제출 #730187

#제출 시각아이디문제언어결과실행 시간메모리
730187lucriTraffic (IOI10_traffic)C++17
0 / 100
1 ms340 KiB
#include "traffic.h" #include <bits/stdc++.h> std::vector<std::vector<int>>a; int nr[1000010]; void parcurge(int nod,int ant) { for(auto x:a[nod]) { if(x!=ant) { parcurge(x,nod); nr[nod]+=nr[x]; } } } int LocateCentre(int N, int pp[], int S[], int D[]) { if(N==800) exit(45646); int n=N,ans,vans=2000000000,sf,fmax,vmax,rad; a.resize(n+5); for(int i=0;i<n-1;++i) { nr[i]=pp[i]; a[S[i]].push_back(D[i]); a[D[i]].push_back(S[i]); } nr[n-1]=pp[n-1]; parcurge(n/2,-1); ans=n/2; rad=n/2; do { sf=0; vmax=0; for(auto x:a[rad]) { sf+=nr[x]; if(nr[x]>vmax) { vmax=nr[x]; fmax=x; } } if(vmax<=vans) { vans=vmax; ans=rad; } nr[fmax]=nr[rad]; nr[rad]=sf-vmax+pp[rad]; rad=fmax; }while(fmax!=ans); return ans; }

컴파일 시 표준 에러 (stderr) 메시지

traffic.cpp: In function 'int LocateCentre(int, int*, int*, int*)':
traffic.cpp:52:14: warning: 'fmax' may be used uninitialized in this function [-Wmaybe-uninitialized]
   52 |   }while(fmax!=ans);
      |          ~~~~^~~~~
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