Submission

Score: 20

User: lazybw_

Problemset: ห้องสมุดเมือง 3M

Language: cpp

Time: 0.002 second

Submitted On: 2025-07-05 11:31:06

#include <bits/stdc++.h>

using namespace std;
using ll = long double;
#define fll(x) for(ll i = 0; i < x; i++)

int main() {
    ios::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    ll n; cin>>n;
    vector<ll> v;
    fll(n) {
        ll l, r; cin>>l>>r;
        v.push_back((l+r-1)/2);
    }
    cout<<floor(accumulate(v.begin(), v.end(), 0)/n);
    return 0;
}