Submission #979299

#	Time	Username	Problem	Language	Result	Execution time	Memory
979299		nnin	Strange Device (APIO19_strange_device)	C++17	100 / 100	386 ms	54476 KiB

strange_device

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

int n;
ll A, B;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin>>n>>A>>B;
    ll g = __gcd(A, B+1);
    A /= g;
    vector<pii> v;
    bool all = 0;
    for(int i=0;i<n;i++) {
        ll l, r;
        cin>>l>>r;
        if(all) continue;
        ll x = l/A;
        x /= B;
        ll y = r/A;
        y /= B;
        if(x==0 && y==0) {
            v.push_back({l, r});
        } else if(x==y) {
            v.push_back({l%(A*B), r%(A*B)});
        } else if(x+1==y) {
            v.push_back({l%(A*B), (A*B)-1});
            v.push_back({0, r%(A*B)});
        } else {
            all = 1;
        }
    }
    if(all) {
        cout<<A*B;
        return 0;
    }
    sort(v.begin(), v.end());
    ll ct = 0, last = -1;
    for(int i=0;i<v.size();i++) {
        if(last>=v[i].s) continue;
        if(last<v[i].f) last = v[i].f-1;
        ct += v[i].s-last;
        last = v[i].s;
    }
    cout<<ct;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:44:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |     for(int i=0;i<v.size();i++) {
      |                 ~^~~~~~~~~

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