Compilare: main.cpp: In function 'bool ok_pref(std::pair<unsigned int, unsigned int>)': main.cpp:73:44: warning: left shift count >= width of type [-Wshift-count-overflow] len += it->first - (((ui)1) << 32); ^~ main.cpp:77:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(len < x.first + 1){ ~~~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:84:22: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&t); ^ main.cpp:87:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ main.cpp:96:42: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%u %u %u",&x,&y,&a); ^