izo.cpp: In function 'void DFS(int, int)': izo.cpp:29: warning: comparison between signed and unsigned integer expressions izo.cpp:35: warning: comparison between signed and unsigned integer expressions izo.cpp: In function 'void unire(int, int)': izo.cpp:45: warning: comparison between signed and unsigned integer expressions izo.cpp: In function 'int main()': izo.cpp:49: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result izo.cpp:50: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result izo.cpp:51: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result izo.cpp:53: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result izo.cpp:57: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result