View Compilation Error

0_0_38080405_18534.cpp: In function 'int main()':
0_0_38080405_18534.cpp:60:21: error: 'by1' was not declared in this scope
         for(int i = by1;i<=by2;i++){
                     ^
0_0_38080405_18534.cpp:60:28: error: 'by2' was not declared in this scope
         for(int i = by1;i<=by2;i++){
                            ^
0_0_38080405_18534.cpp:61:16: error: 'bx1' was not declared in this scope
             mp[bx1][i] = mp[bx2][i] = -1;
                ^
0_0_38080405_18534.cpp:61:29: error: 'bx2' was not declared in this scope
             mp[bx1][i] = mp[bx2][i] = -1;
                             ^
0_0_38080405_18534.cpp: At global scope:
0_0_38080405_18534.cpp:75:5: error: expected unqualified-id before 'return'
     return 0;
     ^
0_0_38080405_18534.cpp:76:1: error: expected declaration before '}' token
 } 
 ^