View Compilation Error

0_0_17934592_23207.cpp: In function 'void dsort()':
0_0_17934592_23207.cpp:49:9: error: 'm' was not declared in this scope
  for (i=m/2;i>0;i--)
         ^
0_0_17934592_23207.cpp:51:9: error: 'm' was not declared in this scope
  for (i=m;i>0;i--)
         ^
0_0_17934592_23207.cpp: In function 'int kruskal()':
0_0_17934592_23207.cpp:69:14: error: 'm' was not declared in this scope
  for (i=1;i<=m;i++)
              ^
0_0_17934592_23207.cpp: In function 'int main()':
0_0_17934592_23207.cpp:104:3: error: 'm' was not declared in this scope
   m=0;
   ^