Submission #2501769

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Source Code Expand

#include<stdio.h>
#include<string.h>
#include<bits/stdc++.h>
using namespace std;
int uf[(int)1e5+1];
int p[(int)1e5+1];
vector<int>edge[(int)1e5+1];
vector<int>cc[(int)1e5+1];
vector<int>dc[(int)1e5+1];
bool vst[(int)1e5+1];
void dfs(int k,int id){
    cc[id].push_back(k);
    dc[id].push_back(p[k]);
    vst[k]=true;
    int l=edge[k].size();
    for(int i=0;i<l;i++){
        if(!vst[edge[k][i]])dfs(edge[k][i],id);
    }
}
int main(){
    int n;
    scanf("%d",&n);
    int m;
    scanf("%d",&m);
    for(int i=0;i<n;i++){
        scanf("%d",&p[i]);
        p[i]--;
    }
    int x,y;
    for(int i=0;i<m;i++){
        scanf("%d%d",&x,&y);
        x--;
        y--;
        edge[x].push_back(y);
        edge[y].push_back(x);
    }
    int id=0;
    for(int i=0;i<n;i++){
        if(!vst[i]){
            dfs(i,id);
            id++;
        }
    }
    int ans=0;
    for(int i=0;i<id;i++){
        sort(cc[i].begin(),cc[i].end());
        sort(dc[i].begin(),dc[i].end());
        int l=cc[i].size();
        int j1=0,j2=0;
        while(j1<l&&j2<l){
            if(cc[i][j1]>dc[i][j2]){
                j2++;
                continue;
            }
            else if(cc[i][j1]<dc[i][j2]){
                j1++;
                continue;
            }
            else{
                ans++;
                j2++;
                j1++;
            }
        }
    }
    printf("%d\n",ans);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:22:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
                   ^
./Main.cpp:24:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&m);
                   ^
./Main.cpp:26:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&p[i]);
                          ^
./Main.cpp:31:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&x,&y);
                            ^

Judge Result