Submission #32806181

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

#define rep(i,a,n) for (int i=a;i<n;i++)
#define per(i,a,n) for (int i=n;i-->(int)a;)
#define pb push_back
const double pi = acos(-1.0);

int read(){int r;scanf("%intd",&r);return r;} // read
int n;
int m;

char s[200010];
pair<int,int> ab[200010];

vector<array<int,3>> u2[200010]; // {v, ab idx, '0','1'}

bool vis[200010];

void dfs(int u){
  vis[u] = true;
  for(auto [v,i,o]:u2[u]){
    if(s[i])continue; // 边处理过
    s[i] = (char)o;
    if(!vis[v]) dfs(v);
  }
}


int main(){
  n = read();
  m = read();
  rep(i,0,m) ab[i].first = read();
  rep(i,0,m){
    int a = ab[i].first;
    int b = ab[i].second = read();
    u2[a].pb({b,i,(int)'0'});
    u2[b].pb({a,i,(int)'1'});
  }
  rep(i,1,n+1){
    if(vis[i])continue;
    dfs(i);
  }
  rep(i,0,m){
    if(!s[i]) s[i] = '0';
  }
  printf("%s\n",s);
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int read()’:
./Main.cpp:9:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
    9 | int read(){int r;scanf("%intd",&r);return r;} // read
      |                  ~~~~~^~~~~~~~~~~~

Judge Result