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Submission #417982

# Submission time Handle Problem Language Result Execution time Memory
417982 2021-06-04T18:15:47 Z gromperen Lightning Rod (NOI18_lightningrod) C++17
80 / 100
 2000 ms 229364 KB 
#include <bits/stdc++.h>
using namespace std;

#define ll long long


int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);

	int n; cin >> n;
	int ans = 0;
	int x, y;
	vector<int> pre(n),suf(n);
	for (int i = 0; i < n; ++i) {
		cin >> x>>y;
		pre[i] = x + y;
		if (i > 0) pre[i] = max(pre[i-1], pre[i]);
		suf[i] = y - x;
	}
	for (int i = n -1; i >= 0; --i) {
		if (i < n-1) suf[i] = max(suf[i+1],suf[i]);
	}
	for (int i = 0; i < n; ++i) {
		if (((i == 0) || pre[i] > pre[i-1]) && ((i == n-1) || suf[i] > suf[i+1])) {
			ans++;
		}
	}
	cout << ans << "\n";



	return 0;
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1921 ms 76772 KB Output is correct
2 Correct 1874 ms 78036 KB Output is correct
3 Correct 1836 ms 74052 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 308 KB Output is correct
5 Correct 1 ms 308 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 308 KB Output is correct
5 Correct 1 ms 308 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 316 KB Output is correct
10 Correct 1 ms 204 KB Output is correct

Subtask #4
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 308 KB Output is correct
5 Correct 1 ms 308 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 316 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 320 KB Output is correct
13 Correct 1 ms 332 KB Output is correct

Subtask #5
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 308 KB Output is correct
5 Correct 1 ms 308 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 316 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 320 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 56 ms 1868 KB Output is correct
15 Correct 59 ms 1868 KB Output is correct
16 Correct 54 ms 1868 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1898 ms 78408 KB Output is correct
2 Correct 1935 ms 174500 KB Output is correct
3 Correct 1939 ms 170280 KB Output is correct

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1921 ms 76772 KB Output is correct
2 Correct 1874 ms 78036 KB Output is correct
3 Correct 1836 ms 74052 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 308 KB Output is correct
8 Correct 1 ms 308 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 316 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 320 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 56 ms 1868 KB Output is correct
18 Correct 59 ms 1868 KB Output is correct
19 Correct 54 ms 1868 KB Output is correct
20 Correct 1898 ms 78408 KB Output is correct
21 Correct 1935 ms 174500 KB Output is correct
22 Correct 1939 ms 170280 KB Output is correct
23 Execution timed out 2059 ms 229364 KB Time limit exceeded
24 Halted 0 ms 0 KB -