/in/foo.cc: In function 'void lca_init()':
/in/foo.cc:85:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 for (i = 0; i < point[cur].size(); i++)
             ~~^~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:151:8: warning: unused variable 'j' [-Wunused-variable]
 int i, j;
        ^
/in/foo.cc:153:5: warning: unused variable 'cur' [-Wunused-variable]
 int cur;
     ^~~