Submission #723188

#	Time	Username	Problem	Language	Result	Execution time	Memory
723188		culver0412	Strange Device (APIO19_strange_device)	C++17	100 / 100	1659 ms	28748 KiB

strange_device

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

void bruh(int n){
    long long int ans=0;
    for(int i=0;i<n;i++){
        long long int l,r;
        cin >> l >> r;
        ans+=(r-l+1);
    }
    cout << ans << endl;
    return;
}

int main(){
    long long int n,a,b;
    cin >> n >> a >> b;
    long long int x=a/gcd(a,b+1);
    if(b<1e18*1.0/x){
        x*=b;
    }
    else{
        bruh(n);
        return 0;
    }
    vector<pair<long long int,long long int>> ranges;
    for(int i=0;i<n;i++){
        long long int l,r;
        cin >> l >> r;
        if(r-l+1>=x){
            cout << x << endl;
            return 0;
        }
        l%=x;
        r%=x;
        if(l<=r){
            ranges.push_back({l,r});
        }
        else{
            ranges.push_back({0,r});
            ranges.push_back({l,x-1});
        }
    }
    sort(ranges.begin(),ranges.end());
    long long int curl=ranges[0].first,curr=ranges[0].second,ans=0;
    for(int i=1;i<ranges.size();i++){
        pair<long long int,long long int> range=ranges[i];
        if(curr<range.first){
            ans+=(curr-curl+1);
            curl=range.first;
            curr=range.second;
        }
        else{
            curr=max(curr,range.second);
        }
    }
    ans+=(curr-curl+1);
    cout << ans << endl;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:46:18: 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]
   46 |     for(int i=1;i<ranges.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