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B - Coloring Rectangles
https://codeforces.com/contest/1589/submission/135364208
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CodeForces/1589/B/B.cpp
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CodeForces/1589/B/B.cpp
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#include <bits/stdc++.h>
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using namespace std;
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int t, n, m, ans;
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int main() {
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cin >> t;
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while (t--) {
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cin >> n >> m;
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ans = (n * m) / 3;
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cout << ans + !(n % 3 == 0 || m % 3 == 0) << endl;
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}
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return 0;
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}
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