How to initialize a 2D array with all values same?

Question

I want to initialize a 2D array with -1 as all the value. I used memset() for this.

#include 
using namespace std;

int dp[100]         


        

Answer 1

As others have said, you can't call memset in the global scope. The most correct and clear vay is probably going to be something like

#include 
using namespace std;

const int D1 = 100;
const int D2 = 100;
int dp[D1][D2];

void initializeDp()
{
    for (int i = 0; i < D1; i++) {
        for (int j = 0; j < D2; j++) {
            dp[i][j] = -1;
        }
    }
}

int main() {
    initializeDp();
    cout << dp[D1-1][D2-1];
    return 0;
}

If you count global variables as a good practice, obviously. I personally would use a 2d std::array, so it would contain its size itself