arbore1.cpp: In function 'void DFS(int, int)': arbore1.cpp:42: warning: comparison between signed and unsigned integer expressions arbore1.cpp:51: warning: comparison between signed and unsigned integer expressions arbore1.cpp: In function 'int main()': arbore1.cpp:64: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result arbore1.cpp:65: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result arbore1.cpp:66: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result arbore1.cpp:68: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result