oj.uz

답안 #687702

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
687702 2023-01-26T21:24:45 Z divad The grade (info1cup18_thegrade) C++14
100 / 100
 50 ms 3324 KB 
#include <bits/stdc++.h>
#define int long long
#define NMAX 1000002
#define FMAX 100002
#define MOD  1000000007
using namespace std;
int fr[NMAX],fact[FMAX],invfact[FMAX],nrperm;
int q,p,t,x,n,sum;

int lgput(int n, int a){
    if(a == 0){
        return 1;
    }else{
        if(a%2 == 0){
            int val = lgput(n, a/2);
            return (val*val)%MOD;
        }else{
            return (n*lgput(n, a-1))%MOD;
        }
    }
}

int comb(int n, int m){
    return ((fact[n]*invfact[m])%MOD*invfact[n-m])%MOD;
}

int stars_and_bars(int n, int k){
    return comb(n+k-1, k-1);
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> q >> p;
    fact[0] = 1;
    invfact[0] = lgput(fact[0], MOD-2);
    for(int i = 1; i <= q; i++){
        fact[i] = fact[i-1]*i;
        fact[i] %= MOD;
        invfact[i] = lgput(fact[i], MOD-2);
    }
    nrperm = 1;
    while(q--){
        cin >> t >> x;
        nrperm *= invfact[n];
        nrperm %= MOD;
        if(t == 0){
            nrperm *= fact[fr[x]];
            nrperm %= MOD;
            n++;
            sum += x;
            fr[x]++;
            nrperm *= invfact[fr[x]];
            nrperm %= MOD;
        }else{
            nrperm *= fact[fr[x]];
            nrperm %= MOD;
            n--;
            sum -= x;
            fr[x]--;
            nrperm *= invfact[fr[x]];
            nrperm %= MOD;
        }
        nrperm *= fact[n];
        nrperm %= MOD;
        if(sum > p){
            /// nu putem sa le distantam
            cout << "-1\n";
            continue;
        }
        /// p-sum = cu cate ne putem juca
        /// nrperm = nr de permutari distincte din A
        cout << (nrperm * stars_and_bars(p-sum, n+1))%MOD << "\n";
    }
    return 0;
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 44 ms 2480 KB Output is correct
3 Correct 43 ms 2648 KB Output is correct
4 Correct 42 ms 2764 KB Output is correct
5 Correct 42 ms 2468 KB Output is correct

Subtask #3
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 340 KB Output is correct
2 Correct 44 ms 2528 KB Output is correct
3 Correct 45 ms 2508 KB Output is correct
4 Correct 44 ms 2512 KB Output is correct

Subtask #4
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 44 ms 2480 KB Output is correct
7 Correct 43 ms 2648 KB Output is correct
8 Correct 42 ms 2764 KB Output is correct
9 Correct 42 ms 2468 KB Output is correct
10 Correct 2 ms 340 KB Output is correct
11 Correct 44 ms 2528 KB Output is correct
12 Correct 45 ms 2508 KB Output is correct
13 Correct 44 ms 2512 KB Output is correct
14 Correct 2 ms 340 KB Output is correct
15 Correct 43 ms 2740 KB Output is correct
16 Correct 42 ms 2768 KB Output is correct
17 Correct 44 ms 2680 KB Output is correct

Subtask #5
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 44 ms 2480 KB Output is correct
3 Correct 43 ms 2648 KB Output is correct
4 Correct 42 ms 2764 KB Output is correct
5 Correct 42 ms 2468 KB Output is correct
6 Correct 43 ms 2852 KB Output is correct
7 Correct 43 ms 2780 KB Output is correct
8 Correct 49 ms 2796 KB Output is correct
9 Correct 44 ms 2736 KB Output is correct

Subtask #6
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 340 KB Output is correct
2 Correct 44 ms 2528 KB Output is correct
3 Correct 45 ms 2508 KB Output is correct
4 Correct 44 ms 2512 KB Output is correct
5 Correct 43 ms 3020 KB Output is correct
6 Correct 43 ms 2980 KB Output is correct
7 Correct 50 ms 3324 KB Output is correct
8 Correct 47 ms 3176 KB Output is correct

Subtask #7
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 44 ms 2480 KB Output is correct
7 Correct 43 ms 2648 KB Output is correct
8 Correct 42 ms 2764 KB Output is correct
9 Correct 42 ms 2468 KB Output is correct
10 Correct 2 ms 340 KB Output is correct
11 Correct 44 ms 2528 KB Output is correct
12 Correct 45 ms 2508 KB Output is correct
13 Correct 44 ms 2512 KB Output is correct
14 Correct 2 ms 340 KB Output is correct
15 Correct 43 ms 2740 KB Output is correct
16 Correct 42 ms 2768 KB Output is correct
17 Correct 44 ms 2680 KB Output is correct
18 Correct 43 ms 2852 KB Output is correct
19 Correct 43 ms 2780 KB Output is correct
20 Correct 49 ms 2796 KB Output is correct
21 Correct 44 ms 2736 KB Output is correct
22 Correct 43 ms 3020 KB Output is correct
23 Correct 43 ms 2980 KB Output is correct
24 Correct 50 ms 3324 KB Output is correct
25 Correct 47 ms 3176 KB Output is correct
26 Correct 45 ms 2856 KB Output is correct
27 Correct 46 ms 2872 KB Output is correct
28 Correct 43 ms 2844 KB Output is correct
29 Correct 43 ms 2768 KB Output is correct
30 Correct 46 ms 2752 KB Output is correct