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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
#599632#5482. Birthday GiftandaheWA 49ms4352kbC++171.9kb2024-09-29 07:45:412024-09-29 07:45:41

Judging History

你现在查看的是最新测评结果

  • [2024-09-29 07:45:41]
  • 评测
  • 测评结果:WA
  • 用时:49ms
  • 内存:4352kb
  • [2024-09-29 07:45:41]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
#define ll long long
const ll mod(1e9+7);
struct Matrix
{
	int n, val;
	vector<vector<ll> > a;
	Matrix(int nn, int vall)
	{
		n = nn, val = vall;
		a.resize(n, vector<ll>(n, 0));
		for(int i = 0; i < a.size(); ++i)
			for(int j = 0; j < a[i].size(); ++j)
				a[i][j] = val;
	}
	vector<ll>& operator[](int r) { return a[r]; }
	const vector<ll>& operator[](int r) const { return a[r]; }
	Matrix operator*(const Matrix &other)
	{
		Matrix ret(n, 0);
		for(int i = 0; i < n; ++i)
			for(int j = 0; j < n; ++j)
				for(int k = 0; k < n; ++k)
					ret[i][j] = (ret[i][j]+a[i][k]*other[k][j])%mod;
		return ret;
	}
	void init()
	{
		for(int i = 0; i < n; ++i) 
			a[i][i] = 1;
	}
};
Matrix Power(Matrix trans, ll n)
{
	Matrix ret(90, 0);
	ret.init();
	for(; n; n >>= 1, trans = trans*trans) if(n&1) ret = ret*trans;
	return ret;
}
bool check(int from ,int to)
{
	if(from%10 == to%10) return 0;
	if(( (from/10)*10+to%10) % 9 == to/10) return 1;
	return 0;
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	freopen("1.in","r",stdin);
	ll a, b; cin >> a >> b;
	if (a == 1) { cout << (b < 10) << endl; return 0;}
    if (a == 2) 
    {
        if (b < 100 && b >= 10 && (b % 10) != (b / 10)) cout << 1 << '\n';
        else cout << 0 << '\n';
        return 0;
    }
    Matrix mx(90, 0);
    for(int i = 0; i < 90; ++i)
    	for(int j = 0; j < 90; ++j)
    		mx[i][j] += check(i, j);
    mx = Power(mx, a-3);
    Matrix f(90, 0);
    for(int i = 1; i <= 9; ++i) f[0][(i%9)*10+i] = 1;
    f = f*mx;
    ll ans = 0;
    for(int i = 0; i < 90; ++i)
    	for(int j = 0; j < 100; ++j)
    	{
    		if (j % 10 == j / 10) continue;
            if (j / 10 == i % 10) continue;
            if (((i/10) * 100 + j) % 225 == b) {
                ans = (ans + f[0][i]) % mod;
            }
    	}
    cout<<ans<<endl;
	return 0;
}

詳細信息

Test #1:

score: 0
Wrong Answer
time: 49ms
memory: 4352kb

input:

12345 200

output:

0

result:

wrong answer 1st lines differ - expected: '323756255', found: '0'