View Compilation Error

0_0_37840739_27529.cpp: In function 'void AddEdge(int, int, int)':
0_0_37840739_27529.cpp:18:2: error: 'm' was not declared in this scope
  m++;
  ^
0_0_37840739_27529.cpp: In function 'void solve()':
0_0_37840739_27529.cpp:66:8: error: 'read' was not declared in this scope
  read(n);
        ^
0_0_37840739_27529.cpp: In function 'int main()':
0_0_37840739_27529.cpp:86:8: error: 'read' was not declared in this scope
  read(t);
        ^