参考代码1:
#include <stdio.h> int fca(int x) { if (x == 1) { return 2; } else { return 3 * x - 1 + fca(x - 1); } } int main() { int x = 0; scanf("%d", &x); int result = fca(x); printf("%d", result); return 0; }
参考代码2:
#include <stdio.h> int main() { int sum = 0,x = 2,y = 3; int n; scanf("%d",&n); sum=(2 * x + (n - 1) * y) * (n / 2); printf("%d",sum); return 0; }
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