Compilare: main.cpp: In function 'void solve()': main.cpp:81:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (ptr1 = 0, ptr2 = 0; ptr1 < st[i].size(); ++ptr1) { ~~~~~^~~~~~~~~~~~~~ main.cpp:82:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (ptr2 < dr[i].size() && gcd(st[i][ptr1].val, dr[i][ptr2].val) == 1) ~~~~~^~~~~~~~~~~~~~ main.cpp:84:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] mx[st[i][ptr1].bnd] = max(mx[st[i][ptr1].bnd], (ptr2 < dr[i].size() ? dr[i][ptr2].bnd : i)); } } ~~~~~^~~~~~~~~~~~~~ main.cpp: In member function 'char InParser::nextch()': main.cpp:18:28: 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, BMAX, fi); ^