Submission #286970

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Source Code Expand

#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <string>
#include <cmath>
#include <algorithm>
#include <vector>
#include <queue>
#include <stack>

using namespace std;

vector<int> way[101];

int hou[101],ans=0,ba=0;

void dfs(int be,int now){
    if(hou[now]){
        ba=0;
    }
    for(int i=0;i<way[now].size();i++){
        if(way[now][i] != be){
            ba++; ans++;
            dfs(now,way[now][i]);
        }
    }
    if(ba){
        ans--;
        ba--;
    }else{
        ans++;
    }
    return;
}


int main(){
    int n,x,from,to;
    
    scanf("%d%d",&n,&x);
    
    for(int i=1;i<=n;i++)
        scanf("%d",&hou[i]);
    
    for(int i=1;i<n;i++){
        scanf("%d%d",&from,&to);
        way[from].push_back(to);
        way[to].push_back(from);
    }
    
    dfs(-1,x);
    
    printf("%d\n",ans-1);
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:40:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
./Main.cpp:43:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
./Main.cpp:46:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]

Judge Result