Compilare: main.cpp: In function 'bool verif(int)': main.cpp:123:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<cbc[x].size(); i++) ~^~~~~~~~~~~~~~ main.cpp:124:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1; j<cbc[x].size(); j++) ~^~~~~~~~~~~~~~ main.cpp: In function 'char read_ch()': main.cpp:22:37: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(in_buff, 1, 4096, fin); ^ main.cpp: In function 'int cautare(int)': main.cpp:135:1: warning: control reaches end of non-void function [-Wreturn-type] } ^