제출 #589986

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
589986		Dan4Life	친구 (IOI14_friend)	C++17	19 / 100	42 ms	65536 KiB

friend

#include <bits/stdc++.h>
#if !defined(LOL)
    #include "friend.h"
#endif
using namespace std;
 
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
const int maxn = (int)2e5+10;
vector<int> adj[maxn];
int used[maxn];

void add_edge(int a, int b){
    adj[a].pb(b); adj[b].pb(a);
}

void add_friends(int a, int b){
    for(auto u : adj[a]) add_edge(u,b);
}

bool chk(int s){
    for(auto u : adj[s])
        if(used[u]) return false;
    return true;
}
int C[maxn], dp[maxn][3];

void dfs(int s, int p=-1){
    dp[s][0]=dp[s][1]=0; dp[s][1]=C[s];
    for(auto u : adj[s]){
        if(u==p) continue; dfs(u,s);
        dp[s][1]+=dp[u][0];
        dp[s][0]+=max(dp[u][0],dp[u][1]);
    }
}

int findSample(int n, int c[], int h[], int pro[])
{
    int ans = 0;
    for(int i = 0; i < n; i++) C[i]=c[i];
    for(int i = 1; i < n; i++){
        if(pro[i]!=1) add_edge(h[i],i);
        if(pro[i]) add_friends(h[i],i);
    }
    dfs(0,-1); return max(dp[0][0], dp[0][1]);
}

#if defined(LOL)

int main(void)
{
    #define __MAXSIZE__ 100002
    int confidence[__MAXSIZE__];
    int host[__MAXSIZE__];
    int protocol[__MAXSIZE__];
    int n,i;

    // Number of people
    assert(scanf("%d",&n)==1);
    
    // Confidence
    for(i=0;i<n;i++)
        assert(scanf("%d",&confidence[i])==1);
    
    // Host and Protocol
    for(i=1;i<n;i++)
        assert(scanf("%d %d",&host[i],&protocol[i])==2);
    
    // Answer
    printf("%d\n",findSample(n,confidence,host,protocol));
    return 0;
}
#endif

컴파일 시 표준 에러 (stderr) 메시지

friend.cpp: In function 'void dfs(int, int)':
friend.cpp:32:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   32 |         if(u==p) continue; dfs(u,s);
      |         ^~
friend.cpp:32:28: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   32 |         if(u==p) continue; dfs(u,s);
      |                            ^~~
friend.cpp: In function 'int findSample(int, int*, int*, int*)':
friend.cpp:40:9: warning: unused variable 'ans' [-Wunused-variable]
   40 |     int ans = 0;
      |         ^~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 8
• Subtask 3: 0 / 8
• Subtask 4: 19 / 19
• Subtask 5: 0 / 23
• Subtask 6: 0 / 31