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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 |
---|---|---|---|---|---|---|---|---|---|
#99733 | #5089. 环覆盖 | yllcm | 0 | 0ms | 0kb | C++17 | 2.0kb | 2023-04-23 16:23:37 | 2023-04-23 16:23:39 |
Judging History
answer
#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define db double
#define ldb long double
#define pb push_back
#define mp make_pair
#define pii pair<int, int>
#define FR first
#define SE second
using namespace std;
inline int read() {
int x = 0; bool op = 0;
char c = getchar();
while(!isdigit(c))op |= (c == '-'), c = getchar();
while(isdigit(c))x = (x << 1) + (x << 3) + (c ^ 48), c = getchar();
return op ? -x : x;
}
const int N = 1e5 + 10;
const int P = 1e9 + 7;
void add(int &a, int b) {a = (a + b) % P;}
void sub(int &a, int b) {a = (a - b + P) % P;}
int ksm(int x, int k) {
int res = 1;
for(int pw = x; k; (k & 1) ? res = 1ll * res * pw % P : 0, pw = 1ll * pw * pw % P, k >>= 1);
return res;
}
int n, m;
int g[N], cnt[N], fac[N], ifac[N];
void dfs(int cur, int S, int now) {
if(cur >= n)return cnt[now]++, void();
dfs(cur + 1, S, now);
dfs(cur + 1, S | (1 << cur), now - 2 * __builtin_popcount(g[cur] & S) + __builtin_popcount(g[cur]));
return ;
}
void init() {
fac[0] = ifac[0] = 1;
for(int i = 1; i < N; i++)fac[i] = 1ll * fac[i - 1] * i % P;
ifac[N - 1] = ksm(fac[N - 1], P - 2);
for(int i = N - 2; i; i--)ifac[i] = 1ll * ifac[i + 1] * (i + 1) % P;
return ;
}
int f[N];
int com(int n, int m) {return n < m || m < 0 ? 0 : 1ll * fac[n] * ifac[m] % P * ifac[n - m] % P;}
int main() {
freopen("in.txt", "r", stdin);
init();
n = read(); m = read();
for(int i = 1; i <= m; i++) {
int u = read() - 1, v = read() - 1;
g[u] |= (1 << v); g[v] |= (1 << u);
}
dfs(0, 0, 0);
for(int i = 0; i <= m; i++) {
// printf("cnt:%d %d\n", i, cnt[i]);
for(int j = 0; j <= m; j++) {
for(int k = 0; k <= m; k++) {
int sgn = (j & 1) ? P - 1 : 1;
add(f[j + k], 1ll * cnt[i] * sgn % P * com(i, j) % P * com(m - i, k) % P);
}
}
}
for(int i = 0; i <= m; i++)printf("%d ", 1ll * ksm(1 << n, P - 2) * f[i] % P);
return 0;
}
詳細信息
Subtask #1:
score: 0
Time Limit Exceeded
Test #1:
score: 0
Time Limit Exceeded
input:
10 9 3 5 3 10 4 7 4 8 5 6 5 9 6 9 7 9 9 10
output:
result:
Subtask #2:
score: 0
Skipped
Dependency #1:
0%
Subtask #3:
score: 0
Time Limit Exceeded
Test #31:
score: 0
Time Limit Exceeded
input:
25 45 1 6 1 12 1 17 2 3 2 4 2 6 3 6 3 8 4 5 4 12 4 16 5 17 6 21 7 14 7 22 7 23 8 15 8 19 8 24 9 11 9 19 9 23 9 25 10 17 10 18 11 16 11 19 11 22 12 19 13 18 14 19 15 19 16 24 17 19 17 22 17 25 18 19 18 21 18 24 19 23 20 22 21 25 22 23 23 25 24 25
output:
result:
Subtask #4:
score: 0
Skipped
Dependency #2:
0%
Subtask #5:
score: 0
Skipped
Dependency #4:
0%