Can someone explain this runtime error? Here's my code: http://ideone.com/pCBf77 Thanks!
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Can someone explain this runtime error? Here's my code: http://ideone.com/pCBf77 Thanks!
This is the question I'm dealing with: http://codeforces.com/problemset/problem/327/A
I'm trying to practice dynamic programming, and this is the code that I have came up.
#include <bits/stdc++.h>
using namespace std;
const int maxN = 100;
int a [maxN + 5], dp [maxN + 5];
int main ()
{
int n;
scanf ("%d", &n);
int ans = 0;
for (int i = 0; i < n; i++)
{
scanf ("%d", &a [i]);
if (a [i] == 1)
ans++; // get how many 1s are in the numbers
}
for (int i = 0; i < n; i++)
{
dp [i] = 0; // set to 0 since we're getting max
for (int j = i; j < n; j++)
{
int count = 0;
for (int k = i; k <= j; k++)
{
if (a [k] == 1)
count -= a [k];
else
count += 1;
} // basically, if we have more zero than ones, we would choose it.
dp [i] = max (count, dp [i]);
}
if (i > 0)
dp [i] = max (dp [i], dp [i - 1]);
}
if (ans == n)
ans--;
printf ("%d\n", ans + dp [n - 1]);
return 0;
}
Though it got accepted, I feel like this isn't the efficient way? So, what is the correct way of doing such dp problem?
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