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#include <stdio.h>

int main(void) {
	for ( int i =  0 ; i <  5 ; i ++ ) 
			for ( int j = 0 ; j <= i ; j ++ )
				printf( "%d" , j ) ;
	
		
	return 0;
}
Success #stdin #stdout 0.01s 5280KB
stdin
Standard input is empty
stdout
001012012301234