题解 | #等差数列#
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
#import <Foundation/Foundation.h>
int main(int argc, char* argv[]) {
NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
int n;
int sum = 2;
scanf("%d", &n);
for (int i = 1; i < n; i++) {
sum += i * 3 + 2;
}
printf("%d", sum);
[pool drain];
return 0;
}
查看22道真题和解析