Submission #1358069

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
int par[100010];
bool c[100010];
int r(int x){ return x==par[x]?x:(par[x]=r(par[x])); }
int main(){
int n, m;
scanf("%d%d", &n, &m);
for(int i=1; i<=n; ++i) par[i]=i;
for(int i=1; i<=m; ++i){
int a, b; scanf("%d%d",&a,&b);
par[r(a)]=r(b);
}
int ans=0;
for(int i=1; i<=n; ++i) if(!c[r(i)]) c[r(i)]=1, ++ans;
printf("%d\n", n-1-ans);
return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:8:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d%d", &n, &m);
                      ^
./Main.cpp:11:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 int a, b; scanf("%d%d",&a,&b);
                              ^

Judge Result