Compilare: main.cpp: In function 'void tree::dfs(int, int)': main.cpp:144:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0; h < g[node].size(); h++) { ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int solve(int, int, FenwickTree&)': main.cpp:225:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0; h < g[node].size(); h++) { ~~^~~~~~~~~~~~~~~~ main.cpp:230:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0; h < queries[node].size(); h++) { ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:29:29: 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, 4096, fin); ^