이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
#define pb push_back
#define szof(s) (int)s.size()
#define all(s) s.begin(), s.end()
#define fastInp ios_base::sync_with_stdio(0); cin.tie(0);
#define pii pair<int, int>
#define fr first
#define sc second
//#define int long long
using namespace std;
const int MAXN = (int)1e6 + 6;
signed main() {
fastInp;
int n, a, b;
cin >> n >> a >> b;
set <pii> st;
for (int i = 1; i <= n; i++) {
int l, r;
cin >> l >> r;
for (int t = l; t <= r; t++) {
st.insert({(t + (t / b)) % a, t % b});
}
}
cout << szof(st) << endl;
}
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