Submission #663038

#	Time	Username	Problem	Language	Result	Execution time	Memory
663038		Ai7081	Strange Device (APIO19_strange_device)	C++17	65 / 100	649 ms	82100 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<ll, ll>

const int N = 1e6 + 5;

ll n, a, b, loop, l, r;
set<pii> s;

ll gcd(ll c1, ll c2) {
    if (!(max(c1,c2)%min(c1,c2))) return min(c1, c2);
    return gcd(min(c1,c2), max(c1,c2)%min(c1,c2));
}

int main() {
    ios_base::sync_with_stdio(false); cin.tie(0);
    cin >> n >> a >> b;
    loop = a*b/gcd(a,b+1);
    while (n--) {
        cin >> l >> r, l%=loop, r%=loop;
        if (l>r) s.insert({0,r}), s.insert({l,loop-1});
        else s.insert({l,r});
    }
    auto it2=s.begin(), it1=it2++;
    while (it2!=s.end()) {
        if (it1->second >= it2->first) {
            pii in = {it1->first, max(it1->second, it2->second)};
            it1=s.erase(it1), it1=s.erase(it1);
            it2=s.insert(in).first;
        }
        it1=it2++;
    }
    ll out=0;
    for (auto [x,y]:s) out += y-x+1;
    cout << out;
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 20 / 20
• Subtask 7: 20 / 20
• Subtask 8: 0 / 30