Google Code Jam 2016 Round 1A 2016 A. The Last Word

// Google Code Jam 2016 Round 1A 2016
// Problem A. The Last Word
// Problem URL: https://code.google.com/codejam/contest/4304486/dashboard#s=p0&a=0


#include <bitset>
#include <cassert>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <algorithm>
#include <numeric>
#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
#include <list>
#include <queue>
#include <deque>
#include <vector>
#include <map>
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <stack>
#include <limits>

using namespace std;

typedef long long ll;
typedef vector<string> vs;
typedef vector<int> vi;
typedef vector<long long> vll;

void solve()
{
    int numCases = 1;
    cin >> numCases;

    for ( int ncase=1; ncase <= numCases; ncase++ )
    {
        //===== start case
        string S;
        cin >> S;

        string ans=S.substr(0,1);
        for ( int i=1; i<S.size(); i++ )
        {
            if (S[i]>=ans[0])
                ans = S.substr(i,1) + ans;
            else
                ans = ans + S.substr(i,1);
        }
        cout << "Case #" << ncase << ": ";
        cout << ans << endl;

        //===== end case
    }
}

int main()
{
    solve();
    return 0;

}