Ratsun reitit

input/code.cpp: In function 'bool oleva(Piste, int)':
input/code.cpp:16:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

// g++ -std=c++11 -O2 -Wall ratsunreitit.cpp -o ratsunreitit
#include<bits/stdc++.h>
using namespace std;

struct Piste {
    int x, y, matka;
};

bool oleva(Piste p, int koko) {

    if(p.x < 0 || p.y < 0)
        return false;
    else if(p.x >= koko || p.y >= koko) 
        return false;

}

vector<Piste>naapurit(Piste p, int koko) {
    int xliike[] { +1, +2,  +2, +1, -1, -2,  -2, -1 };
    int yliike[] { -2, -1,  +1, +2, +2, +1,  -1, -2 };

    vector<Piste> ret;

    for(int i = 0; i < 8; i ++) {
        Piste tyo;
        tyo.x = p.x + xliike[i];
        tyo.y = p.y + yliike[i];
        if(oleva(tyo, koko)) {
            ret.push_back(tyo);
        }
    }
    return ret;

}

int main() {
    int koko;
    cin >> koko;
    if(koko < 4) return -1;
    
    int ruudukko[koko][koko];
    vector<Piste> jono;

    for( int y = 0; y < koko; y++) {
        for( int x = 0; x < koko; x++) {
            ruudukko[x][y] = INT_MAX;
            Piste tyo; 
            tyo.x = x; tyo.y = y;
            jono.push_back(tyo);
        }
    }

    ruudukko[0][0] = 0;
    while(!jono.empty()) {
        Piste p = jono.back();
        jono.pop_back();
        for(auto & n : naapurit(p, koko)) {
            if(ruudukko[n.x][n.y] > ruudukko[p.x][p.y]) {
                ruudukko[n.x][n.y] = ruudukko[p.x][p.y] + 1;
                jono.push_back(n);
            }
        }
    }

	for(int i = 0; i < koko; i++) {
		ruudukko[i][0] = ruudukko[0][i];
	}

    for(int y = 0; y < koko; y++) {
        for(int x = 0; x < koko; x++) {
            cout << ruudukko[x][y] << " ";
        }
        cout << endl;
    }


}

Test 1

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 2

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 3

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 4

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 5

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 6

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 7

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 8

Group: 2, 3

Verdict: WRONG ANSWER

Test 9

Group: 2, 3

Verdict: WRONG ANSWER

Test 10

Group: 2, 3

Verdict: WRONG ANSWER

Test 11

Group: 3

Verdict: WRONG ANSWER

Test 12

Group: 3

Verdict: WRONG ANSWER

Test 13

Group: 3

Verdict: WRONG ANSWER