Submission #696324

#	Time	Username	Problem	Language	Result	Execution time	Memory
696324		Cross_Ratio	Bread First Search (CCO21_day2problem2)	C++14	0 / 25	7 ms	9936 KiB

Main

#include <bits/stdc++.h>
using namespace std;
int B[200005];
vector<int> adj[200005];
signed main() {
    cin.sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int N, M;
    cin >> N >> M;
    int i, j;
    for(i=1;i<=N;i++) B[i] = i;
    for(i=0;i<M;i++) {
        int a, b;
        cin >> a >> b;
        if(a > b) swap(a, b);
        B[a] = max(B[a], b);
        adj[b].push_back(a);
    }
    int ans = 0;
    int l = 1, r = 2;
    while(r != N+1) {
        int mi = 1e9;
        for(i=l;i<r;i++) {
            mi = min(mi, B[i]);
        }
        if(mi == r - 1) mi++;
        int r2 = mi + 1;
        for(i=r;i<r2;i++) {
            if(adj[i].size()==0) ans++;
        }
        l = r, r = r2;
    }
    cout << ans;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:11:12: warning: unused variable 'j' [-Wunused-variable]
   11 |     int i, j;
      |            ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 6
• Subtask 3: 0 / 14