Compilare: main.cpp: In function 'void dfs2(int)': main.cpp:81:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < tr[nod].size(); ++j) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:111:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < cc[i].size(); ++j) ~~^~~~~~~~~~~~~~ main.cpp:122:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < cc[i].size(); j += 2) ~~^~~~~~~~~~~~~~ main.cpp:126:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < cc[i].size(); j += 2) ~~^~~~~~~~~~~~~~ main.cpp:130:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = position; j < cc[i].size(); j += 2) ~~^~~~~~~~~~~~~~ main.cpp:139:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < cc[i].size(); j += 2) ~~^~~~~~~~~~~~~~ main.cpp:143:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int start = 2; start < cc[i].size(); start += 2) ~~~~~~^~~~~~~~~~~~~~ main.cpp:147:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(lst >= cc[i].size()) ~~~~^~~~~~~~~~~~~~~ main.cpp:155:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < cc[i].size(); j += 2) ~~^~~~~~~~~~~~~~ main.cpp:160:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int start = 3; start < cc[i].size(); start += 2) ~~~~~~^~~~~~~~~~~~~~ main.cpp:164:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(lst >= cc[i].size()) ~~~~^~~~~~~~~~~~~~~ main.cpp:170:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j <= cc[i].size() / 2 + 1; ++j) ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:174:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(position >= cc[i].size()) ~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp:203:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < cc[i].size(); ++j) ~~^~~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:16:29: 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); ^