제출 #28973

#제출 시각아이디문제언어결과실행 시간메모리
28973tlwpdus새로운 문제 (POI13_luk)C++11
100 / 100
1339 ms25192 KiB
#include <bits/stdc++.h> using namespace std; int n, t; vector<int> lis[300100]; int d[300100]; void dfs(int here, int p) { int i, sum = 0; for (auto &there : lis[here]) { if (there==p) continue; dfs(there,here); sum += d[there]; } d[here] = max(sum-t+1,1); } int main() { int i; scanf("%d",&n); for (i=0;i<n-1;i++) { int a, b; scanf("%d%d",&a,&b); --a; --b; lis[a].push_back(b); lis[b].push_back(a); } int s = 0, e = n; while(s<=e) { int m = (s+e)>>1; t = m; dfs(0,-1); if (d[0]>1) s = m+1; else e = m-1; } printf("%d\n",s); return 0; }

컴파일 시 표준 에러 (stderr) 메시지

luk.cpp: In function 'void dfs(int, int)':
luk.cpp:10:6: warning: unused variable 'i' [-Wunused-variable]
  int i, sum = 0;
      ^
luk.cpp: In function 'int main()':
luk.cpp:22:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
luk.cpp:25:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&a,&b); --a; --b;
                      ^
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