Ultraviolet A 4997

To search for water questions, you need to pay attention to the search skills. First, we need to pre-process the questions to facilitate debugging and modification. See the following example:

[Cpp] www.2cto.com
// Preprocessing of vertices to be determined
Int dx [] = {, 0,-1 },
Dy [] = {,-,-, 1,-1 };
Int ddx [] = {0, 1, 1, 2 },
Ddy [] = {0,-1, 0, 1, 0 };
 
// This eliminates the need to write a single function and facilitates debugging.
For (int I = 0; I <5; I ++ ){
Int tx = x + ddx [I];
Int ty = y + ddy [I];
//...
}