Compilare: main.cpp: In function 'void bkt(int, long long int)': main.cpp:23:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<bl[k].size();j++) ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:17: warning: unused variable 'mask' [-Wunused-variable] long long mask=0; ^~~~ main.cpp:36:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&nrt); ^ main.cpp:40:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&m); ^ main.cpp:43:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&x,&y); ^