58 lines
1.5 KiB
C++
58 lines
1.5 KiB
C++
#include <iostream>
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#include <cstring>
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#include <cstdio>
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#include <algorithm>
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using namespace std;
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const int maxn = 110;
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int map[maxn][maxn];
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int n, m;
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int cal(int i, int j) {
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int ans = 1;
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if (map[i][j+1] == 0)
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ans <<= 1;
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if (map[i+1][j] == 0)
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ans <<= 1;
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if (map[i-1][j] == 0)
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ans <<= 1;
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if (map[i][j-1] == 0)
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ans <<= 1;
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return ans;
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}
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int main() {
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int t;
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scanf("%d", &t);
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while (t--) {
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scanf("%d%d", &n, &m);
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memset(map, -1, sizeof(map));
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int flag = 0;
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for (int i = 1; i <= m; i++) {
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map[1][i] = flag;
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flag = !flag;
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}
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for (int i = 2; i <= n; i++)
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for (int j = 1; j <= m; j++)
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map[i][j] = !map[i-1][j];
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int ans = 0;
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for (int i = 1; i <= n; i++)
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for (int j = 1; j <= m; j++)
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if (map[i][j])
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ans += cal(i, j);
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memset(map, -1, sizeof(map));
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flag = 1;
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for (int i = 1; i <= m; i++) {
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map[1][i] = flag;
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flag = !flag;
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}
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for (int i = 2; i <= n; i++)
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for (int j = 1; j <= m; j++)
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map[i][j] = !map[i-1][j];
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int tmp = 0;
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for (int i = 1; i <= n; i++)
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for (int j = 1; j <= m; j++)
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if (map[i][j])
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tmp += cal(i, j);
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printf("%d\n", max(ans, tmp));
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}
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return 0;
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}
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