Compilare: main.cpp: In function 'void process()': main.cpp:94:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < cur.size(); ++i) ~~^~~~~~~~~~~~ main.cpp:100:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < cur.size(); j += 2) ~~^~~~~~~~~~~~ main.cpp:104:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < cur.size(); j += 2) ~~^~~~~~~~~~~~ main.cpp:108:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = position; j < cur.size(); j += 2) ~~^~~~~~~~~~~~ main.cpp:117:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < cur.size(); j += 2) ~~^~~~~~~~~~~~ main.cpp:121:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int start = 2; start < cur.size(); start += 2) ~~~~~~^~~~~~~~~~~~ main.cpp:125:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(lst >= cur.size()) ~~~~^~~~~~~~~~~~~ main.cpp:133:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < cur.size(); j += 2) ~~^~~~~~~~~~~~ main.cpp:138:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int start = 3; start < cur.size(); start += 2) ~~~~~~^~~~~~~~~~~~ main.cpp:142:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(lst >= cur.size()) ~~~~^~~~~~~~~~~~~ main.cpp:148:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j <= cur.size() / 2 + 1; ++j) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:152:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(position >= cur.size()) ~~~~~~~~~^~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:14:29: 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); ^