#include<bits/stdc++.h> using namespace std; typedef long long int lld; int main(){ int n,m; scanf("%d %d",&n,&m); int victory[n]; int fail[n]; for(int i=0;i<n;i++){ victory[i]=0; fail[i]=0; } for(int i=0;i<m;i++){ int x,y; scanf("%d %d",&x,&y); x--;y--; victory[x]++; fail[y]++; } for(int i=0;i<n;i++){ if(victory[i]>0 || (victory[i]+fail[i]==0)){ cout<<1; }else cout<<0; }cout<<endl; return 0; }

wand.cpp: In function 'int main()':
wand.cpp:8:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&n,&m);
   ~~~~~^~~~~~~~~~~~~~~
wand.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&x,&y);
     ~~~~~^~~~~~~~~~~~~~~