centru.cpp: In function 'void read()': centru.cpp:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result centru.cpp:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result centru.cpp:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result centru.cpp: In function 'void dfs(int)': centru.cpp:43: warning: comparison between signed and unsigned integer expressions centru.cpp: In function 'void rezolva(int)': centru.cpp:60: warning: comparison between signed and unsigned integer expressions centru.cpp: In function 'int main()': centru.cpp:94: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result centru.cpp:95: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result