View Compilation Error

0_0_24320078_9446.cpp: In function 'void matrix_tree()':
0_0_24320078_9446.cpp:80:24: error: 'gar' was not declared in this scope
                     fa[gar[i][j]]=1;
                        ^
0_0_24320078_9446.cpp: In function 'int main()':
0_0_24320078_9446.cpp:109:27: error: 'a' was not declared in this scope
             if(i&&e[i].w!=a[i-1].w||i==m)
                           ^