k-mer

input/code.cpp: In function 'int main()':
input/code.cpp:19:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=4;i<s.size();++i){
                       ^

#include <iostream>
#include <string>
using namespace std;
int main(){
	cin.sync_with_stdio(false);
	string s;
	cin>>s;
	char sub[4];
	int M=0;
	int K=0;
	if(s.size()<4){
        cout<<"not sure"<<endl;
        return 0;
	}
	sub[0]=s[0];
	sub[1]=s[1];
	sub[2]=s[2];
	sub[3]=s[3];
	for(int i=4;i<s.size();++i){
        if(sub[0]=='A'&&sub[1]=='T'&&sub[2]=='A'&&sub[3]=='T'){
            ++K;
        }
        else if(sub[0]=='G'&&sub[1]=='C'&&sub[2]=='G'&&sub[3]=='C'){
            ++M;
        }
        sub[0]=sub[1];
        sub[1]=sub[2];
        sub[2]=sub[3];
        sub[3]=s[i];
	}
	 if(sub[0]=='A'&&sub[1]=='T'&&sub[2]=='A'&&sub[3]=='T'){
            ++K;
        }
        else if(sub[0]=='G'&&sub[1]=='C'&&sub[2]=='G'&&sub[3]=='C'){
            ++M;
        }

	if(M>K){
        cout<<"Maija"<<endl;
	} else if(K>M){
        cout<<"Kaaleppi"<<endl;
	} else{
        cout<<"not sure"<<endl;
	}
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED

Test 24

Verdict: ACCEPTED

Test 25

Verdict: ACCEPTED

Test 26

Verdict: ACCEPTED

Test 27

Verdict: ACCEPTED

Test 28

Verdict: ACCEPTED

Test 29

Verdict: ACCEPTED

Test 30

Verdict: ACCEPTED