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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 |
---|---|---|---|---|---|---|---|---|---|
#694555 | #6522. Digit Mode | Shuishui# | WA | 1ms | 3716kb | C++14 | 3.6kb | 2024-10-31 18:11:10 | 2024-10-31 18:11:10 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define Sz(x) (int)(x).size()
#define bit(x) (1ll << (x))
using ll = long long;
using db = double;
using ull = unsigned long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vii = vector<vi>;
using vl = vector<ll>;
using vll = vector<vl>;
using vs = vector<string>;
using vd = vector<db>;
mt19937 mrand(time(0));
const int mod = 1e9 + 7, CN = 1002;
int inv[CN + 8], fac[CN + 8], ifac[CN + 8];
int C(int a, int b) {
if (b > a || b < 0) return 0;
return 1LL * fac[a] * ifac[b] % mod * ifac[a - b] % mod;
}
void init() {
inv[1] = fac[0] = ifac[0] = 1;
for (int i = 2; i <= CN; i++)
inv[i] = 1LL * (mod - mod / i) * inv[mod % i] % mod;
for (int i = 1; i <= CN; i++)
fac[i] = 1LL * fac[i - 1] * i % mod, ifac[i] = 1LL * ifac[i - 1] * inv[i] % mod;
}
struct Mint;
Mint operator+(Mint, Mint);
struct Mint {
constexpr Mint(long long val = 0) : val((val % mod + mod) % mod) {
}
unsigned& operator*() {
return val;
}
const unsigned& operator*() const {
return val;
}
Mint& operator+=(Mint r) {
return *this = *this + r;
}
unsigned val;
};
Mint operator+(Mint l, Mint r) {
return *l + *r < mod ? *l + *r : *l + *r - mod;
}
Mint operator-(Mint l, Mint r) {
return *l < *r ? *l - *r + mod : *l - *r;
}
Mint operator*(Mint l, Mint r) {
return 1ull * *l * *r % mod;
}
Mint power(Mint l, unsigned long long r) {
Mint x = 1;
for (; r; r >>= 1, l = l * l)
if (r & 1)
x = x * l;
return x;
}
Mint operator/(Mint l, Mint r) {
return l * power(r, mod - 2);
}
Mint fnum[2][52][52], fval[2][52][52];
void solve(void)
{
string s;
cin >> s;
vi dig;
int n = Sz(s);
// cerr << n << "\n";
for (int i = 0; i < n; i++)
dig.pb(s[i] - '0');
Mint ans = 0;
vi ad(10);
auto calc = [&](int num)
{
int onum = num;
num = n;
for (int t = 0; t <= 1; t++)
for (int a = 0; a <= num; a++)
for (int b = 0; b <= num; b++)
fnum[t][a][b] = fval[t][a][b] = 0;
fnum[1][0][0] = 1;
for (int i = 9; i >= 0; i--)
{
int u = i & 1, v = i & 1 ^ 1;
for (int a = 0; a <= num; a++)
for (int b = 0; b <= num; b++)
fnum[v][a][b] = fval[v][a][b] = 0;
for (int a = 0; a <= num; a++)
for (int c = 0; c + a + ad[i] <= num && c + a <= onum; c++)
for (int b = 0; b <= num; b++)
{
Mint pnum = fnum[u][a][b], pval = fval[u][a][b];
if (c + ad[i] > b)
{
fnum[v][a + c][c + ad[i]] += pnum * C(onum - a, c);
fval[v][a + c][c + ad[i]] += pnum * C(onum - a, c) * i;
}
else
{
fnum[v][a + c][b], pnum * C(onum - a, c);
fval[v][a + c][b], pval * C(onum - a, c);
}
}
}
for (int i = 0; i <= num; i++)
ans += fval[1][onum][i];
};
for (int i = 1; i < n; i++)
for (int j = 1; j < 10; j++)
{
ad[j]++;
calc(n - i - 1);
ad[j]--;
}
for (int i = 0; i < n; i++)
{
for (int j = (i) ? 0 : 1; j < dig[i]; j++)
{
ad[j]++;
calc(n - i - 1);
ad[j]--;
}
ad[dig[i]]++;
}
int mx = 0;
for (int i = 1; i <= 9; i++)
if (ad[i] >= ad[mx])
mx = i;
ans += mx;
cout << *ans << "\n";
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(nullptr);
// cout << fixed << setprecision(10);
init();
int T = 1;
cin >> T;
for (int i = 1; i <= T; i++)
solve();
return 0;
}
詳細信息
Test #1:
score: 0
Wrong Answer
time: 1ms
memory: 3716kb
input:
5 9 99 999 99999 999999
output:
9 9 9 9 9
result:
wrong answer 1st numbers differ - expected: '45', found: '9'