View Compilation Error

0_0_13987306_1372.cpp: In function 'bool Relax(int, int, int)':
0_0_13987306_1372.cpp:14:45: error: expected primary-expression before 'return'
  if(dis[to]>dis[from]+w)dis[to]=dis[from]+w,return true; 
                                             ^
0_0_13987306_1372.cpp: In function 'void Init()':
0_0_13987306_1372.cpp:19:29: error: 'memset' was not declared in this scope
  memset(head,-1,sizeof(head));ecnt=0;
                             ^