Compilare: user.cpp: In function ‘void graf()’: user.cpp:87: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void back(int)’: user.cpp:150: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void find_tour()’: user.cpp:174: warning: comparison between signed and unsigned integer expressions user.cpp:177: warning: comparison between signed and unsigned integer expressions user.cpp:182: warning: comparison between signed and unsigned integer expressions user.cpp:189: warning: comparison between signed and unsigned integer expressions user.cpp:196: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:226: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:229: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:233: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result