Compilare: main.cpp: In function 'void solve()': main.cpp:393:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < table[lin].size(); ++i ) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp:395:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( st < table[lin - 1].size() && table[lin - 1][st].y < table[lin][i].x ) ~~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:399:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( dr < table[lin - 1].size() && table[lin - 1][dr].x <= table[lin][i].y ) ~~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:29:38: 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); ^