#include <stdio.h>

int main() 
{
    int a;
    printf("enter the number of rows: \n");
    scanf("%d",&a);
    for(int i=1;i<=a;i++)
        {
            for(int j=1;j<=i;j++)
                {
                    printf("%d\t",j);
                }
            printf("\n");
        }
    return 0;
}

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