Compilare: main.cpp: In function 'void Add()': main.cpp:37:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<ctc.size();++i) sol.push_back(ctc[i]); ~^~~~~~~~~~~ main.cpp: In function 'void Solve()': main.cpp:52:16: warning: variable 'o' set but not used [-Wunused-but-set-variable] int i,Node,o,w; ^ main.cpp:52:18: warning: variable 'w' set but not used [-Wunused-but-set-variable] int i,Node,o,w; ^ main.cpp: In function 'void Displaying()': main.cpp:72:32: 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\n",sol.size()); ^ main.cpp:73:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol.size();++i)fprintf(g,"%d ",sol[i]); ~^~~~~~~~~~~ main.cpp: In function 'void Read()': main.cpp:14:22: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&N); ^ main.cpp:17:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&X,&Y); ^