Submission #1093694

#TimeUsernameProblemLanguageResultExecution timeMemory
1093694asli_bgRace (IOI11_race)C++11
9 / 100
64 ms12448 KiB
#pragma GCC optimize("O3,unroll-loops") #include "race.h" #include <bits/stdc++.h> using namespace std; //#define int long long #define fi first #define se second #define all(x) x.begin(),x.end() #define pb push_back #define FOR(i,a) for(int i=0;i<(a);i++) #define FORE(i,a,b) for(int i=(a);i<(b);i++) #define cont(x) {for(auto el:x) cout<<el<<' ';cout<<endl;} #define contp(x) {for(auto el:x) cout<<el.fi<<'-'<<el.se<<' ';cout<<endl;} #define sp <<" "<< #define mid (l+r)/2 #define endl '\n' #define DEBUG(X) {cout<<#X<<' '<<(X)<<endl;} #define carp(x,y) ((x%MOD)*(y%MOD))%MOD #define topla(x,y) ((x%MOD)+(y%MOD))%MOD typedef vector<int> vi; typedef pair<int,int> pii; typedef vector<pii> vii; typedef vector<bool> vb; const int MAXN=2e5+5; const int INF=INT_MAX; const int MOD=1e9+7; vii adj[MAXN]; int n,k; int res; pii t[MAXN]; void merge(set<pii>& a,set<pii>& b, int nd){ if(a.size()<b.size()) swap(a,b); //setteki elemanlar--> {dist,edge sayisi} //adjdeki elemanlar--> {kom,dist} int aranan=k+t[nd].se; int cikar=t[nd].fi; auto itt=a.lower_bound({aranan,0}); if((*itt).fi==aranan){ res=min(res,(*itt).se-cikar); } itt=b.lower_bound({aranan,0}); if((*itt).fi==aranan){ res=min(res,(*itt).se-cikar); } //önce cevabı bul for(auto el:b){ auto deg=aranan-el.fi+t[nd].se; if(deg<=0) continue; auto it=a.lower_bound({deg,0}); int bir=(*it).fi; //distance int iki=(*it).se; //no of edges if(bir==deg){ res=min(res,iki+el.se-2*cikar); } } //sonra insertle for(auto el:b) a.insert(el); } set<pii> dfs(int nd,int ata,int h,int edg){ set<pii> s; t[nd]={edg,h}; for(auto el:adj[nd]){ int kom=el.fi; int cost=el.se; if(kom!=ata){ auto c=dfs(kom,nd,h+cost,edg+1); merge(s,c,nd); } } s.insert({t[nd].se,t[nd].fi}); return s; } int best_path(int N, int K, int H[][2], int L[]){ res=INF; k=K; n=N; FOR(i,n-1){ adj[H[i][0]+1].pb({H[i][1]+1,L[i]}); adj[H[i][1]+1].pb({H[i][0]+1,L[i]}); } dfs(1,0,0,0); if(res==INF) res=-1; return res; }
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