#include <stdio.h>

#define ROW_COUNT 10
#define COL_COUNT 10

void inputMatrix(int matrix[ROW_COUNT][COL_COUNT])
{
    for (int i = 0; i < ROW_COUNT; i++)
    {
        for (int j = 0; j < COL_COUNT; j++)
        {
            printf("Enter elem %d%d\n", i, j);
            scanf("%d", &matrix[i][j]);
        }
    }
}

void printMatrix(int matrix[ROW_COUNT][COL_COUNT])
{
    for (int i = 0; i < ROW_COUNT; i++)
    {
        for (int j = 0; j < COL_COUNT; j++)
        {
            printf("%d", matrix[i][j]);
            printf(" ");
        }
        printf("\n");
    }
}

void swapElems(int matrix[ROW_COUNT][COL_COUNT])
{
    for (int i = 0; i < ROW_COUNT; i++)
    {
        int temp = matrix[i][0];
        matrix[i][0] = matrix[i][i];
        matrix[i][i] = temp;
    }
}

int main()
{
    int matrix[ROW_COUNT][COL_COUNT];
    inputMatrix(matrix);
    printf("Source matrix:\n");
    printMatrix(matrix);
    swapElems(matrix);
    printf("New matrix:\n");
    printMatrix(matrix);
    return 0;
}