题解 | #圣诞树#

#include<stdio.h>
int main() {
    int i, n, m, x;
    scanf("%d", &n);
    for (i = 1; i <= 3 * n; i++) {
        if (i % 3 == 1) {
            for (m = 0; m < 3 * n - i; m++)
                printf(" ");
            printf("* ");
            for (x = i / 3; x > 0; x--) {
                printf("    * ");
            }
            printf("\n");
        }
        if (i % 3 == 2) {
            for (m = 0; m < 3 * n - i; m++)
                printf(" ");
            printf("* * ");
            for (x = i / 3; x > 0; x--) {
                printf("  * * ");
            }
            printf("\n");
        }
        if (i % 3 == 0) {
            for (m = 0; m < 3 * n - i; m++)
                printf(" ");
            printf("* * * ");
            for (x = i / 3 - 1; x > 0; x--) {
                printf("* * * ");
            }
            printf("\n");
        }
    }
    for (i = 0; i < n; i++) {
        for (m = 0; m < 3 * n - 1; m++)
            printf(" ");
        printf("*\n");
    }
    return 0;
}