Compilare: user.cpp: In function ‘void graf()’: user.cpp:89: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void back(int)’: user.cpp:152: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void find_tour()’: user.cpp:176: warning: comparison between signed and unsigned integer expressions user.cpp:186: warning: comparison between signed and unsigned integer expressions user.cpp:202: warning: comparison between signed and unsigned integer expressions user.cpp:209: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:239: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:242: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:246: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result