Compilare: main.cpp: In function 'void precalc(int, int)': main.cpp:25:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs_lant(int, int)': main.cpp:52:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:70:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'void update(int, int, int, int, int, int)': main.cpp:85:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs_final(int, int)': main.cpp:127:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:135:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<is_lca[nod].size();i++){ ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:162:31: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread (buff,1,4000000,fin); ^