Submission #907441

#	Time	Username	Problem	Language	Result	Execution time	Memory
907441		Itamar	Strange Device (APIO19_strange_device)	C++14	100 / 100	608 ms	70488 KiB

strange_device

//#include "tree_contest.h"
#include <iostream>
using namespace std;
#include <vector>
#define vi vector<int>
#define ll long long
//#define ll __int128 
#include <algorithm>
#include <set>
#include <string>
#include <bitset>
#include <cmath>
#include <math.h>
#define pll pair<ll,ll>
#define vll vector<ll>
#define pi pair<int,int>
#include <map>
#include <queue>
#define x first
#define y second
#define pd pair<double,double>
ll gcd(ll a, ll b) {
    if (a > b)swap(a, b);
    if (a == 0)return b;
    return gcd(b % a, a);
}
int main() {
    ll n,a, b;
    cin >> n>>a >> b;
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    ll m = (a / gcd(a, b + 1)) * b;
    vector<pll> seg;
    for (int i = 0; i < n; i++) {
        ll l, r;
        cin >> l >> r;
        if (2 + (l / m) <= (r / m)) {
            cout << m;
            return 0;
        }
        if (l / m < r / m) {
            seg.push_back({ l % m,1 });
            seg.push_back({ m ,-1 });
            //seg.push_back({ l % m,m-1 });
            //seg.push_back({ 0,r % m });
            seg.push_back({ 0,1 });
            seg.push_back({ 1+(r % m),-1 });
        }
        else {
            seg.push_back({ l % m,1 });
            seg.push_back({ 1+(r % m),-1});
            //seg.push_back({ l % m,r % m });
        }
    }
    sort(seg.begin(), seg.end());
    int sum = 0;
    ll ans = 0;
    seg.push_back({ m,0 });
    for (int i = 0; i < seg.size(); i++) {
        if (sum) {
            ans += seg[i].first - seg[i - 1].first;
        }
        sum += seg[i].second;
    }
    cout << ans;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:58:23: 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]
   58 |     for (int i = 0; i < seg.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