Submission

Score: 0

User: limsan20122

Problemset: ห้องสมุดเมือง 3M

Language: cpp

Time: 0.002 second

Submitted On: 2025-10-04 11:03:41

#include <iostream>
#include <vector>
#include <set>
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    long long int x=0;
    long long int y=0;
    long long int z=0;
    set<int>a;
    vector<int>b;
    cin >> x;
    for(int i=0;i<x;i++){
        cin >> y >> z;
        for(int i=y;i<z;i++){
            a.insert(i);
        }
    }
    for(int i : a){
        b.push_back(i);
    }
    if(b.size()%2==0) cout << b.size()/2;
    else cout << (b.size()/2)-1;
    return 0;
}