using namespace std; #include<iostrea> #include<//s+=ai*(sun-1-sumi)for(long longcout<<k;}//1 2 cstr0005]; long losum[1000005]; int main() k=0; for(long long i0;i<s;i++){ cin>>[i]; i == 0m[0]=a[i-1]+a[i]; }

cout<<"想要题解？没门！"‘