neconex.cpp: In function 'void DFS(int)': neconex.cpp:12: warning: comparison between signed and unsigned integer expressions neconex.cpp: In function 'int main()': neconex.cpp:51: warning: suggest explicit braces to avoid ambiguous 'else' neconex.cpp:56: warning: suggest explicit braces to avoid ambiguous 'else' neconex.cpp:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result neconex.cpp:18: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result neconex.cpp:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result neconex.cpp:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result neconex.cpp:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result