제출 #167392

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
167392		theStaticMind	Mag (COCI16_mag)	C++14	24 / 120	867 ms	171328 KiB

mag

#include<bits/stdc++.h>
#define mp make_pair
#define pb push_back
#define ii pair<int,int>
#define all(x) (x).begin(),(x).end()
#define INF 100000000000000000
#define modulo 1000000007
#define mod 998244353
#define int long long int
using namespace std;
struct P{
      int mx,mn;
      void add(int X){
            if(X>mx){
                  mn=mx;
                  mx=X;
            }
            else if(X>mn){
                  mn=X;
            }
      }
      P(int a,int b){
            mx=a;
            mn=b;
      }
};
vector<int>adj[1000005];
vector<int>val(1000005,INF);
vector<P> data(1000005,P(0,0));
int ans=1;
void dfs(int x,int pre){
      for(int i=0;i<adj[x].size();i++){
            int y=adj[x][i];
            if(y==pre)continue;
            dfs(y,x);
            if(val[x]==1&&val[y]==1)
            data[x].add(data[y].mx+1);
      }
      if(val[x]==1)
      ans=max(ans,data[x].mx+data[x].mn+1);
}
int32_t main(){
      ios_base::sync_with_stdio(false);
      cin.tie(NULL);
   //   freopen("q.gir","r",stdin);
   //   freopen("q.cik","w",stdout);
      int n;
      cin>>n;
      for(int i=0;i<n-1;i++){
            int x,y;
            cin>>x>>y;
            adj[x].pb(y);
            adj[y].pb(x);
      }
      for(int i=1;i<=n;i++)cin>>val[i];
      if(*min_element(all(val))>1){
            cout<<*min_element(all(val))<<"/"<<1;
            return 0;
      }
      dfs(1,0);
      cout<<1<<"/"<<ans;
}

컴파일 시 표준 에러 (stderr) 메시지

mag.cpp: In function 'void dfs(long long int, long long int)':
mag.cpp:32:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(int i=0;i<adj[x].size();i++){
                   ~^~~~~~~~~~~~~~

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