输出以下代码

        1
      1    1
    1   2   1
  1   3    3   1
1   4    6   4  1

#import <Foundation/Foundation.h>

void PrintTree(int line);
int main(int argc, const char * argv[]) {

    /*
             1
           1   1
         1   2   1
       1   3   3   1
     */
    
    PrintTree(7);
    
    return 0;
}

void PrintTree(int line) {
    NSMutableArray *oldArr = [NSMutableArray array];
    NSMutableArray *newArr = [NSMutableArray array];
    
    for (int i = 3; i < line + 1; i++) {
        [newArr removeAllObjects];
        for (int J = 0; J < i; J++) {
            if (J == 0 || J == i - 1) {
                [newArr addObject:@"1"];
            } else {
                [newArr addObject:[NSString stringWithFormat:@"%ld",[oldArr[J] integerValue] + [oldArr[J - 1] integerValue]]];
            }
        }
        
        for (int M = 0; M < line - i; M++) {
            printf(" ");
        }
        
        for (int i = 0; i < newArr.count; i++) {
            if (i == newArr.count - 1) {
                printf("%d",[newArr[i] intValue]);
            } else {
                printf("%d ",[newArr[i] intValue]);
            }
        }
        printf("\n");
        oldArr = [NSMutableArray arrayWithArray:newArr];
    }
}