摘要："圆的面积" cpp include include using namespace std; double pi=3.14159265358979323; //注意精度 int main(){ int r; cin r; cout 阅读全文

摘要："序列求和" cpp include using namespace std; int main(){ long long int n; cin n; cout 阅读全文

摘要：``` include include using namespace std; int main() { // int 转 string int number = 12; string str; stringstream ss; ss str; cout num; cout 阅读全文