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View Compilation Error

0_0_35307023_12345.cpp:6:27: error: 'MAXNUM' was not declared in this scope
 int M, N, mp[60][60], pre[MAXNUM];  
                           ^
0_0_35307023_12345.cpp: In function 'int find(int, int)':
0_0_35307023_12345.cpp:10:12: error: 'pre' was not declared in this scope
     while (pre[tmp] != tmp)
            ^
0_0_35307023_12345.cpp: In function 'void Union(int, int, int, int)':
0_0_35307023_12345.cpp:18:9: error: 'pre' was not declared in this scope
         pre[b] = a;
         ^
0_0_35307023_12345.cpp: In function 'int main()':
0_0_35307023_12345.cpp:28:25: error: reference to 'tm' is ambiguous
             scanf("%s", tm);
                         ^
0_0_35307023_12345.cpp:5:6: note: candidates are: char tm [60]
 char tm[60];
      ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/ctime:42:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:49,
                 from 0_0_35307023_12345.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/time.h:88:10: note:                 struct tm
   struct tm {
          ^
0_0_35307023_12345.cpp:30:28: error: reference to 'tm' is ambiguous
                 mp[i][j] = tm[j] - 'A';
                            ^
0_0_35307023_12345.cpp:5:6: note: candidates are: char tm [60]
 char tm[60];
      ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/ctime:42:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:49,
                 from 0_0_35307023_12345.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/time.h:88:10: note:                 struct tm
   struct tm {
          ^
0_0_35307023_12345.cpp:34:13: error: 'pre' was not declared in this scope
             pre[i] = i;
             ^
0_0_35307023_12345.cpp:52:36: error: expected primary-expression before 'break'
                         flag = 1,  break;
                                    ^


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