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#include <iostream> int main() { int rows = 7; for (int i = 1; i <= rows; i++) { for (int j = 1; j <= i; j++) std::cout << " " << j; std::cout << std::endl; } return 0; } /* run: 1 1 2 1 2 3 1 2 3 4 1 2 3 4 5 1 2 3 4 5 6 1 2 3 4 5 6 7 */