Compilare: main.cpp: In function 'int main()': main.cpp:164:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(to == v[v[x][y]].size()) ~~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:24:38: 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); ^ main.cpp: In function 'int main()': main.cpp:185:27: warning: 'add' may be used uninitialized in this function [-Wmaybe-uninitialized] int mx = -inf, I = 0, add; ^~~