Compilare: user.cpp: In function ‘void graf()’: user.cpp:90: 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:165: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void find_tour()’: user.cpp:175: warning: comparison between signed and unsigned integer expressions user.cpp:180: warning: comparison between signed and unsigned integer expressions user.cpp:190: warning: comparison between signed and unsigned integer expressions user.cpp:207: warning: comparison between signed and unsigned integer expressions user.cpp:214: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:244: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:247: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:251: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result