oj.uz

Submission #238060

# Submission time Handle Problem Language Result Execution time Memory
238060 2020-06-09T20:54:49 Z luciocf K blocks (IZhO14_blocks) C++14
0 / 100
 79 ms 19876 KB 
#include <bits/stdc++.h>

#define ff first
#define ss second

using namespace std;

typedef pair<int, int> pii;

const int maxn = 1e5+10;
const int maxk = 110;
const int inf = 1e9+10;

int n, k;
int a[maxn];

int mn[maxn];

int dp[maxn][maxk];

int main(void)
{
	scanf("%d %d", &n, &k);

	for (int i = 1; i <= n; i++)
		scanf("%d", &a[i]);

	dp[0][1] = inf, dp[1][1] = a[1];
	for (int i = 2; i <= n; i++)
		dp[i][1] = max(a[i], dp[i-1][1]);

	for (int j = 2; j <= k; j++)
	{
		stack<pii> stk;

		for (int i = 0; i < j; i++)
			dp[i][j] = inf;

		mn[j] = dp[j-1][j-1];

		for (int i = j; i <= n; i++)
		{
			if (i != j) mn[i] = inf;

			while (stk.size() && stk.top().ff <= a[i])
			{
				mn[i] = min(mn[i], mn[stk.top().ss]);
				stk.pop();
			}

			stk.push({a[i], i});

			if (a[i] <= a[i-1]) dp[i][j] = min(a[i]+mn[i], dp[i-1][j]);
			else dp[i][j] = a[i]+mn[i];
		}
	}

	printf("%d\n", dp[n][k]);
}

Compilation message

blocks.cpp: In function 'int main()':
blocks.cpp:23:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &k);
  ~~~~~^~~~~~~~~~~~~~~~~
blocks.cpp:26:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i]);
   ~~~~~^~~~~~~~~~~~~

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 4 ms 256 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 5 ms 256 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Incorrect 5 ms 384 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #2
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 256 KB Output is correct
2 Correct 4 ms 256 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Incorrect 4 ms 256 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 47.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 4736 KB Output is correct
2 Correct 20 ms 19712 KB Output is correct
3 Correct 23 ms 19840 KB Output is correct
4 Incorrect 79 ms 19876 KB Output isn't correct
5 Halted 0 ms 0 KB -