Compilare: user.cpp: In function ‘void DFS1(int, int)’: user.cpp:52: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void DFS2(int, int)’: user.cpp:68: warning: comparison between signed and unsigned integer expressions user.cpp:77: warning: comparison between signed and unsigned integer expressions user.cpp:87: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:97: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:100: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result