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Submission #417977

# Submission time Handle Problem Language Result Execution time Memory
417977 2021-06-04T18:06:03 Z gromperen Lightning Rod (NOI18_lightningrod) C++14
0 / 100
 2000 ms 262144 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;
	vector<int>x(n), y(n);
	for (int i = 0; i < n; ++i) {
		cin >> x[i] >> y[i];
	}

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



	return 0;
}

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2027 ms 262144 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 26.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2036 ms 252804 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2027 ms 262144 KB Time limit exceeded
2 Halted 0 ms 0 KB -