Compilare: main.cpp: In function 'void Read()': main.cpp:18:9: warning: unused variable 'i' [-Wunused-variable] int i,X,Y; ^ main.cpp: In function 'void Solve()': main.cpp:53:11: warning: unused variable 'n' [-Wunused-variable] int i,n,Node; ^ main.cpp: In function 'void Displaying()': main.cpp:76:43: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] fprintf(g,"%d ",ctc[srt[i]].size()); ^ main.cpp:77:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<ctc[srt[i]].size();++j) ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void Read()': main.cpp:19:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&N,&M); ^ main.cpp:23:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&X,&Y); ^