Submission #782506

#	Time	Username	Problem	Language	Result	Execution time	Memory
782506		kebine	Strange Device (APIO19_strange_device)	C++17	35 / 100	363 ms	17556 KiB

strange_device

//         }
//     }
//     return 0;
// }

#include <bits/stdc++.h>
using namespace std;
 
#define v          vector
#define int        long long
#define all(a)     (a).begin(), (a).end()
#define pb         push_back
#define mk         make_pair
#define pii        pair<int, int>
#define ff         first
#define ss         second
#define inp_v(vec) for (auto &i : vec) cin >> i;
#define prt_v(vec) for (auto i : vec) cout << i << endl;
#define MS(x)     memset(x, 0, sizeof(x))
#define gcd(a,b)   __gcd(a, b);
#define lcm(a,b)   (a*(b/gcd(a,b)))
#define lb         lower_bound
#define ub         upper_bound
bool chmin(int &a, int b){return b<a?a=b, true:false;}
bool chmax(int &a, int b){return b>a?a=b, true:false;}
// bool comp(const pair<int, int>&a, const pair<int int>&b){
//     return a.second<b.second;
// }
signed main(){
    ios_base::sync_with_stdio(false); cin.tie(0);
    int N, a, b;cin>>N>>a>>b;
    int cycle=a*b/(__gcd(a, b+1));
    vector<pair<int, int>>segment;
    vector<pair<int, int>>seg;
    bool flag=false;
    for(int i=0;i<N;i++){
        int x, y;cin>>x>>y;
        if(y-x+1>=cycle){
            flag=true;
        }
        if(y>=cycle){
            // cout<<i<<" "<<x<<" "<<cycle<<" "<<y%cycle<<endl;
            if(x>=cycle){
                if(y/cycle>x/cycle){
                    segment.push_back({x%cycle, cycle-1});
                    segment.push_back({0, y%cycle});
                }
                else segment.push_back({x%cycle, y%cycle});
                // segment.push_back({0, y%cycle});
            }
            else{
                segment.push_back({x, cycle-1});
                segment.push_back({0, y%cycle});
            }
        }
        else{
            segment.push_back({x, y});
        }
    }
    sort(segment.begin(), segment.end());
    int curl=-1, curr=-1;
    int ans=0;
    // cout<<cycle<<endl;
    for(int i=0;i<segment.size();i++){
        // cout<<segment[i].first<<" "<<segment[i].second<<endl;
        if(curr>segment[i].second){
            continue;
        }
        else{
            curl=max(curr+1, segment[i].first);
            curr=segment[i].second;
            ans+=curr-curl+1;
        }
    }
    if(flag)cout<<cycle<<endl;
    else cout<<ans<<endl;

    return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:64:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |     for(int i=0;i<segment.size();i++){
      |                 ~^~~~~~~~~~~~~~~

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