Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:48:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ap[nod] > v[nod].size()) ^ user.cpp: In function ‘int getlca(int, int)’: user.cpp:66:9: warning: unused variable ‘ans’ [-Wunused-variable] int ans = min(rmq[d][preul[nod1]], rmq[d][preul[nod2] - (1 << d) + 1]); ^ user.cpp:67:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘char next()’: user.cpp:17:41: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, BUF, fin), pos = 0; ^