oj.uz

답안 #1114270

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1114270 2024-11-18T13:21:45 Z ljtunas Zapina (COCI20_zapina) C++14
110 / 110
 210 ms 3584 KB 
#include <bits/stdc++.h>

using namespace std;

#define db  double
#define pb  push_back
#define ll  long long
#define int long long
#define ii  pair<int, int>
#define fi  first
#define se  second
#define vi  vector <int>
#define vii vector<ii>
#define sqrt sqrtl
#define FORV(v, H)     for(auto &v: H)
#define FOR(i, a, b)   for(int i=a;i<=b;++i)
#define FORD(i, a, b)  for(int i=a;i>=b;--i)
#define BIT(mask, i)   ((mask >> i) & 1LL)
#define ONBIT(mask, i) (mask bitor (1LL << i))
#define cnt_BIT(i)   __builtin_popcountll(i)

#define task "zapina"

const int MAXN = 350  + 10;
const int   oo = 1e18 + 8;
const int  MOD = 1e9 + 7;

int N;
int dp[MAXN][MAXN][2];
int GT[MAXN], CKN[MAXN][MAXN];

int Pow(int a, int n) {
    if (n == 0) return 1;
    int h = Pow(a, n / 2);
    h = (h * h) % MOD;
    if (n & 1) return (a * h) % MOD;
    return h;
}

int Ckn(int k, int n) {
    if (k > n) return 0;
    int MAU = (GT[n - k] * GT[k]) % MOD;
    int  TU = GT[n];
    return (TU * Pow(MAU, MOD - 2)) % MOD;
}

int solve(int i, int cnt, bool ok) {
    if (i > N) {
        if (cnt == 0) return ok;
        return 0;
    }
    if (~dp[i][cnt][ok])
        return dp[i][cnt][ok];
    int cur = 0;
    FOR(j, 0, cnt) {
        if (j == i)
            cur = (cur + solve(i + 1, cnt - j, 1) * CKN[j][cnt]) % MOD;
        else
            cur = (cur + solve(i + 1, cnt - j, ok) * CKN[j][cnt]) % MOD;
    }
    return dp[i][cnt][ok] = cur;
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(nullptr);
    cout.tie(nullptr);
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }


    GT[0] = 1;
    FOR(i, 1, MAXN - 5) GT[i] = (GT[i - 1] * i) % MOD;

    FOR(i, 0, MAXN) {
        FOR(j, 0, MAXN) CKN[i][j] = Ckn(i, j);
    }

    cin >> N;
    memset(dp, -1, sizeof(dp));
    cout << solve(1, N, 0);
    return 0;
}

Compilation message

zapina.cpp: In function 'int main()':
zapina.cpp:69:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
zapina.cpp:70:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
zapina.cpp:78:35: warning: iteration 360 invokes undefined behavior [-Waggressive-loop-optimizations]
   78 |         FOR(j, 0, MAXN) CKN[i][j] = Ckn(i, j);
      |                         ~~~~~~~~~~^~~~~~~~~~~
zapina.cpp:16:37: note: within this loop
   16 | #define FOR(i, a, b)   for(int i=a;i<=b;++i)
......
   78 |         FOR(j, 0, MAXN) CKN[i][j] = Ckn(i, j);
      |             ~~~~~~~~~~               
zapina.cpp:78:9: note: in expansion of macro 'FOR'
   78 |         FOR(j, 0, MAXN) CKN[i][j] = Ckn(i, j);
      |         ^~~

Subtask #1
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 3360 KB Output is correct
2 Correct 14 ms 3400 KB Output is correct
3 Correct 14 ms 3456 KB Output is correct
4 Correct 14 ms 3408 KB Output is correct
5 Correct 14 ms 3408 KB Output is correct

Subtask #2
33.0 / 33.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 3360 KB Output is correct
2 Correct 14 ms 3400 KB Output is correct
3 Correct 14 ms 3456 KB Output is correct
4 Correct 14 ms 3408 KB Output is correct
5 Correct 14 ms 3408 KB Output is correct
6 Correct 14 ms 3408 KB Output is correct
7 Correct 14 ms 3408 KB Output is correct
8 Correct 14 ms 3572 KB Output is correct
9 Correct 14 ms 3456 KB Output is correct
10 Correct 14 ms 3408 KB Output is correct
11 Correct 15 ms 3456 KB Output is correct
12 Correct 15 ms 3408 KB Output is correct
13 Correct 14 ms 3460 KB Output is correct
14 Correct 14 ms 3408 KB Output is correct
15 Correct 14 ms 3408 KB Output is correct
16 Correct 16 ms 3408 KB Output is correct

Subtask #3
55.0 / 55.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 3360 KB Output is correct
2 Correct 14 ms 3400 KB Output is correct
3 Correct 14 ms 3456 KB Output is correct
4 Correct 14 ms 3408 KB Output is correct
5 Correct 14 ms 3408 KB Output is correct
6 Correct 14 ms 3408 KB Output is correct
7 Correct 14 ms 3408 KB Output is correct
8 Correct 14 ms 3572 KB Output is correct
9 Correct 14 ms 3456 KB Output is correct
10 Correct 14 ms 3408 KB Output is correct
11 Correct 15 ms 3456 KB Output is correct
12 Correct 15 ms 3408 KB Output is correct
13 Correct 14 ms 3460 KB Output is correct
14 Correct 14 ms 3408 KB Output is correct
15 Correct 14 ms 3408 KB Output is correct
16 Correct 16 ms 3408 KB Output is correct
17 Correct 106 ms 3468 KB Output is correct
18 Correct 16 ms 3408 KB Output is correct
19 Correct 34 ms 3408 KB Output is correct
20 Correct 15 ms 3576 KB Output is correct
21 Correct 138 ms 3408 KB Output is correct
22 Correct 28 ms 3408 KB Output is correct
23 Correct 16 ms 3408 KB Output is correct
24 Correct 43 ms 3420 KB Output is correct
25 Correct 33 ms 3420 KB Output is correct
26 Correct 50 ms 3584 KB Output is correct
27 Correct 195 ms 3408 KB Output is correct
28 Correct 210 ms 3460 KB Output is correct
29 Correct 194 ms 3524 KB Output is correct
30 Correct 195 ms 3520 KB Output is correct
31 Correct 195 ms 3408 KB Output is correct
32 Correct 206 ms 3408 KB Output is correct
33 Correct 199 ms 3408 KB Output is correct
34 Correct 202 ms 3408 KB Output is correct
35 Correct 200 ms 3408 KB Output is correct
36 Correct 208 ms 3408 KB Output is correct
37 Correct 204 ms 3400 KB Output is correct