Compilare: user.cpp: In function ‘int main()’: user.cpp:89:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < a[x].size(); ++j){ ^ user.cpp:64:17: warning: unused variable ‘k’ [-Wunused-variable] int i,j,x,y,k,nr,res=0; ^ user.cpp: In function ‘void Read(int&)’: user.cpp:23:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++poz==DIM) fread(buff,1,DIM,fin),poz=0; ^ user.cpp:27:51: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++poz==DIM) fread(buff,1,DIM,fin),poz=0; ^ user.cpp: In function ‘int main()’: user.cpp:66:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&N,&M); ^