View Compilation Error

0_0_33563071_1899.cpp: In function 'int w(int, int)':
0_0_33563071_1899.cpp:14:16: error: expected primary-expression before ')' token
     for(;i<y;++)
                ^
0_0_33563071_1899.cpp: In function 'void dfs(int, int)':
0_0_33563071_1899.cpp:36:9: error: 'i' was not declared in this scope
     for(i=x+1;i<n;i++)
         ^