Compilare: user.cpp: In function ‘void graf()’: user.cpp:83: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void back(int)’: user.cpp:146: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void find_tour()’: user.cpp:170: warning: comparison between signed and unsigned integer expressions user.cpp:173: warning: comparison between signed and unsigned integer expressions user.cpp:178: warning: comparison between signed and unsigned integer expressions user.cpp:185: warning: comparison between signed and unsigned integer expressions user.cpp:192: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:219: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:222: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:226: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result