oj.uz

답안 #968690

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
968690 2024-04-23T20:24:47 Z RandomUser Zapina (COCI20_zapina) C++17
110 / 110
 168 ms 2408 KB 
#include <iostream>
#include <iomanip>
#include <cstring>
 
using namespace std;
using ll = long long;
const int mod = 1e9 + 7;
 
void setIO() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}
 
ll fac[351];
ll inv[351];
 
ll exp(ll a, ll b) {
    if(!a) return 0;
    ll ans = 1;
 
    while(b) {
        if(b & 1) ans = (ans * a) % mod;
        a = (a * a) % mod;
        b /= 2;
    }
 
    return ans;
}
 
void setComb() {
    fac[0] = 1;
    for(int i=1; i<=350; i++)
        fac[i] = (i * fac[i-1]) % mod;
 
    inv[0] = 1;
    for(int i=1; i<=350; i++)
        inv[i] = exp(fac[i], mod-2);
}
 
ll choose(ll n, ll k) {
    if(k > n) return 0;
    return fac[n] * inv[k] % mod * inv[n-k] % mod;
}
 
int n;
ll dp[2][351][351];
 
ll f(int pos, bool happy, int left) {
    if(pos == n+1) return (happy && !left);
    if(dp[happy][pos][left] != -1) return dp[happy][pos][left];
    if(!left) return dp[happy][pos][left] = happy;
    if(happy) return dp[happy][pos][left] = exp(n - pos + 1, left);
 
    ll ans = 0;
    for(int i=0; i<=left; i++) {
        int newLeft = left - i; // kolku ke mi ostanat
        bool newHappy = happy | (i == pos);
        ll d1 = choose(left, i);
        ll d2 = f(pos+1, newHappy, newLeft);
        ans += (d1 * d2);
        if(i % 16 == 0) ans %= mod;
    }
 
    return dp[happy][pos][left] = ans % mod;
}
 
int32_t main() {
    setIO();
    setComb();
 
    cin >> n;
    memset(dp, -1, sizeof(dp));
    cout << f(1, 0, n) << '\n';
    return 0;
}

Subtask #1
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2136 KB Output is correct
2 Correct 1 ms 2140 KB Output is correct
3 Correct 1 ms 2140 KB Output is correct
4 Correct 1 ms 2140 KB Output is correct
5 Correct 1 ms 2140 KB Output is correct

Subtask #2
33.0 / 33.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2136 KB Output is correct
2 Correct 1 ms 2140 KB Output is correct
3 Correct 1 ms 2140 KB Output is correct
4 Correct 1 ms 2140 KB Output is correct
5 Correct 1 ms 2140 KB Output is correct
6 Correct 1 ms 2136 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2140 KB Output is correct
9 Correct 1 ms 2140 KB Output is correct
10 Correct 1 ms 2140 KB Output is correct
11 Correct 1 ms 2140 KB Output is correct
12 Correct 1 ms 2140 KB Output is correct
13 Correct 1 ms 2140 KB Output is correct
14 Correct 1 ms 2136 KB Output is correct
15 Correct 1 ms 2140 KB Output is correct
16 Correct 1 ms 2136 KB Output is correct

Subtask #3
55.0 / 55.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2136 KB Output is correct
2 Correct 1 ms 2140 KB Output is correct
3 Correct 1 ms 2140 KB Output is correct
4 Correct 1 ms 2140 KB Output is correct
5 Correct 1 ms 2140 KB Output is correct
6 Correct 1 ms 2136 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2140 KB Output is correct
9 Correct 1 ms 2140 KB Output is correct
10 Correct 1 ms 2140 KB Output is correct
11 Correct 1 ms 2140 KB Output is correct
12 Correct 1 ms 2140 KB Output is correct
13 Correct 1 ms 2140 KB Output is correct
14 Correct 1 ms 2136 KB Output is correct
15 Correct 1 ms 2140 KB Output is correct
16 Correct 1 ms 2136 KB Output is correct
17 Correct 76 ms 2396 KB Output is correct
18 Correct 2 ms 2140 KB Output is correct
19 Correct 17 ms 2400 KB Output is correct
20 Correct 1 ms 2140 KB Output is correct
21 Correct 98 ms 2396 KB Output is correct
22 Correct 12 ms 2392 KB Output is correct
23 Correct 2 ms 2140 KB Output is correct
24 Correct 22 ms 2396 KB Output is correct
25 Correct 16 ms 2404 KB Output is correct
26 Correct 29 ms 2408 KB Output is correct
27 Correct 140 ms 2392 KB Output is correct
28 Correct 144 ms 2396 KB Output is correct
29 Correct 146 ms 2392 KB Output is correct
30 Correct 145 ms 2396 KB Output is correct
31 Correct 143 ms 2396 KB Output is correct
32 Correct 154 ms 2396 KB Output is correct
33 Correct 144 ms 2396 KB Output is correct
34 Correct 168 ms 2396 KB Output is correct
35 Correct 157 ms 2396 KB Output is correct
36 Correct 149 ms 2396 KB Output is correct
37 Correct 159 ms 2392 KB Output is correct