View Compilation Error

0_0_32152127_6164.cpp: In function 'void init()':
0_0_32152127_6164.cpp:16:2: error: 'ma' was not declared in this scope
  ma.clear();
  ^
0_0_32152127_6164.cpp: In function 'int main()':
0_0_32152127_6164.cpp:57:7: error: 'ma' was not declared in this scope
    if(ma.find(s)==ma.end())
       ^
0_0_32152127_6164.cpp:62:7: error: 'ma' was not declared in this scope
    if(ma.find(t)==ma.end())
       ^
0_0_32152127_6164.cpp:67:9: error: 'ma' was not declared in this scope
    join(ma[s],ma[t]);
         ^