Codeforces Round #352 (Div. 2) A. Summer Camp __ water problem

Use stringstream to build the line , then cout the str[n-1]

#include 
#include 
#include 
#include 
using namespace std;

int main()
{
    int n;
    string line = "12345678910111213141516171819", str;
    scanf("%d", &n);

    for(int i = 20; i <= 500; i++){
        stringstream ss;
        ss<<i; ss>>str;
        line += str;
        //str.clear();
    }
    cout<<line[n-1];
    /*please ignore the follow code
    if(n <= 9) printf("%d", n); else if(n > 9 && n <= 29){ if(n%2 == 0) printf("%d", 1); else{ n-=9; printf("%d", n/2 - 1); } } else if(n > 29){
        n-=29;
        if(n%3 == 1) printf("%d", 1);
        else if(n%3 == 2) printf("%d", (n - 2 + 3)/3 - 1)
    }
*/
    return 0;
}

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