#include<iostream>
using namespace std;
int main(){
    unsigned long N;
    while(cin>>N){

    unsigned long sum=0;
    unsigned long i;
    for(i=1;;i++){
        sum+=i;
        if(sum>=N)
            break;
    }
    unsigned int n;
    if(sum==N){
        n=i;
    }else{
        unsigned long x=sum-N;
        if(x%2==0){
            n=i;
        }else{
            n=i+2;
        }
        if(x==1){
            n=i+1;
        }
    }
        cout<<n<<endl;
    }
    return 0;
}

• Re:why I always WA? (581) project 2004-10-04 16:35:37
  • Re:why I always WA? (29) project 2004-10-04 16:37:37