Compilare: user.cpp:6: warning: non-local variable ‘<anonymous struct> a [65025]’ uses anonymous type user.cpp: In function ‘void unite(int, int)’: user.cpp:17: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:31: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:34: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:37: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:40: warning: suggest explicit braces to avoid ambiguous ‘else’ user.cpp:21: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:22: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result