Compilare: user.cpp: In function ‘void read_input()’: user.cpp:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void Kruskal()’: user.cpp:63: warning: format ‘%ld’ expects type ‘long int’, but argument 2 has type ‘size_t’ user.cpp:64: warning: comparison between signed and unsigned integer expressions user.cpp:64: warning: format ‘%ld’ expects type ‘long int’, but argument 2 has type ‘int’ user.cpp:64: warning: format ‘%ld’ expects type ‘long int’, but argument 3 has type ‘int’ user.cpp: In function ‘int main()’: user.cpp:71: warning: unused variable ‘i’ user.cpp:69: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:70: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result