Compilare: user.cpp: In function ‘void read_input()’: user.cpp:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void Prim()’: user.cpp:48: warning: comparison between signed and unsigned integer expressions user.cpp:73: warning: format ‘%ld’ expects type ‘long int’, but argument 2 has type ‘size_t’ user.cpp:74: warning: comparison between signed and unsigned integer expressions user.cpp:74: warning: format ‘%ld’ expects type ‘long int’, but argument 2 has type ‘int’ user.cpp:74: warning: format ‘%ld’ expects type ‘long int’, but argument 3 has type ‘int’ user.cpp: In function ‘int main()’: user.cpp:81: warning: unused variable ‘i’ user.cpp:79: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:80: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result