hdu 5605 geometry（几何，数学）

 1 #pragma comment(linker, "/STACK:1024000000,1024000000")
 2 #include<iostream>
 3 #include<cstdio>
 4 #include<cstring>
 5 #include<cmath>
 6 #include<math.h>
 7 #include<algorithm>
 8 #include<queue>
 9 #include<set>
10 #include<bitset>
11 #include<map>
12 #include<vector>
13 #include<stdlib.h>
14 using namespace std;
15 #define ll long long
16 #define eps 1e-10
17 #define MOD 1000000007
18 #define N 1000000
19 #define inf 1e12
20 int x,y;
21 int main()
22 {
23     int t;
24     scanf("%d",&t);
25     while(t--){
26         scanf("%d%d",&x,&y);
27         printf("%d\n",2*x*y);
28          
29     }
30     return 0;
31 }