Submission #1248390

#	Time	Username	Problem	Language	Result	Execution time	Memory
1248390		avohado	Strange Device (APIO19_strange_device)	C++20	10 / 100	295 ms	32560 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
#define mod 1000000007
#define maxn 1090005
#define f first
#define s second
#define ll long long
#define pb(x) push_back(x)
void solve(){
    int n;
    long long A, B, mx;
    cin >> n >> A >> B;
    vector<pair<ll, ll>> v;
    long long a[n], b[n];
    for(int i=0; i<n; i++){
        cin >> a[i] >> b[i];
    }
    if((b[n-1]+1)/A<B){
        mx=b[n-1]+1;
    }else{
        mx=A*B;
    }
    for(int i=0; i<n; i++){
        if(b[i]-mx>=a[i]-1){
            cout << mx;return;
        }
        if(a[i]%mx>b[i]%mx){
            v.push_back({0, b[i]%mx});v.push_back({a[i]%mx, mx-1});
        }else{
            v.push_back({a[i]%mx, b[i]%mx});
        }
    }
    long long ans=0, l=0;
    sort(v.begin(), v.end());
    for(auto i:v){
        l=max(l, i.f);
        ans+=max(i.s-l+1, 0ll);
        l=max(l, i.s+1);
    }
    cout << ans;
}
int main(){
    cin.tie(nullptr)->sync_with_stdio(0);
    int t=1;
    //cin >> t;
    while(t--){
        solve();
        cout << "\n";
    }
    return 0;
}

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