#include<iostream> #include<cstdio> using namespace std; const int maxn=20005; int num[maxn]; int a[5005]={0}; int main() { int n; cin>>n; int m; while(n--) { cin>>m; if(a[m]==0) //不用set { cout<<m<<" "; a[m]=1; } } return 0; }
#include<iostream> #include<cstdio> using namespace std; const int maxn=20005; int num[maxn]; int a[5005]={0}; int main() { int n; cin>>n; int m; while(n--) { cin>>m; if(a[m]==0) //不用set { cout<<m<<" "; a[m]=1; } } return 0; }