답안 #621270

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
621270	2022-08-03T16:13:29 Z	PoonYaPat	Lightning Rod (NOI18_lightningrod)	C++14	80 / 100	2000 ms	262144 KB

lightningrod

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

const int MX=10000005;
int n,a[MX],b[MX],pre[MX],pos[MX];
stack<int> st;

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin>>n;
    for (int i=1; i<=n; ++i) {
        int x,y;
        cin>>x>>y;
        a[i]=x-y;
        b[i]=x+y;
    }

    for (int i=1; i<=n; ++i) {
        int idx=i-1;
        while (a[i]<=a[idx] && idx>=1) idx=pre[idx];
        pre[i]=idx;
    }

    for (int i=n; i>=1; --i) {
        int idx=i+1;
        while (b[i]>=b[idx] && idx<=n) idx=pos[idx];
        pos[i]=idx;
    }

    st.push(1);
    for (int i=2; i<=n; ++i) {
            //consider point i
        int k=st.top();
        if (pos[k]<=i) {
                //push rod at point i
            while (!st.empty() && pre[i]<=pre[st.top()]) st.pop();
            st.push(i);
        }
    }
    cout<<st.size();
}

Subtask #1

4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1364 ms	191936 KB	Output is correct
2	Correct	1350 ms	191332 KB	Output is correct
3	Correct	1322 ms	185992 KB	Output is correct

Subtask #2

7.0 / 7.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	340 KB	Output is correct
2	Correct	0 ms	340 KB	Output is correct
3	Correct	0 ms	340 KB	Output is correct
4	Correct	0 ms	340 KB	Output is correct
5	Correct	0 ms	340 KB	Output is correct
6	Correct	1 ms	340 KB	Output is correct
7	Correct	0 ms	340 KB	Output is correct

Subtask #3

12.0 / 12.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	340 KB	Output is correct
2	Correct	0 ms	340 KB	Output is correct
3	Correct	0 ms	340 KB	Output is correct
4	Correct	0 ms	340 KB	Output is correct
5	Correct	0 ms	340 KB	Output is correct
6	Correct	1 ms	340 KB	Output is correct
7	Correct	0 ms	340 KB	Output is correct
8	Correct	1 ms	340 KB	Output is correct
9	Correct	0 ms	340 KB	Output is correct
10	Correct	0 ms	332 KB	Output is correct

Subtask #4

21.0 / 21.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	340 KB	Output is correct
2	Correct	0 ms	340 KB	Output is correct
3	Correct	0 ms	340 KB	Output is correct
4	Correct	0 ms	340 KB	Output is correct
5	Correct	0 ms	340 KB	Output is correct
6	Correct	1 ms	340 KB	Output is correct
7	Correct	0 ms	340 KB	Output is correct
8	Correct	1 ms	340 KB	Output is correct
9	Correct	0 ms	340 KB	Output is correct
10	Correct	0 ms	332 KB	Output is correct
11	Correct	1 ms	340 KB	Output is correct
12	Correct	1 ms	352 KB	Output is correct
13	Correct	1 ms	340 KB	Output is correct

Subtask #5

26.0 / 26.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	340 KB	Output is correct
2	Correct	0 ms	340 KB	Output is correct
3	Correct	0 ms	340 KB	Output is correct
4	Correct	0 ms	340 KB	Output is correct
5	Correct	0 ms	340 KB	Output is correct
6	Correct	1 ms	340 KB	Output is correct
7	Correct	0 ms	340 KB	Output is correct
8	Correct	1 ms	340 KB	Output is correct
9	Correct	0 ms	340 KB	Output is correct
10	Correct	0 ms	332 KB	Output is correct
11	Correct	1 ms	340 KB	Output is correct
12	Correct	1 ms	352 KB	Output is correct
13	Correct	1 ms	340 KB	Output is correct
14	Correct	50 ms	6716 KB	Output is correct
15	Correct	40 ms	6640 KB	Output is correct
16	Correct	38 ms	6216 KB	Output is correct

Subtask #6

10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1422 ms	181792 KB	Output is correct
2	Correct	1504 ms	262144 KB	Output is correct
3	Correct	1439 ms	262144 KB	Output is correct

Subtask #7

0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1364 ms	191936 KB	Output is correct
2	Correct	1350 ms	191332 KB	Output is correct
3	Correct	1322 ms	185992 KB	Output is correct
4	Correct	0 ms	340 KB	Output is correct
5	Correct	0 ms	340 KB	Output is correct
6	Correct	0 ms	340 KB	Output is correct
7	Correct	0 ms	340 KB	Output is correct
8	Correct	0 ms	340 KB	Output is correct
9	Correct	1 ms	340 KB	Output is correct
10	Correct	0 ms	340 KB	Output is correct
11	Correct	1 ms	340 KB	Output is correct
12	Correct	0 ms	340 KB	Output is correct
13	Correct	0 ms	332 KB	Output is correct
14	Correct	1 ms	340 KB	Output is correct
15	Correct	1 ms	352 KB	Output is correct
16	Correct	1 ms	340 KB	Output is correct
17	Correct	50 ms	6716 KB	Output is correct
18	Correct	40 ms	6640 KB	Output is correct
19	Correct	38 ms	6216 KB	Output is correct
20	Correct	1422 ms	181792 KB	Output is correct
21	Correct	1504 ms	262144 KB	Output is correct
22	Correct	1439 ms	262144 KB	Output is correct
23	Correct	1991 ms	262144 KB	Output is correct
24	Execution timed out	2062 ms	262144 KB	Time limit exceeded
25	Halted	0 ms	0 KB	-