Submission #782038

#	Time	Username	Problem	Language	Result	Execution time	Memory
782038		VadimK	Event Hopping (BOI22_events)	C++17	0 / 100	265 ms	6056 KiB

events

#include <bits/stdc++.h>
using namespace std;
struct event
{
    int s;
    int f;
    int num;
};
bool cmp (event a, event b)
{
    if (a.f==b.f) return a.s<=b.s;
    return a.f<b.f;
}
int main() {
    int n,q;
    cin>>n>>q;
    event arr[n+1];
    int p[n+1];
    for (int i=1; i<=n; i++)
        cin>>arr[i].s>>arr[i].f;
     for (int i=1; i<=n; i++)
        arr[i].num=i;
    sort (arr+1,arr+n+1,cmp);
     for (int i=1; i<=n; i++)
        p[arr[i].num]=i;
    int ori=1,start[n+1];
    start[1]=1;
     for (int i=1; i<n; i++)
        {
            if (arr[i+1].s<=arr[i].f&&arr[i].f<=arr[i+1].f) start[i+1]=ori;
            else {ori=i+1; start[i+1]=ori;}
        }
    while (q--)
    {
        int a,b;
        cin>>a>>b;
        a=p[a]; b=p[b];
        if (start[a]==start[b]&&a<=b) cout<<abs(a-b);
        else cout<<"impossible";
        cout<<endl;
    }
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30