Find the error in the code

#1

#include<bits/stdc++.h>
using namespace std;
int m, n;
int cost[1000][1000];
int dp[1000][1000];
void solve()
{
dp[0][0] = cost[0][0];

for (int i = 1; i < n; i++)
{
	dp[0][i] = dp[0][i - 1] + cost[0][i];
}
for (int i = 1; i < m; i++)
{
	dp[i][0] = dp[i - 1][0] + cost[i][0];
}
for (int i = 1; i < m; i++)
{
	for (int j = 1; j < n; j++)
	{
		dp[i][j] = min(dp[i - 1][j], dp[i][j - 1]) + cost[i][j];
	}
}
cout<<dp[m - 1][n - 1];

}
int main()
{
cin >> m >> n;
for (int i = 0; i < m; i++)
{
for (int j = 0; j < n; j++)
{
cin >> cost[m][n];
}
}
solve();
return 0;
}

#2

Hey @310shruti.mishra

#include<bits/stdc++.h>
using namespace std;
int m, n;
int cost[1001][1001];
int dp[1001][1001];
int solve()
{
	dp[0][0] = cost[0][0];

	for (int i = 1; i < n; i++)
	{
		dp[0][i] = dp[0][i - 1] + cost[0][i];
	}
	for (int i = 1; i < m; i++)
	{
		dp[i][0] = dp[i - 1][0] + cost[i][0];
	}
	for (int i = 1; i < m; i++)
	{
		for (int j = 1; j < n; j++)
		{
			dp[i][j] = min(dp[i - 1][j], dp[i][j - 1]) + cost[i][j];
		}
	}
	return dp[m - 1][n - 1];
}
int main()
{


	cin >> m >> n;
	memset(dp, -1, sizeof dp);
	for (int i = 0; i < m; i++)
	{
		for (int j = 0; j < n; j++)
		{
			cin >> cost[i][j]; //cost[i][j] here instead of cost[m][n]
		}
	}
	cout << solve() << endl;
	return 0;
}