nuclee.cpp: In function 'void DFS(int)': nuclee.cpp:12: warning: comparison between signed and unsigned integer expressions nuclee.cpp: In function 'void DFST(int)': nuclee.cpp:20: warning: comparison between signed and unsigned integer expressions nuclee.cpp: In function 'int main()': nuclee.cpp:26: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result nuclee.cpp:27: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result nuclee.cpp:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result nuclee.cpp:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result nuclee.cpp:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result