Submission #744208

#	Time	Username	Problem	Language	Result	Execution time	Memory
744208		iamporrrrrrrrr	Strange Device (APIO19_strange_device)	C++14	100 / 100	568 ms	37724 KiB

strange_device

#include <bits/stdc++.h>
#define int long long
using namespace std;
set<int> s;
vector<pair<int,int>> v;
int g(int a,int b){
    if(b==0) return a;
    return g(b,a%b);
}
int st[1000010],ed[1000010];
signed main()
{
    ios::sync_with_stdio(0),cin.tie(0);
    int n,a,b;
    int sum=0;
    cin>>n>>a>>b;
    int dmod = g(max(a,b+1),min(a,b+1));
    for(int i=1;i<=n;i++){
        cin>>st[i]>>ed[i];
        sum+=ed[i]-st[i]+1;
    }
    if((double)(ed[n]/(a/dmod))<=(double)b){
        cout<<sum;
        return 0;
    }
    int mod=a/dmod*b;
    //cout<<mod<<' ';
    for(int i=1;i<=n;i++){
        int x=st[i];
        int y=ed[i];
        if(y-x>mod){
            cout<<mod;
            return 0;
        }
        x%=mod;
        y%=mod;
        if(y>=x){
            v.push_back({x,y});
        }
        else v.push_back({x,mod-1}),v.push_back({0,y});
    }
    sort(v.begin(),v.end());
    int rr=-1,ans=0;
    for(int i=0;i<v.size();i++){
        int l=v[i].first;
        int r=v[i].second;
        if(l>rr){
            ans+=(r-l+1);
            rr=r;
        }
        else if(l<=rr&&r>rr){
            ans+=(r-rr);
            rr=r;
        }
    }
    cout<<ans;
    return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:44:18: 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]
   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