HDU2000:
#include<bits/stdc++.h> #define ll long long using namespace std; int main() { char a,b,c; while(cin>>a>>b>>c){ if(a>b) swap(a,b); if(b>c) swap(b,c); if(a>b) swap(a,b); cout<<a<<" "<<b<<" "<<c<<endl; } return 0; }
HDU1001:
#include<bits/stdc++.h> using namespace std; int main() { long long ans,n; while(cin>>n) { ans=(1+n)*n/2; cout<<ans<<endl; cout<<endl; } return 0; }
HDU2003:
#include<bits/stdc++.h> using namespace std; int main() { double N; while(cin>>N) { if(N>0) printf("%.2lf\n",N); else printf("%.2lf\n",-N); } return 0; }