Compilare: main.cpp: In function 'void add(int)': main.cpp:20:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nr[poz].size();i++){ ~^~~~~~~~~~~~~~~ main.cpp: In function 'void eerase(int)': main.cpp:31:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<nr[poz].size();i++){ ~^~~~~~~~~~~~~~~ main.cpp: In function 'char adv()': main.cpp:73:37: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buf,sizeof(char),SIZE,fin); ^