View Compilation Error

0_0_21801850_11169.cpp: In function 'void dijstra()':
0_0_21801850_11169.cpp:18:16: error: 'u' was not declared in this scope
              v=u;  
                ^
0_0_21801850_11169.cpp: In function 'void init()':
0_0_21801850_11169.cpp:49:43: error: 'memset' was not declared in this scope
  memset(is_visit, false, sizeof(is_visit) );
                                           ^