Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:67: warning: comparison between signed and unsigned integer expressions user.cpp:78: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:131: warning: comparison between signed and unsigned integer expressions user.cpp:137: warning: comparison between signed and unsigned integer expressions user.cpp:91: warning: unused variable ‘p’ user.cpp:91: warning: unused variable ‘q’ user.cpp:93: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:95: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result