QOJ.ac

QOJ

ID题目提交者结果用时内存语言文件大小提交时间测评时间
#234694#6698. Flipping GameAlanXWA 136ms6028kbC++201.9kb2023-11-01 20:56:302023-11-01 20:56:30

Judging History

你现在查看的是最新测评结果

  • [2023-11-01 20:56:30]
  • 评测
  • 测评结果:WA
  • 用时:136ms
  • 内存:6028kb
  • [2023-11-01 20:56:30]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
//cout << fixed <<setprecision(2) << ans;
//inline ll read() {
//	ll ans=0,f=1;
//	char c=getchar();
//	while(c<'0' || c>'9') {
//		if(c=='-') f=-1;
//		c=getchar();
//	}
//	while(c>='0' && c<='9') {
//		ans=(ans<<1)+(ans<<3)+(c^48);
//		c=getchar();
//	}
//	return ans*f;
//}
//char F[200];
//inline void out(I_int x) {
//    if (x == 0) return (void) (putchar('0'));
//    I_int tmp = x > 0 ? x : -x;
//    if (x < 0) putchar('-');
//    int cnt = 0;
//    while (tmp > 0) {
//        F[cnt++] = tmp % 10 + '0';
//        tmp /= 10;
//    }
//    while (cnt > 0) putchar(F[--cnt]);
//    //cout<<" ";
//}
#define endl '\n'
const int N=1e5+5,mod=998244353;
ll n,m;
string s,st;
ll dp[205][205];
ll fac[2*N],invfac[2*N];
ll quick_pow(ll a,ll b){
	if(a==0)return 0;
	ll ans=1;
	while(b){
		if(b&1)ans=ans*a%mod;
		a=a*a%mod;
		b=b>>1;
	}
	return ans;
}
ll inv(ll x){
	return quick_pow(x,mod-2);
}
void init(){
	fac[0]=invfac[0]=1;
	for(int i=1;i<N;i++){
		fac[i]=fac[i-1]*i%mod;
	}
	invfac[N-1]=inv(fac[N-1]);
	for(int i=N-2;i>=1;i--){
		invfac[i]=invfac[i+1]*(i+1)%mod;
	}
}
ll C(ll a,ll b){
	if(b<a)return 0;
	return fac[b]*invfac[b-a]%mod*invfac[a]%mod;
}
void solve(){
	ll k;
	cin>>n>>m>>k;
	cin>>s;
	cin>>st;
	ll cnt=0;
	for(int i=0;i<n;i++){
		if(s[i]!=st[i])cnt++;
	}
	for(int i=0;i<=m;i++){
		for(int j=0;j<=n;j++){
			dp[i][j]=0;
		}
	}
	dp[0][0]=1;
	for(int i=1;i<=m;i++){
		for(int j=0;j<=n;j++){
			for(int u=0;u<=j;u++){
				if(k-u>n-j)continue;
				if(j+k-2*u<0||j+k-2*u>n)continue;
				dp[i][j+k-2*u]+=dp[i-1][j]*C(u,j)%mod*C(k-u,n-j)%mod;
				dp[i][j+k-2*u]%=mod;
			}
		}
	}
	cout<<dp[m][cnt]*inv(C(cnt,n)%mod)%mod<<endl;
	return ;
}
int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);cout.tie(0);
	int _=1;
	init();
	cin>>_;
	while(_--)
	solve();
	return 0;
}

详细

Test #1:

score: 100
Accepted
time: 2ms
memory: 6028kb

input:

3
3 2 1
001
100
3 1 2
001
100
3 3 2
001
100

output:

2
1
7

result:

ok 3 number(s): "2 1 7"

Test #2:

score: -100
Wrong Answer
time: 136ms
memory: 5352kb

input:

1000
8 50 2
11111001
01100001
13 4 5
0010011001101
0000001010010
15 58 12
011111110110100
011010000101000
15 30 2
000101100111101
100010100110000
16 99 15
0111011010111101
1000100101011100
7 73 1
0010010
1010111
1 45 1
1
1
15 64 4
111000001000100
111000110011011
13 16 6
0000001101000
0101001010111
5...

output:

0
0
0
0
0
391519374
0
480195112
108378888
0
0
0
602531928
0
0
0
657964873
0
0
0
632552123
168156741
16636231
1
305652451
259008109
0
0
0
0
0
0
990349196
687400400
0
0
838398229
0
89219730
0
0
0
0
0
144619535
411739397
735449326
0
0
0
0
0
0
0
419349749
0
77531359
352542254
0
0
0
1
0
176263839
0
0
0
0...

result:

wrong answer 6th numbers differ - expected: '565123576', found: '391519374'