Hello,

As I was trying to solve ZigZag problem on topcoder the weirdest thing happend.

#include <bits/stdc++.h>
using namespace std;
class ZigZag {
public:
	int longestZigZag(vector<int> arr) {
		int dp[55], state[55];
		memset(dp, 1, sizeof dp);
		cout << dp[0] << endl;
		memset(state, 0, sizeof state);
		for (int i = 0; i < arr.size(); ++i) {
			for (int j = 0; j < i; ++j) {
				if ((j == 0 || (arr[i] - arr[j] < 0 && state[j] > 0)
						|| (arr[i] - arr[j] > 0 && state[j] < 0))
						&& dp[j] + 1 > dp[i])
					dp[i] = dp[j] + 1, state[i] = arr[i] - arr[j];
			}
		}
		return dp[arr.size() - 1];
	}
};

as I ran the given code, the cout statement gives 16843009.

I removed it and initialized every element int the first loop and it worked.