Compilare: main.cpp: In function 'void computedp(int)': main.cpp:86:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0; h < revg[node].size(); h++){ ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs(int)': main.cpp:121:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < cycle.size(); i++) ~~^~~~~~~~~~~~~~ main.cpp:124:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < cycle.size(); i++) { ~~^~~~~~~~~~~~~~ main.cpp:135:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < cycle.size(); i++){ ~~^~~~~~~~~~~~~~ main.cpp:143:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < cycle.size(); i++){ ~~^~~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:19:28: 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, dim, fin); ^