Compilare: main.cpp: In function 'void solve()': main.cpp:85:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<pozfin[i].size();j++){ ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'char adv()': main.cpp:35:37: 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); ^