请问这道题哪里不对了 CE了无数次


#include<iostream>
#include<string>
#include<map>
#include<algorithm>
#include<stdio>
using namespace std;

int main (){

    map<string,int> my_map;
    map<string,int>::iterator iter;
    float mile;
    int n;
    int m;
    float c;
    float w[101][101];
    float dist[101];
    bool s[101];
    string str1,str2;
    
    for(int i=0;i<101;i++){
        s[i]=false;
        for(int j=0;j<101;j++){
            w[i][j]=9999.9;
        }
    }

    cin>>mile;
    cin>>n;
    
    for(int i=1;i<=n;i++){
        cin>>str1;
        my_map[str1]=i;
    }
    
    cin>>m;
    
    for(int i=0;i<m;i++){
        cin>>str1>>str2>>c;
        iter=my_map.find(str1);
        int a,b;
        a=iter->second;
        iter=my_map.find(str2);
        b=iter->second;
        if(w[a][b]>c)w[a][b]=w[b][a]=c;
    }
    
    //init
    s[1]=true;dist[1]=0;
    for(int i=2;i<=n;i++){dist[i]=w[1][i];}
    float len=0.0;
    //start
    for(int k=1;k<n;k++){
    float min=9999.9;
    int u;
    for(int i=2;i<=n;i++){
        if(!s[i]&&dist[i]<min){min=dist[i];u=i;}
    }
    s[u]=true;
    
    len+=min;
    min=9999.9;
    for(int i=2;i<=n;i++){
        if(!s[i]&&dist[i]>w[u][i])dist[i]=w[u][i];
    }
    }
    
    if(len>mile)cout<<"Not enough cable"<<endl;
    else cout<<"Need "<<len<<" miles of cable"<<endl;
    system("pause");
    return 0;
}

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