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Submission #409891

# Submission time Handle Problem Language Result Execution time Memory
409891 2021-05-21T18:36:03 Z CaroLinda The short shank; Redemption (BOI21_prison) C++14
35 / 100
 119 ms 45744 KB 
#include <bits/stdc++.h>

const int MAXN = 4010 ;

using namespace std ;

int N , D , T , toGet, toFill = 1 ;
int t[MAXN] ;
int dp[2][MAXN]; 
int cost[MAXN][MAXN] ;

void solve(int l, int r, int optmin , int optmax )
{
	if(l > r) return ;

	int mid = (l+r)>>1 ;
	int opt = optmin ;
	dp[toFill][mid] = cost[opt][mid]+dp[toGet][opt-1] ;

	for(int i = optmin+1 ; i <= min(mid,optmax) ; i++ )
	{
		int newCost = cost[i][mid] + dp[toGet][i-1] ;
		if(newCost >= dp[toFill][mid]) continue ;
		opt = i ;
		dp[toFill][mid] = newCost ;
	}

	solve(l, mid-1, optmin, opt ) ;
	solve(mid+1, r, opt, optmax  );
}

int main()
{
	scanf("%d %d %d", &N, &D, &T  ) ;
	for(int i = 1 ; i <= N ; i++ ) scanf("%d", &t[i] ) ;

	for(int i = 1 ; i <= N ; i++ )
	{
		int s = t[i]+1 ;
		cost[i][i] = t[i] <= T ;

		for(int j = i+1 ; j <= N ; j++ , s++ )
		{
			s = min(s, t[j] ) ;
			cost[i][j] = cost[i][j-1]+(s <= T ) ;
		}

	}

	for(int i = 1 ; i <= N ; i++ ) dp[0][i] = cost[1][i] ;
	for(int i = 1 ; i <= D ; i++ , swap(toGet, toFill) ) 
	{
		for(int j = 1 ; j <= i ; j++ ) dp[toFill][j] = dp[toGet][j] ;
		solve(i+1, N, i+1, N ) ;
	}

	printf("%d\n", dp[toGet][N] ) ;

}

Compilation message

prison.cpp: In function 'int main()':
prison.cpp:34:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |  scanf("%d %d %d", &N, &D, &T  ) ;
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
prison.cpp:35:38: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |  for(int i = 1 ; i <= N ; i++ ) scanf("%d", &t[i] ) ;
      |                                 ~~~~~^~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 2 ms 2252 KB Output is correct
3 Correct 2 ms 2252 KB Output is correct
4 Correct 3 ms 2764 KB Output is correct
5 Correct 3 ms 2764 KB Output is correct
6 Correct 2 ms 2732 KB Output is correct
7 Correct 3 ms 2764 KB Output is correct
8 Correct 2 ms 2776 KB Output is correct
9 Correct 3 ms 2764 KB Output is correct
10 Correct 3 ms 2764 KB Output is correct
11 Correct 3 ms 2764 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Runtime error 6 ms 616 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 2 ms 2252 KB Output is correct
3 Correct 2 ms 2252 KB Output is correct
4 Correct 3 ms 2764 KB Output is correct
5 Correct 3 ms 2764 KB Output is correct
6 Correct 2 ms 2732 KB Output is correct
7 Correct 3 ms 2764 KB Output is correct
8 Correct 2 ms 2776 KB Output is correct
9 Correct 3 ms 2764 KB Output is correct
10 Correct 3 ms 2764 KB Output is correct
11 Correct 3 ms 2764 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 2 ms 2252 KB Output is correct
14 Correct 2 ms 2252 KB Output is correct
15 Correct 3 ms 2764 KB Output is correct
16 Correct 3 ms 2764 KB Output is correct
17 Correct 2 ms 2764 KB Output is correct
18 Correct 3 ms 2764 KB Output is correct
19 Correct 2 ms 2764 KB Output is correct
20 Correct 2 ms 2764 KB Output is correct
21 Correct 3 ms 2764 KB Output is correct
22 Correct 3 ms 2764 KB Output is correct
23 Correct 51 ms 45740 KB Output is correct
24 Correct 70 ms 45636 KB Output is correct
25 Correct 85 ms 45736 KB Output is correct
26 Correct 101 ms 45672 KB Output is correct
27 Correct 119 ms 45632 KB Output is correct
28 Correct 44 ms 45680 KB Output is correct
29 Correct 48 ms 45744 KB Output is correct
30 Correct 56 ms 45720 KB Output is correct
31 Correct 76 ms 45636 KB Output is correct
32 Correct 80 ms 45724 KB Output is correct
33 Correct 79 ms 45728 KB Output is correct
34 Correct 41 ms 45636 KB Output is correct
35 Correct 118 ms 45616 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Runtime error 5 ms 620 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #5
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 2 ms 2252 KB Output is correct
3 Correct 2 ms 2252 KB Output is correct
4 Correct 3 ms 2764 KB Output is correct
5 Correct 3 ms 2764 KB Output is correct
6 Correct 2 ms 2732 KB Output is correct
7 Correct 3 ms 2764 KB Output is correct
8 Correct 2 ms 2776 KB Output is correct
9 Correct 3 ms 2764 KB Output is correct
10 Correct 3 ms 2764 KB Output is correct
11 Correct 3 ms 2764 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 2 ms 2252 KB Output is correct
14 Correct 2 ms 2252 KB Output is correct
15 Correct 3 ms 2764 KB Output is correct
16 Correct 3 ms 2764 KB Output is correct
17 Correct 2 ms 2764 KB Output is correct
18 Correct 3 ms 2764 KB Output is correct
19 Correct 2 ms 2764 KB Output is correct
20 Correct 2 ms 2764 KB Output is correct
21 Correct 3 ms 2764 KB Output is correct
22 Correct 3 ms 2764 KB Output is correct
23 Correct 51 ms 45740 KB Output is correct
24 Correct 70 ms 45636 KB Output is correct
25 Correct 85 ms 45736 KB Output is correct
26 Correct 101 ms 45672 KB Output is correct
27 Correct 119 ms 45632 KB Output is correct
28 Correct 44 ms 45680 KB Output is correct
29 Correct 48 ms 45744 KB Output is correct
30 Correct 56 ms 45720 KB Output is correct
31 Correct 76 ms 45636 KB Output is correct
32 Correct 80 ms 45724 KB Output is correct
33 Correct 79 ms 45728 KB Output is correct
34 Correct 41 ms 45636 KB Output is correct
35 Correct 118 ms 45616 KB Output is correct
36 Correct 1 ms 332 KB Output is correct
37 Runtime error 5 ms 620 KB Execution killed with signal 11
38 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 2 ms 2252 KB Output is correct
3 Correct 2 ms 2252 KB Output is correct
4 Correct 3 ms 2764 KB Output is correct
5 Correct 3 ms 2764 KB Output is correct
6 Correct 2 ms 2732 KB Output is correct
7 Correct 3 ms 2764 KB Output is correct
8 Correct 2 ms 2776 KB Output is correct
9 Correct 3 ms 2764 KB Output is correct
10 Correct 3 ms 2764 KB Output is correct
11 Correct 3 ms 2764 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Runtime error 6 ms 616 KB Execution killed with signal 11
14 Halted 0 ms 0 KB -