    //freopen("data.in","r",stdin);
    int n,m;
    cin>>n>>m;
    for(int i=0;i<n;++i)
    for(int j=0;j<n;++j)
    dist[i][j]=INF;
    for(int i=0;i<n;++i)
    {
        int l=(i-1+n)%n;
        int r=(i+1)%n;
        dist[i][i]=min(dist[i][i], 0);
        dist[i][l]=min(dist[i][l], 1);
        dist[i][r]=min(dist[i][l], 1);
        if(i-m>=0)
        {
            dist[i][i-m]=min(dist[i][l], 1);
        }
        if(i+m<n)
        {
            dist[i][i+m]=min(dist[i][l], 1);
        }
    }
    for(int l=0;l<n;++l){
        for(int i=0;i<n;++i){
            for(int j=0;j<n;++j){
                if(dist[i][j]>dist[i][l]+dist[l][j]){
                    dist[i][j]=dist[i][l]+dist[l][j];
                }
            }
        }
    }
    double Mean=(double)INF;
    int k=-1;
    for(int i=0;i<n;++i){
        double tmp=0.0;
        for(int j=0;j<n;++j){
            tmp=tmp+(double)dist[j][i];
        }
        if(tmp/n<Mean){
            Mean=tmp/n;
            k=i;
        }
    }
    printf("Mean = %.2f\n",Mean);
    for(int i=0;i<n;++i)
    {
        cout<<dist[i][k];
        if(i==n-1||(i+1)%m==0)
        cout<<endl;
        else
        cout<<" ";
    }
    //cin>>n;
    return 0;
}