Submission #1096020

#TimeUsernameProblemLanguageResultExecution timeMemory
1096020hahahahaŠarenlist (COCI22_sarenlist)C++17
10 / 110
3 ms456 KiB
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#define i64 long long #define ld long double #define bit(n,i) ((n>>i)&1) #define pii pair<int,int> #define sz(x) (int)x.size() #define FOR(i,a,b) for(int i=a; i<=b; i++) #define FOD(i,a,b) for(int i=a; i>=b; i--) #define fi first #define se second #define pb push_back #define all(x) x.begin(),x.end() #define __sumairu__ signed main() #define die_hard_onimai_fan void seggs() #define file(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".out","w",stdout);} #define brute(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".ans","w",stdout);} #define TIME (1.0*clock()/CLOCKS_PER_SEC) #define FAST ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0); #define ai(n) array<int,n> #define dbg(x) {cerr<<#x<<' '<<x<<endl;} #define dbgArr(arr,n) {cerr<<#arr;FOR(_i,1,n)cerr<<' '<<(arr)[_i];cerr<<endl;} template <typename T,typename U> ostream& operator<<(ostream &os,pair<T,U>p){ return os<<"{"<<p.fi<<", "<<p.se<<"}"; } mt19937_64 rd(chrono::steady_clock::now().time_since_epoch().count()); i64 Rand(i64 l,i64 r) { i64 ans=l+1ll*rd()*rd()%(r-l+1); assert(l<=ans&&ans<=r); return ans; } //const i64 base=1e9+7; //const i64 mod=(1ll<<53)+5; #define i64 long long #define debug 0 const int mod=1e9+7; //const int mod=998244353; const int inf=1e9; const i64 infl=1e18; ///check the limits, dummy const int N=61; int n,m,k; int p[N]; int h[N],par[N]; vector<int>adj[N]; i64 path[N]; void dfs(int u,int p=0) { par[u]=p; h[u]=h[p]+1; for(int v:adj[u])if(v!=p) { dfs(v,u); } } struct DSU { int p[N],mask[N]; int fs(int u){return p[u]<0?u:fs(p[u]);} void uni(int u,int v) { u=fs(u),v=fs(v); if(u==v)return; if(p[u]>p[v])swap(u,v); p[u]+=p[v]; mask[u]|=mask[v]; p[v]=u; } }dsu; int cal(int mask) { FOR(i,1,m) { dsu.p[i]=-1; dsu.mask[i]=path[i]; } FOR(i,0,m-1)if(bit(mask,i)) { FOR(j,i+1,m-1)if(bit(mask,j)) { if(path[i+1]&path[j+1])dsu.uni(i+1,j+1); } } int outside=n-1; int com=0; FOR(i,0,m-1)if(bit(mask,i)&&dsu.fs(i+1)==i+1) { com++; outside-=__builtin_popcountll(dsu.mask[dsu.fs(i+1)]); } return p[com+outside]; } die_hard_onimai_fan { cin>>n>>m>>k; p[0]=1; FOR(i,1,n)p[i]=1ll*p[i-1]*k%mod; FOR(i,2,n) { int u,v; cin>>u>>v; adj[u].pb(v); adj[v].pb(u); } dfs(1); FOR(i,1,m) { int u,v; cin>>u>>v; if(h[u]<h[v])swap(u,v); while(h[u]>h[v]) { path[i]|=(1ll<<u); u=par[u]; } while(u!=v) { path[i]|=(1ll<<u); path[i]|=(1ll<<v); u=par[u],v=par[v]; } } int ans=0; FOR(mask,0,(1<<m)-1) { int tmp=cal(mask); int cnt=__builtin_popcount(mask); if(cnt%2==0)ans=(ans+tmp)%mod; else ans=(ans-tmp+mod)%mod; } cout<<ans; } __sumairu__ { FAST file(""); int tt=1;//cin>>tt; while(tt--)seggs(); cerr<<"\nTime elapsed: "<<TIME<<" s.\n"; } /** 3 1 2 1 2 2 3 1 3 */

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:61:53: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 | #define file(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".out","w",stdout);}
      |                                              ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:202:5: note: in expansion of macro 'file'
  202 |     file("");
      |     ^~~~
Main.cpp:61:83: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 | #define file(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".out","w",stdout);}
      |                                                                            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:202:5: note: in expansion of macro 'file'
  202 |     file("");
      |     ^~~~
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