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Submission #125408

# Submission time Handle Problem Language Result Execution time Memory
125408 2019-07-05T09:07:00 Z nhho Mountains (IOI17_mountains) C++14
0 / 100
 2 ms 380 KB 
#include <bits/stdc++.h>
#include "mountains.h"

using namespace std;

constexpr int MAX = 2000;
int dp[MAX][MAX];

bool CanSee(int a, int b, int c, vector<int>& y) {
	return (long long)(y[c] - y[a]) * (b - a) > (long long)(y[b] - y[a]) * (c - a);
}

int maximum_deevs(vector<int> y) {
	int n = y.size();
	for (int i = 0; i < n; i++) {
		dp[i][i] = 1;
		int la = i, add = 1;
		for (int j = i - 1; j >= 0; j--)
			if (la == i || CanSee(j, la, i, y)) {
				add += dp[j + 1][la - 1];
				la = j;
				dp[j][i] = max(dp[j][i - 1], add);
			} else
				dp[j][i] = max(dp[j][i - 1], dp[j][la - 1] + add);
	}
	return dp[0][n - 1];
}

Subtask #1
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 256 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 380 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Incorrect 2 ms 376 KB Output isn't correct
13 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 256 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 380 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Incorrect 2 ms 376 KB Output isn't correct
13 Halted 0 ms 0 KB -

Subtask #3
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 256 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 380 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Incorrect 2 ms 376 KB Output isn't correct
13 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 256 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 376 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 380 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Incorrect 2 ms 376 KB Output isn't correct
13 Halted 0 ms 0 KB -