C++ 打印字符图形：数字三角形

"#include ""\nusing namespace std;\n\nint main() {\n int N;\n cin >> N;\n\n for (int i = 1; i <= N; i++) {\n // 打印空格\n for (int j = 1; j <= N - i; j++) {\n cout << " " ;\n }\n\n // 打印数字\n for (int j = 1; j <= 2 * i - 1; j++) {\n cout << j;\n }\n cout << endl;\n }\n\n return 0;\n}