Submission #1073897

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

#define FOR(i,a,b) for (int i = (a); i < (b); i++)
#define RFOR(i,b,a) for (int i = (b)-1; i >= (a); i--)
#define ITER(it,a) for (__typeof(a.begin()) it = a.begin(); it != a.end(); it++)
#define FILL(a,value) memset(a, value, sizeof(a))

#define SZ(a) (int)a.size()
#define ALL(a) a.begin(), a.end()
#define MP make_pair
#define PB push_back

typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PII;

const double PI = acos(-1.0);
const int INF = 1000 * 1000 * 1000 + 7;
const LL LINF = INF * (LL)INF;

const int MAX = 100100;
int A[MAX];
vector<int> g[MAX];

int get(int x)
{
	if (SZ(g[x]) == 0) return 0;
	vector<int> a;
	FOR (i, 0, SZ(g[x]))
	{
		int to = g[x][i];
		a.PB(get(to));
	}

	sort(ALL(a));
	reverse(ALL(a));

	int res = -INF;
	int d = 1;
	FOR (i, 0, SZ(a))
	{
		res = max(res, a[i] + d);
		d++;
	}

	return res;
}

int main()
{
	//freopen("in.txt", "r", stdin);
	//ios::sync_with_stdio(false); cin.tie(0);

	int n;
	scanf("%d", &n);
	FOR (i, 1, n)
	{
		scanf("%d", &A[i]);
		A[i]--;
		g[A[i]].PB(i);
	}

	cout<<get(0)<<endl;

}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:56:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
./Main.cpp:59:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &A[i]);
                     ^

Judge Result