Submission #2561478

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Source Code Expand

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

ll max3(ll x, ll y, ll z) {
  vector<ll> v;
  v.push_back(x);
  v.push_back(y);
  v.push_back(z);
  sort(v.begin(), v.end());
  return v[2];
}

ll min3(ll x, ll y, ll z) {
  vector<ll> v;
  v.push_back(x);
  v.push_back(y);
  v.push_back(z);
  sort(v.begin(), v.end());
  return v[0];
}

int main() {
  ll h, w;
  cin >> h >> w;
  ll ans = 10000000000LL;
  if(h>2) {
    for(int x=1; x<h; x++) {
      ll rh = h-x;
      if(rh<2) break;
      ll ma = w*max3(x, rh/2, rh-rh/2);
      ll mi = w*min3(x, rh/2, rh-rh/2);
      ans = min(ans, ma-mi);
    }
  }
  if(w>2) {
    for(int x=1; x<w; x++) {
      ll rw = w-x;
      if(rw<2) break;
      ll ma = h*max3(x, rw/2, rw-rw/2);
      ll mi = h*min3(x, rw/2, rw-rw/2);
      ans = min(ans, ma-mi);
    }
  }
  for(int x=1; x<h; x++) {
    ll rh = h-x;
    ll a = x*w;
    ll b = rh*(w/2);
    ll c = rh*(w-w/2);
    ll ma = max3(a, b, c);
    ll mi = min3(a, b, c);
    ans = min(ans, ma-mi);
  }
  for(int x=1; x<w; x++) {
    ll rw = w-x;
    ll a = x*h;
    ll b = rw*(h/2);
    ll c = rw*(h-h/2);
    ll ma = max3(a, b, c);
    ll mi = min3(a, b, c);
    ans = min(ans, ma-mi);
  }
  cout << ans << endl;
  return 0;
}
 

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