Submission #933111
Source Code Expand
#include <iostream>
#include <cstring>
#include <cstdlib>
#include <cstdio>
#include <cmath>
#include <ctime>
#include <queue>
#include <set>
#include <map>
#include <string>
#include <bitset>
#include <vector>
#include <complex>
#include <algorithm>
using namespace std;
typedef long long ll;
typedef double db;
typedef pair<int,int> pii;
typedef vector<int> vi;
#define de(x) cout << #x << "=" << x << endl
#define rep(i,a,b) for(int i=a;i<(b);++i)
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define fi first
#define se second
const int N = 55 , M = 1010 , P = 1e9 + 7;
int Pow(int x,int t){int r=1;for(;t;t>>=1,x=1ll*x*x%P)if(t&1)r=1ll*r*x%P;return r;}
int n , m , K , f[M] = {1}, rf[M];
vector<pii> g[N];
int Cir(int n){
int ret = 0;
rep(i,0,n) (ret += Pow(K , __gcd(i,n))) %= P;
return 1ll * ret * Pow(n , P - 2) % P;
}
int Cirs(int n){
return 1ll * f[n + K - 1] * rf[n] % P * rf[K - 1] % P;
}
int fa[M],pre[M],uv[M],u[M],v[M],dfn[M],_;
int F(int x){return fa[x]==x?x:fa[x]=F(fa[x]);}
void Merge(int a,int b){fa[F(b)]=F(a);}
void dfs(int c,int fa){
dfn[c] = ++_;
for(auto e : g[c]) if(e.fi != fa){
if(!dfn[e.fi]) pre[e.fi]=e.se , dfs(e.fi , c);
else if(dfn[e.fi] < dfn[c]){
for(int i=c;i!=e.fi;i=uv[pre[i]]^i) Merge(e.se , pre[i]);
}
}
}
int main(){
rep(i,1,M) f[i] = 1ll * f[i-1] * i % P;
rep(i,0,M) rf[i] = Pow(f[i] , P - 2);
scanf("%d%d%d",&n,&m,&K);
rep(i,0,m){
int a,b;scanf("%d%d",&a,&b);--a;--b;
u[i] = a , v[i] = b;
uv[i]=a^b;
g[a].pb(mp(b,i));
g[b].pb(mp(a,i));
}
rep(i,0,m) fa[i] = i;
rep(i,0,n) if(!dfn[i]) dfs(i,0);
int ans = 1;
rep(i,0,m) if(F(i) == i){
int edge = 0;
set<int> S;
rep(j,0,m) if(F(j) == i) edge++ , S.insert(u[j]) , S.insert(v[j]);
if(edge == sz(S)) ans = 1ll * ans * Cir(edge) % P;
else ans = 1ll * ans * Cirs(edge) % P;
}
printf("%d\n",ans);
return 0;
}
Submission Info
Compile Error
./Main.cpp: In function ‘int main()’:
./Main.cpp:57:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d%d",&n,&m,&K);
^
./Main.cpp:59:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
int a,b;scanf("%d%d",&a,&b);--a;--b;
^
Judge Result
Set Name |
Sample |
All |
Score / Max Score |
0 / 0 |
1300 / 1300 |
Status |
|
|
Set Name |
Test Cases |
Sample |
0_000.txt, 0_001.txt, 0_002.txt |
All |
0_000.txt, 0_001.txt, 0_002.txt, 1_003.txt, 1_004.txt, 1_005.txt, 1_006.txt, 1_007.txt, 1_008.txt, 1_009.txt, 1_010.txt, 1_011.txt, 1_012.txt, 1_013.txt, 1_014.txt, 1_015.txt, 1_016.txt, 1_017.txt, 1_018.txt, 1_019.txt, 1_020.txt, 1_021.txt, 1_022.txt, 1_023.txt, 1_024.txt, 1_025.txt, 1_026.txt, 1_027.txt, 1_028.txt, 1_029.txt, 1_030.txt, 1_031.txt, 1_032.txt, 1_033.txt, 1_034.txt, 1_035.txt, 1_036.txt, 1_037.txt, 1_038.txt, 1_039.txt, 1_040.txt, 1_041.txt, 1_042.txt, 1_043.txt, 1_044.txt, 1_045.txt, 1_046.txt, 1_047.txt, 1_048.txt, 1_049.txt, 1_050.txt, 1_051.txt, 1_052.txt, 1_053.txt, 1_054.txt, 1_055.txt, 1_056.txt, 1_057.txt, 1_058.txt, 1_059.txt, 1_060.txt, 1_061.txt, 1_062.txt, 1_063.txt |
Case Name |
Status |
Exec Time |
Memory |
0_000.txt |
AC |
3 ms |
256 KB |
0_001.txt |
AC |
3 ms |
256 KB |
0_002.txt |
AC |
3 ms |
256 KB |
1_003.txt |
AC |
3 ms |
256 KB |
1_004.txt |
AC |
3 ms |
256 KB |
1_005.txt |
AC |
3 ms |
256 KB |
1_006.txt |
AC |
3 ms |
256 KB |
1_007.txt |
AC |
3 ms |
256 KB |
1_008.txt |
AC |
3 ms |
256 KB |
1_009.txt |
AC |
3 ms |
256 KB |
1_010.txt |
AC |
3 ms |
256 KB |
1_011.txt |
AC |
3 ms |
256 KB |
1_012.txt |
AC |
3 ms |
256 KB |
1_013.txt |
AC |
3 ms |
256 KB |
1_014.txt |
AC |
3 ms |
256 KB |
1_015.txt |
AC |
3 ms |
256 KB |
1_016.txt |
AC |
3 ms |
256 KB |
1_017.txt |
AC |
3 ms |
256 KB |
1_018.txt |
AC |
3 ms |
256 KB |
1_019.txt |
AC |
3 ms |
256 KB |
1_020.txt |
AC |
3 ms |
256 KB |
1_021.txt |
AC |
3 ms |
256 KB |
1_022.txt |
AC |
3 ms |
256 KB |
1_023.txt |
AC |
3 ms |
256 KB |
1_024.txt |
AC |
3 ms |
256 KB |
1_025.txt |
AC |
3 ms |
256 KB |
1_026.txt |
AC |
3 ms |
256 KB |
1_027.txt |
AC |
3 ms |
256 KB |
1_028.txt |
AC |
3 ms |
256 KB |
1_029.txt |
AC |
3 ms |
256 KB |
1_030.txt |
AC |
3 ms |
256 KB |
1_031.txt |
AC |
3 ms |
256 KB |
1_032.txt |
AC |
3 ms |
256 KB |
1_033.txt |
AC |
3 ms |
256 KB |
1_034.txt |
AC |
3 ms |
256 KB |
1_035.txt |
AC |
3 ms |
256 KB |
1_036.txt |
AC |
3 ms |
256 KB |
1_037.txt |
AC |
3 ms |
256 KB |
1_038.txt |
AC |
3 ms |
256 KB |
1_039.txt |
AC |
3 ms |
256 KB |
1_040.txt |
AC |
3 ms |
256 KB |
1_041.txt |
AC |
3 ms |
256 KB |
1_042.txt |
AC |
3 ms |
256 KB |
1_043.txt |
AC |
3 ms |
256 KB |
1_044.txt |
AC |
3 ms |
256 KB |
1_045.txt |
AC |
3 ms |
256 KB |
1_046.txt |
AC |
3 ms |
256 KB |
1_047.txt |
AC |
3 ms |
256 KB |
1_048.txt |
AC |
3 ms |
256 KB |
1_049.txt |
AC |
3 ms |
256 KB |
1_050.txt |
AC |
3 ms |
256 KB |
1_051.txt |
AC |
3 ms |
256 KB |
1_052.txt |
AC |
3 ms |
256 KB |
1_053.txt |
AC |
3 ms |
256 KB |
1_054.txt |
AC |
3 ms |
256 KB |
1_055.txt |
AC |
3 ms |
256 KB |
1_056.txt |
AC |
3 ms |
256 KB |
1_057.txt |
AC |
3 ms |
256 KB |
1_058.txt |
AC |
3 ms |
256 KB |
1_059.txt |
AC |
3 ms |
256 KB |
1_060.txt |
AC |
3 ms |
256 KB |
1_061.txt |
AC |
3 ms |
256 KB |
1_062.txt |
AC |
3 ms |
256 KB |
1_063.txt |
AC |
3 ms |
256 KB |