Compilare: main.cpp: In function 'void HLD::computepath(int, int)': main.cpp:100:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0; h < g[node].size(); h++){ ~~^~~~~~~~~~~~~~~~ main.cpp:108:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0; h < g[node].size(); h++){ ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs(int, int)': main.cpp:171:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0; h < g[node].size(); h++){ ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void dfsclear(int, int)': main.cpp:181:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0; h < g[node].size(); h++){ ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:196:7: warning: variable 'root' set but not used [-Wunused-but-set-variable] int root = 0; ^~~~ main.cpp:209:13: warning: unused variable '_m' [-Wunused-variable] long long _m = m; ^~ main.cpp:210:16: warning: unused variable '_c' [-Wunused-variable] unsigned int _c = c; ^~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:22:29: 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); ^