628C - Bear and String Distance - CodeForces Solution

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define all(x) (x).begin(),(x).end()
#define dbg(x) cout<< #x <<" : "<<x<<endl;
#define dbgv(v) cout<< #v <<" : ";for(auto &i:v) cout<<i<<" ";cout<<endl;
#define endl '\n'
const int MOD = 1e9+ 7;

int main() {
	ios_base::sync_with_stdio(false);
   cin.tie(0);
   cout.tie(0);
	int T = 1,i;
	//cin>>T;
	while(T--) {
    	//string S;
    	//cin>>S;
    	int N,K;
    	cin>>N>>K;
    	string S;
    	cin>>S;
    	string V="";
    	for(i=0;i<N;i++)
    	{
    		if(K>0)
    		{
    			int P=max(abs(S[i]-'a'),abs(S[i]-'z'));
    			if(P<K)
    			{
    				if(P==abs(S[i]-'a'))
    				{
    					S[i]='a';
    				}
    				else
    				{
    					S[i]='z';
    				}
    				K=K-P;
    			}
    			else if(P==K)
    			{
    				if(P==abs(S[i]-'a'))
    				{
    					S[i]='a';
    				}
    				else
    				{
    					S[i]='z';
    				}
    				K=0;
    			}
    			else
    			{
    				if(S[i]+K<='z')
    				{
    					S[i]=S[i]+K;
    					K=0;
    				}
    				else
    				{
    					S[i]=S[i]-K;
    					K=0;
    				}
    			}
    		}
    		if(K==0)
    		{
    			break;
    		}
    	}
    	//cout<<K<<endl;
    	if(K==0)
    	{
    		cout<<S<<endl;
    	}
    	else
    	{
    		cout<<-1<<endl;
    	}
	}
}