Submission #1091928

#TimeUsernameProblemLanguageResultExecution timeMemory
1091928hahahahaZagrade (COI17_zagrade)C++17
100 / 100
518 ms44828 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; ///check the limits, dummy const int N=3e5+5; void minimize(int &x,int y){ if(x>y)x=y;} void maximize(int &x,int y){ if(x<y)x=y;} void add(int &x,int y){ x=x+y;if(x>mod)x-=mod;} void mul(int &x,int y){ x=1ll*x*y%mod;if(x>mod)x-=mod;} int n; int a[N]; vector<int>adj[N]; i64 ans; int sz[N]; bool vis[N]; int pfs[N]; int cnt[N]; int dfsz(int u,int p=0) { sz[u]=1; for(int v:adj[u])if(!vis[v]&&v!=p)sz[u]+=dfsz(v,u); return sz[u]; } int centroid(int u,int S,int p=0) { for(int v:adj[u])if(!vis[v]&&sz[v]>S/2&&v!=p) { return centroid(v,S,u); } return u; } vector<int>V,save; void dfs(int u,int p,int sum,int mn1,int mn2) { if(mn2>=0)save.pb(sum); if(mn1==sum)ans+=cnt[-mn1]; if(sum==0&&mn1>=0)ans++; for(int v:adj[u])if(!vis[v]&&v!=p) { dfs(v,u,sum+a[v],min(mn1,sum+a[v]),min(a[v],a[v]+mn2)); } } void solve(int u) { u=centroid(u,dfsz(u)); vis[u]=1; V.clear(); for(int v:adj[u])if(!vis[v]) { int sum=a[u],mn=a[u]; dfs(v,u,sum+a[v],min(mn,sum+a[v]),min(a[v],mn+a[v])); for(int x:save) { cnt[x-a[u]]++; V.pb(x-a[u]); } save.clear(); } for(int x:V)cnt[x]=0; for(int v:adj[u])if(!vis[v])solve(v); } die_hard_onimai_fan { cin>>n; FOR(i,1,n) { char c; cin>>c; if(c=='(')a[i]=1; else a[i]=-1; } // dbgArr(a,n); FOR(i,2,n) { int u,v; cin>>u>>v; adj[u].pb(v); adj[v].pb(u); } // cout<<'\n'; solve(1); FOR(i,1,n)a[i]=-a[i]; fill(vis+1,vis+n+1,0); solve(1); cout<<ans; } __sumairu__ { FAST file("cum"); int tt=1;//cin>>tt; while(tt--)seggs(); cerr<<"\nTime elapsed: "<<TIME<<" s.\n"; } /** 5 ())(( 1 2 2 3 2 4 3 5 */

Compilation message (stderr)

zagrade.cpp: In function 'int main()':
zagrade.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);}
      |                                              ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
zagrade.cpp:187:5: note: in expansion of macro 'file'
  187 |     file("cum");
      |     ^~~~
zagrade.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);}
      |                                                                            ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
zagrade.cpp:187:5: note: in expansion of macro 'file'
  187 |     file("cum");
      |     ^~~~
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