#include<iostream> using namespace std; int main(){ int a,b[100001]; cin>>a; for(int i=0;i<a;i++){ cin>>b[i]; } int c[100001],s=0,d; cin>>d; for(int j=0;j<d;j++){ cin>>c[j]; for(int i=0;i<c[j];i++){ s+=b[i]; } cout<<s<<endl; s=0; } return 0; }

https://www.acgo.cn/problemset/2029/infohomeworkId=195&teamCode=1664181761155715072

#include<bits/stdc++.h> using namespace std; int main(){ int n; cin>>n; set<int>v; int ccin; for(int i=1;i<=n;i++){ cin>>ccin; v.insert(ccin); } cout<<v.size()<<endl; for(auto a:v){ cout<<a<<" "; } return 0; }

a

千万别点题，不然会被笑s

https://www.acgo.cn/application/1679784615526326272