ro.cpp: In function 'void DFS(int, int)': ro.cpp:47: warning: comparison between signed and unsigned integer expressions ro.cpp: In function 'void BiconexDP(int, int)': ro.cpp:67: warning: comparison between signed and unsigned integer expressions ro.cpp:70: warning: comparison between signed and unsigned integer expressions ro.cpp:73: warning: comparison between signed and unsigned integer expressions ro.cpp:76: warning: comparison between signed and unsigned integer expressions ro.cpp: In function 'void CriticalDP(int, int)': ro.cpp:102: warning: comparison between signed and unsigned integer expressions ro.cpp:107: warning: comparison between signed and unsigned integer expressions ro.cpp: In function 'void TraceBiconex(int, int)': ro.cpp:124: warning: comparison between signed and unsigned integer expressions ro.cpp:127: warning: comparison between signed and unsigned integer expressions ro.cpp:149: warning: comparison between signed and unsigned integer expressions ro.cpp:150: warning: suggest explicit braces to avoid ambiguous 'else' ro.cpp: In function 'void TraceCritical(int, int, int)': ro.cpp:160: warning: comparison between signed and unsigned integer expressions ro.cpp:163: warning: comparison between signed and unsigned integer expressions ro.cpp:176: warning: comparison between signed and unsigned integer expressions ro.cpp:179: warning: comparison between signed and unsigned integer expressions ro.cpp: In function 'int main()': ro.cpp:208: warning: comparison between signed and unsigned integer expressions ro.cpp:186: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ro.cpp:187: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ro.cpp:189: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result ro.cpp:191: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result ro.cpp:195: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result