Submission #810248

#	Time	Username	Problem	Language	Result	Execution time	Memory
810248		peteza	Strange Device (APIO19_strange_device)	C++14	0 / 100	398 ms	36940 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;

int n;
long long a, b, mod;
long long l, r, last=0, sum = 0;
vector<pair<long long, bool>> vec;
int ctr = 0;

int main() {
    cin.tie(0) -> sync_with_stdio(0);
    cin >> n >> a >> b; a /= __gcd(a, b);
    if(a >= 4e18/b) mod = 4e18;
    else mod = a*b;
    while(n--) {
        cin >> l >> r;
        if(r-l+1 >= mod) {
            cout << mod;
            return 0;
        }
        l %= mod; r %= mod;
        if(l <= r) vec.emplace_back(l, 0), vec.emplace_back(r+1, 1);
        else vec.emplace_back(l, 0), vec.emplace_back(mod, 1), vec.emplace_back(0, 0), vec.emplace_back(r+1, 1);
    }
    sort(vec.begin(), vec.end());
    for(auto e:vec) {
        sum += min(ctr, 1) * (e.first-last);
        if(e.second) ctr--;
        else ctr++;
        last = e.first;
    }
    cout << sum;
}

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