Submission #1996928


Source Code Expand

#include <cstdio>
#include <cstring>
#include <algorithm>
#define P 998244353

using namespace std;

typedef long long ll;

ll powmod(ll x, ll y = P - 2, ll p = P) {
    ll ans = 1;
    while(y) {
        if(y & 1) ans = ans * x % p;
        x = x * x % p;
        y >>= 1;
    }
    return ans;
}

ll Fac[1000010], Rev[1000010], n, m;

ll C(ll x, ll y) {
    if(x < 0 || y < 0 || x < y) return 0;
    return Fac[x] * Rev[y] % P * Rev[x - y] % P;
}

int main() {
    for(int i = 0; i <= 1000001; i++) Fac[i] = !i ? 1 : Fac[i - 1] * i % P;
    for(int i = 1000001; i >= 0; i--) Rev[i] = i == 1000001 ? powmod(Fac[i]) : Rev[i + 1] * (i + 1) % P;
    scanf("%lld%lld", &n, &m);
    ll f = C(n + m, m), g = f, ans = f;
    for(int i = 1; i < n + m; i++) {
        g = (g + (i % 2 == 1 ? -2 : 1) * C(i - 1, (i / 2)) * (C(n + m - (i % 2 == 1) - i, m - i + (i / 2)))) % P;
        ans = (ans + (f = (f + g) % P) * Rev[i + 1] % P * Fac[i]) % P;
    }
    printf("%lld\n", ((ans * powmod(C(n + m, m))) % P + P) % P);
    return 0;
}

Submission Info

Submission Time
Task F - Yes or No
User lastans7
Language C++14 (GCC 5.4.1)
Score 2000
Code Size 1062 Byte
Status AC
Exec Time 38 ms
Memory 15872 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:30:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld%lld", &n, &m);
                              ^

Judge Result

Set Name Sample Partial All
Score / Max Score 0 / 0 1500 / 1500 500 / 500
Status
AC × 5
AC × 28
AC × 75
Set Name Test Cases
Sample sample_01.txt, sample_02.txt, sample_03.txt, sample_04.txt, sample_05.txt
Partial sample_01.txt, sample_02.txt, sample_04.txt, subtask_1_01.txt, subtask_1_02.txt, subtask_1_03.txt, subtask_1_04.txt, subtask_1_05.txt, subtask_1_06.txt, subtask_1_07.txt, subtask_1_08.txt, subtask_1_09.txt, subtask_1_10.txt, subtask_1_11.txt, subtask_1_12.txt, subtask_1_13.txt, subtask_1_14.txt, subtask_1_15.txt, subtask_1_16.txt, subtask_1_17.txt, subtask_1_18.txt, subtask_1_19.txt, subtask_1_20.txt, subtask_1_21.txt, subtask_1_22.txt, subtask_1_23.txt, subtask_1_24.txt, subtask_1_25.txt
All sample_01.txt, sample_02.txt, sample_03.txt, sample_04.txt, sample_05.txt, sample_01.txt, sample_02.txt, sample_03.txt, sample_04.txt, sample_05.txt, subtask_1_01.txt, subtask_1_02.txt, subtask_1_03.txt, subtask_1_04.txt, subtask_1_05.txt, subtask_1_06.txt, subtask_1_07.txt, subtask_1_08.txt, subtask_1_09.txt, subtask_1_10.txt, subtask_1_11.txt, subtask_1_12.txt, subtask_1_13.txt, subtask_1_14.txt, subtask_1_15.txt, subtask_1_16.txt, subtask_1_17.txt, subtask_1_18.txt, subtask_1_19.txt, subtask_1_20.txt, subtask_1_21.txt, subtask_1_22.txt, subtask_1_23.txt, subtask_1_24.txt, subtask_1_25.txt, subtask_2_01.txt, subtask_2_02.txt, subtask_2_03.txt, subtask_2_04.txt, subtask_2_05.txt, subtask_2_06.txt, subtask_2_07.txt, subtask_2_08.txt, subtask_2_09.txt, subtask_2_10.txt, subtask_2_11.txt, subtask_2_12.txt, subtask_2_13.txt, subtask_2_14.txt, subtask_2_15.txt, subtask_2_16.txt, subtask_2_17.txt, subtask_2_18.txt, subtask_2_19.txt, subtask_2_20.txt, subtask_2_21.txt, subtask_2_22.txt, subtask_2_23.txt, subtask_2_24.txt, subtask_2_25.txt, subtask_2_26.txt, subtask_2_27.txt, subtask_2_28.txt, subtask_2_29.txt, subtask_2_30.txt, subtask_2_31.txt, subtask_2_32.txt, subtask_2_33.txt, subtask_2_34.txt, subtask_2_35.txt, subtask_2_36.txt, subtask_2_37.txt, subtask_2_38.txt, subtask_2_39.txt, subtask_2_40.txt
Case Name Status Exec Time Memory
sample_01.txt AC 16 ms 15744 KB
sample_02.txt AC 16 ms 15744 KB
sample_03.txt AC 16 ms 15744 KB
sample_04.txt AC 16 ms 15744 KB
sample_05.txt AC 16 ms 15744 KB
subtask_1_01.txt AC 16 ms 15872 KB
subtask_1_02.txt AC 16 ms 15744 KB
subtask_1_03.txt AC 16 ms 15744 KB
subtask_1_04.txt AC 16 ms 15744 KB
subtask_1_05.txt AC 16 ms 15744 KB
subtask_1_06.txt AC 16 ms 15744 KB
subtask_1_07.txt AC 16 ms 15744 KB
subtask_1_08.txt AC 16 ms 15744 KB
subtask_1_09.txt AC 16 ms 15744 KB
subtask_1_10.txt AC 16 ms 15744 KB
subtask_1_11.txt AC 16 ms 15744 KB
subtask_1_12.txt AC 16 ms 15744 KB
subtask_1_13.txt AC 16 ms 15744 KB
subtask_1_14.txt AC 17 ms 15744 KB
subtask_1_15.txt AC 20 ms 15744 KB
subtask_1_16.txt AC 21 ms 15744 KB
subtask_1_17.txt AC 21 ms 15744 KB
subtask_1_18.txt AC 20 ms 15744 KB
subtask_1_19.txt AC 20 ms 15744 KB
subtask_1_20.txt AC 20 ms 15744 KB
subtask_1_21.txt AC 20 ms 15744 KB
subtask_1_22.txt AC 20 ms 15744 KB
subtask_1_23.txt AC 20 ms 15744 KB
subtask_1_24.txt AC 20 ms 15744 KB
subtask_1_25.txt AC 20 ms 15744 KB
subtask_2_01.txt AC 16 ms 15744 KB
subtask_2_02.txt AC 16 ms 15744 KB
subtask_2_03.txt AC 16 ms 15744 KB
subtask_2_04.txt AC 38 ms 15744 KB
subtask_2_05.txt AC 38 ms 15744 KB
subtask_2_06.txt AC 38 ms 15744 KB
subtask_2_07.txt AC 38 ms 15744 KB
subtask_2_08.txt AC 38 ms 15744 KB
subtask_2_09.txt AC 38 ms 15744 KB
subtask_2_10.txt AC 38 ms 15744 KB
subtask_2_11.txt AC 38 ms 15744 KB
subtask_2_12.txt AC 38 ms 15744 KB
subtask_2_13.txt AC 38 ms 15744 KB
subtask_2_14.txt AC 38 ms 15744 KB
subtask_2_15.txt AC 38 ms 15744 KB
subtask_2_16.txt AC 38 ms 15744 KB
subtask_2_17.txt AC 38 ms 15744 KB
subtask_2_18.txt AC 36 ms 15744 KB
subtask_2_19.txt AC 33 ms 15744 KB
subtask_2_20.txt AC 23 ms 15744 KB
subtask_2_21.txt AC 23 ms 15872 KB
subtask_2_22.txt AC 23 ms 15744 KB
subtask_2_23.txt AC 23 ms 15744 KB
subtask_2_24.txt AC 23 ms 15744 KB
subtask_2_25.txt AC 23 ms 15744 KB
subtask_2_26.txt AC 23 ms 15744 KB
subtask_2_27.txt AC 23 ms 15744 KB
subtask_2_28.txt AC 23 ms 15744 KB
subtask_2_29.txt AC 24 ms 15744 KB
subtask_2_30.txt AC 26 ms 15744 KB
subtask_2_31.txt AC 29 ms 15744 KB
subtask_2_32.txt AC 38 ms 15744 KB
subtask_2_33.txt AC 38 ms 15744 KB
subtask_2_34.txt AC 38 ms 15744 KB
subtask_2_35.txt AC 38 ms 15744 KB
subtask_2_36.txt AC 37 ms 15744 KB
subtask_2_37.txt AC 26 ms 15744 KB
subtask_2_38.txt AC 23 ms 15744 KB
subtask_2_39.txt AC 37 ms 15744 KB
subtask_2_40.txt AC 26 ms 15744 KB