Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:16:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[where].size(); i ++) { ^ user.cpp: In function ‘int lca(int, int)’: user.cpp:42:12: warning: statement has no effect [-Wunused-value] for(poz; poz + rad < r; poz += rad) { ^ user.cpp: In function ‘int main()’: user.cpp:60:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &n, &m); ^ user.cpp:63:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &t[i]); ^ user.cpp:100:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &x, &y); ^