Submission #1817870

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Source Code Expand

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

typedef long long ll;
#define REP(i,n) for(int i=0,_n=(int)(n);i<_n;++i)
#define ALL(v) (v).begin(),(v).end()
template<class T1,class T2>ostream& operator<<(ostream& os,const pair<T1,T2>&a){return os<<"("<<a.first<<","<<a.second<< ")";}
template<class T>void pv(T a,T b){for(T i=a;i!=b;++i)cout<<(*i)<<" ";cout<<endl;}
template<class T>bool chmin(T&a,const T&b){return a>b?(a=b,1):0;}
template<class T>bool chmax(T&a,const T&b){return a<b?(a=b,1):0;}

int nextInt() { int x; scanf("%d", &x); return x;}

const int MAX_M = 100005;
const int MAX_N = 300005;

int acc[MAX_N];
ll ex[MAX_N];
bool ok[MAX_M];

int main2() {
  memset(acc, 0, sizeof(acc));
  memset(ex, 0, sizeof(ex));
  int N = nextInt();
  int M = nextInt();
  REP(i, M) {
    int A = nextInt() - 1;
    int B = nextInt();
    acc[A]++;
    acc[B]--;
    ex[A] += (i+1);
    ex[B] -= (i+1);
  }
  REP(i, N) acc[i+1] += acc[i];
  REP(i, N) ex[i+1] += ex[i];
  
  REP(i, M) ok[i] = true;
  REP(i, N) if (acc[i] == 1) {
    ok[ex[i]-1] = false;
  }
  int size = 0;
  REP(i, M) if (ok[i]) size++;
  printf("%d\n", size);
  REP(i, M) if (ok[i]) printf("%d\n", i+1);


  return 0;
}

int main() {
  for (;!cin.eof();cin>>ws) main2();
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int nextInt()’:
./Main.cpp:12:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
 int nextInt() { int x; scanf("%d", &x); return x;}
                                       ^

Judge Result