题解 | #等差数列#
等差数列
http://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
华为最短系列🤭
int main() {
int n;
while(std::cin>>n){
int temp = 2*n+3*(n-1)*n/2;
std::cout<<temp;
}
}
等差数列
http://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
int main() {
int n;
while(std::cin>>n){
int temp = 2*n+3*(n-1)*n/2;
std::cout<<temp;
}
}
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