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:151: warning: comparison between signed and unsigned integer expressions user.cpp:164: 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:184: warning: comparison between signed and unsigned integer expressions user.cpp:201: warning: comparison between signed and unsigned integer expressions user.cpp:208: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:238: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:241: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:245: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result