Compilare: main.cpp: In function 'int main()': main.cpp:61:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<desc[x].size();j++) ~^~~~~~~~~~~~~~~ main.cpp:71:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int a=0;a<desc[nr].size();a++) ~^~~~~~~~~~~~~~~~ main.cpp:118:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int a=0;a<desc[nr].size();a++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'void read()': main.cpp:12:47: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, sizeof(char), BUFF_SIZE, file); ^