题解 | #箭形图案#

#include <stdio.h>
int main() {
    int n = 0;

    while (scanf("%d", &n) != EOF) {
        //上一半
        for (int i = 0; i <=n ; i++) { //多一行
            for (int j = 0; j < n - i; j ++) {
                printf("  ");  //4个空格
            }
            for (int k = 0; k<=i ;k++) {
                printf("*");   
            }
            printf("\n");
        }
//下一半
        for (int i = 0; i < n; i++) {
            for (int j = 0; j <= i; j++) {
                printf("  ");
            }
            for (int k = 0; k < n - i; k++) {
                printf("*");
            }
            printf("\n");
        }
    }
    return 0;
}