oj.uz

Submission #59105

# Submission time Handle Problem Language Result Execution time Memory
59105 2018-07-20T14:38:25 Z gabrielsimoes Kangaroo (CEOI16_kangaroo) C++17
100 / 100
 115 ms 32340 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
const int MAXN = 2000;
const ll MOD = 1000000007;

int n, cs, cf;
ll dp[MAXN][MAXN];

ll f(int i, int k) {
	if (k < 0) return 0;
	if (i == n-1) return k == 0 ? 1 : 0;

	ll &ret = dp[i][k];
	if (ret != -1) return ret;
	ret = 0;
	
	ll ks = i > cs;
	ll kf = i > cf;
	
	if (i == cs || i == cf) {
		ret += f(i+1, k);
		ret += f(i+1, k-1) * k;
	} else {
		ret += f(i+1, k+1);
		ret += f(i+1, k-1) * (k*(k-1) + ks*k + k*kf);
	}
	
	return ret %= MOD;
}

int main() {
	memset(dp, -1, sizeof(dp));
	scanf("%d %d %d", &n, &cs, &cf);
	cs--;
	cf--;
	printf("%d\n", f(0, 0));
}

Compilation message

kangaroo.cpp: In function 'int main()':
kangaroo.cpp:38:24: warning: format '%d' expects argument of type 'int', but argument 2 has type 'll {aka long long int}' [-Wformat=]
  printf("%d\n", f(0, 0));
                 ~~~~~~~^
kangaroo.cpp:35:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d", &n, &cs, &cf);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 31608 KB Output is correct
2 Correct 26 ms 31716 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 31608 KB Output is correct
2 Correct 26 ms 31716 KB Output is correct
3 Correct 27 ms 31792 KB Output is correct
4 Correct 31 ms 31792 KB Output is correct
5 Correct 33 ms 31792 KB Output is correct
6 Correct 33 ms 31964 KB Output is correct
7 Correct 31 ms 31964 KB Output is correct
8 Correct 30 ms 32028 KB Output is correct
9 Correct 27 ms 32028 KB Output is correct
10 Correct 26 ms 32028 KB Output is correct
11 Correct 28 ms 32028 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 31608 KB Output is correct
2 Correct 26 ms 31716 KB Output is correct
3 Correct 27 ms 31792 KB Output is correct
4 Correct 31 ms 31792 KB Output is correct
5 Correct 33 ms 31792 KB Output is correct
6 Correct 33 ms 31964 KB Output is correct
7 Correct 31 ms 31964 KB Output is correct
8 Correct 30 ms 32028 KB Output is correct
9 Correct 27 ms 32028 KB Output is correct
10 Correct 26 ms 32028 KB Output is correct
11 Correct 28 ms 32028 KB Output is correct
12 Correct 30 ms 32028 KB Output is correct
13 Correct 27 ms 32084 KB Output is correct
14 Correct 30 ms 32084 KB Output is correct
15 Correct 28 ms 32084 KB Output is correct
16 Correct 32 ms 32084 KB Output is correct
17 Correct 28 ms 32084 KB Output is correct
18 Correct 32 ms 32084 KB Output is correct
19 Correct 34 ms 32084 KB Output is correct
20 Correct 27 ms 32084 KB Output is correct

Subtask #4
49.0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 31608 KB Output is correct
2 Correct 26 ms 31716 KB Output is correct
3 Correct 27 ms 31792 KB Output is correct
4 Correct 31 ms 31792 KB Output is correct
5 Correct 33 ms 31792 KB Output is correct
6 Correct 33 ms 31964 KB Output is correct
7 Correct 31 ms 31964 KB Output is correct
8 Correct 30 ms 32028 KB Output is correct
9 Correct 27 ms 32028 KB Output is correct
10 Correct 26 ms 32028 KB Output is correct
11 Correct 28 ms 32028 KB Output is correct
12 Correct 30 ms 32028 KB Output is correct
13 Correct 27 ms 32084 KB Output is correct
14 Correct 30 ms 32084 KB Output is correct
15 Correct 28 ms 32084 KB Output is correct
16 Correct 32 ms 32084 KB Output is correct
17 Correct 28 ms 32084 KB Output is correct
18 Correct 32 ms 32084 KB Output is correct
19 Correct 34 ms 32084 KB Output is correct
20 Correct 27 ms 32084 KB Output is correct
21 Correct 39 ms 32132 KB Output is correct
22 Correct 42 ms 32192 KB Output is correct
23 Correct 34 ms 32192 KB Output is correct
24 Correct 104 ms 32248 KB Output is correct
25 Correct 111 ms 32248 KB Output is correct
26 Correct 115 ms 32340 KB Output is correct
27 Correct 95 ms 32340 KB Output is correct
28 Correct 76 ms 32340 KB Output is correct