Submission #1075135

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Source Code Expand

#include<bits/stdc++.h>
#define rep(i,j,k) for(int i=(int)j;i<=(int)k;i++)
#define per(i,j,k) for(int i=(int)j;i>=(int)k;i--)
using namespace std;
typedef long long LL;
const int N=110000;
int fa[N],n;
int head[N],np[N],p[N],tot;
int f[N];
int q[N],m;
void dp(int x){
    if(!head[x])return;
    for(int u=head[x];u;u=np[u])dp(p[u]);
    m=0;
    for(int u=head[x];u;u=np[u])q[++m]=f[p[u]];
    sort(q+1,q+1+m);
    rep(i,1,m)f[x]=max(f[x],q[i]+m-i+1);
}
int main(){
    scanf("%d",&n);
    rep(i,2,n){
        scanf("%d",&fa[i]);
        ++tot;p[tot]=i;np[tot]=head[fa[i]];head[fa[i]]=tot;
    }
    dp(1);
    printf("%d\n",f[1]);
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:20:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
                   ^
./Main.cpp:22:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&fa[i]);
                           ^

Judge Result