Submission #3768348

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define lint long long
#define int long long

signed main(){
    int H, W;
    
    cin >> H >> W;
    
    if(H % 3 == 0 | W % 3 == 0){
        cout << 0 << endl;
        return 0;
    }
    
    lint ans = H * W;
    
    for(int i = W / 3; i < W / 3 + 2 && i < W; ++i){
        vector<lint> s;
        s.push_back(i * H);
        lint a = (W - i) * (H / 2);
        
        s.push_back(a);
        s.push_back((W - i) * H - a);
        sort(s.begin(),s.end());
        ans = min(ans, s[2] - s[0]);
        
        vector<lint> t;
        t.push_back(i * H);
        lint b = (W - i) / 2;
        
        t.push_back(b * H);
        t.push_back((W - b - i) * H);
        sort(t.begin(), t.end());
        ans = min(ans, t[2] - t[0]);
    }
    
    for(int i = H / 3; i < H / 3 + 2 && i < H; ++i){
        vector<lint> s;
        s.push_back(i * W);
        lint a = (H - i) * (W / 2);
        s.push_back(a);
        s.push_back((H - i) * W - a);
        sort(s.begin(),s.end());
        ans = min(ans, s[2] - s[0]);
        
        vector<lint> t;
        t.push_back(i * W);
        lint b = (H - i) / 2;
        
        t.push_back(b * W);
        t.push_back((H - b - i) * W);
        sort(t.begin(), t.end());
        ans = min(ans, t[2] - t[0]);
    }
    
    cout << ans << endl;
}

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