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

for (auto& v : dp) {
    std::fill(std::begin(v), std::end(v), -1);
}

Inside function, not global scope.