Codeforces Round #288 (Div. 2) 508B - Anton and currency you all know Solution

 

Problem Link:  https://codeforces.com/problemset/problem/508/B

Solve in C++:  

///La ilaha illellahu muhammadur rasulullah

///******Bismillahir-Rahmanir-Rahim******///

///Abul Hasnat  Tonmoy

///Department of CSE,23rd batch

///Islamic University,Bangladesh

///**********ALLAH IS ALMIGHTY************///

#include <bits/stdc++.h>

using namespace std;

int main()

{

    int t,i,j,l,a,n,b;

    string s;

    cin>>s;

    l=s.size();

    a=-1;

    for(i=0; i<l; i++)

    {

        if((s[i]-'0')%2==0)

        {

            a=i;

            if(s[i]<s[l-1])

            break;

        }

    }

    if(a==-1)

        cout<<"-1"<<endl;

    else

    {

        swap(s[a],s[l-1]);

        cout<<s<<endl;

    }

}