//Program to print half pyramid a using #include<stdio.h>
int main() {
    int i,j,rows;
    printf("Enter number of rows: ");
    scanf("%d", &rows);
    for (i=1; i<=rows; ++i) {
        for (j=1; j<=i; ++j)
        { printf("%d ",j); }
        printf("\n");
    }
    return 0;
}