// 测试：综合测试（所有功能）
int main() {
  int a = 10, b = 5;
  int c = a + b;
  int d = a - b;
  int e = a * 2;
  int f = a / b;
  int g = a % b;
  int h = -c;
  int i = +d;
  a = b + c;
  b = d + e;
  return a + b + f + g + h + i;
}
