Question

How to print the second row of a 2D vector in C++

Answer 1

#include <iostream>
#include <vector>

int main() {
    std::vector<std::vector<int>> matrix {
        { 1, 4, 8, 9 },
        { 8, 3, 5, 1 },
        { 7, 0, 6, 2 }
    };

    int cols = matrix[0].size();

    for (int j = 0; j < cols; j++) {
        std::cout << matrix[1][j] << " ";
    }
}

   
    
/*
run:

8 3 5 1     

*/

 

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