View Compilation Error

0_0_20134879_20380.cpp: In function 'void init()':
0_0_20134879_20380.cpp:16:16: error: expected primary-expression before '=' token
  for(int i=1;i,=n;i++){gra[i].clear();component[i].clear();}
                ^
0_0_20134879_20380.cpp: In function 'void tarjan(int)':
0_0_20134879_20380.cpp:25:23: error: lvalue required as increment operand
  if(low[u]==dfn[u]){++component;
                       ^