Compilare: user.cpp: In function ‘void DFS(int, int, int, int)’: user.cpp:30: warning: unused variable ‘i’ user.cpp:63: warning: unused variable ‘i’ user.cpp: In function ‘int main()’: user.cpp:116: warning: comparison between signed and unsigned integer expressions user.cpp:128: warning: comparison between signed and unsigned integer expressions user.cpp:139: warning: comparison between signed and unsigned integer expressions user.cpp:141: warning: comparison between signed and unsigned integer expressions user.cpp:99: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:100: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:102: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:105: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result