Submission #1073986

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Source Code Expand

#include <algorithm>  
#include <iostream>  
#include <sstream>  
#include <string>  
#include <cstring>
#include <vector>  
#include <queue>  
#include <set>  
#include <map>  
#include <cstdio>  
#include <cstdlib>  
#include <cctype>  
#include <cmath>  
#include <list>  
#include <cassert>
#include <ctime>
#include <climits>
using namespace std;  

#define PB push_back  
#define MP make_pair  
#define SZ(v) ((int)(v).size())  
#define FOR(i,a,b) for(int i=(a);i<(b);++i)  
#define REP(i,n) FOR(i,0,n)  
#define FORE(i,a,b) for(int i=(a);i<=(b);++i)  
#define REPE(i,n) FORE(i,0,n)  
#define FORSZ(i,a,v) FOR(i,a,SZ(v))  
#define REPSZ(i,v) REP(i,SZ(v))  
typedef long long ll;
typedef unsigned long long ull;
ll gcd(ll a,ll b) { return b==0?a:gcd(b,a%b); }

const int MAXN=100000;

int n;
int par[MAXN];
int chead[MAXN],cnxt[MAXN];
int mem[MAXN];
int cur[MAXN],ncur;

int dfs(int at) {
	for(int to=chead[at];to!=-1;to=cnxt[to]) dfs(to);
	ncur=0; for(int to=chead[at];to!=-1;to=cnxt[to]) cur[ncur++]=mem[to];
	sort(cur,cur+ncur); reverse(cur,cur+ncur); REP(i,ncur) cur[i]+=i+1;
	int ret=ncur; REP(i,ncur) if(cur[i]>ret) ret=cur[i]; return mem[at]=ret;
}

void run() {
	scanf("%d",&n);
	par[0]=-1; FOR(i,1,n) scanf("%d",&par[i]),--par[i];
	REP(i,n) chead[i]=-1;
	FOR(i,1,n) cnxt[i]=chead[par[i]],chead[par[i]]=i;
	int ret=dfs(0);
	printf("%d\n",ret);
}

int main() {
	run();
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘void run()’:
./Main.cpp:49:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
./Main.cpp:50:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  par[0]=-1; FOR(i,1,n) scanf("%d",&par[i]),--par[i];
                                                    ^

Judge Result