题解 | #尼科彻斯定理#

#import <Foundation/Foundation.h>

int main(int argc, char* argv[]) {
    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];

    int num;
    scanf("%d", &num);

    // 等差数列第一个元素
    int firstNum = num * num - num + 1;

    for (int i = 0; i < num - 1; i++) {
        printf("%d+", firstNum);
        firstNum += 2;
    }
    printf("%d\n", firstNum);

    [pool drain];
    return 0;
}