// Input - Position of the Knight.(c4, g3) // Output - Possible Places to Move to, // and a Diagrammatic Representation. #include #include #include #include // Defines to make typing easier #define to_c(x) static_cast(x) #define Board array,b_size> using namespace std; using sint = unsigned short; using str = string; // Can be set to any arbitary size, // if required so. const sint b_size = 8; // Fuses characters to form a string. str fuse(char a,char b) { str s; s+=a; s+=b; return s; } // Marks a location on a board. void Mark(Board& b, str p, char mk = '0') { b[b_size-(p[1]-48)][p[0]-97]= mk; } // Checks the validity of an input position. bool valid(str p) { return (p[1]<=to_c(48+b_size)&&p[1]>'0') &&(p[0]<=to_c(96+b_size)&&p[0]>='a'); } // Draws the chessboard with possible indexes. void Draw(str cpos) { set coords; for(char i=cpos[0]-2;i<=cpos[0]+2;i+=4) { if(valid(fuse(i,cpos[1]-1))) coords.insert(fuse(i,cpos[1]-1)); if(valid(fuse(i,cpos[1]+1))) coords.insert(fuse(i,cpos[1]+1)); } for(char i=cpos[1]-2;i<=cpos[1]+2;i+=4) { if(valid(fuse(cpos[0]-1,i))) coords.insert(fuse(cpos[0]-1,i)); if(valid(fuse(cpos[0]+1,i))) coords.insert(fuse(cpos[0]+1,i)); } cout<<"Possible Locations from "<>pos; if(not valid(pos)) { cerr<<"INDEX_ERROR : Invalid Knight " <<"Position."; return 1; } Draw(pos); }

Challenge - Knight Attack