Compilare: user.cpp: In function ‘void MST()’: user.cpp:101: warning: unused variable ‘v’ user.cpp: In function ‘int main()’: user.cpp:137: warning: comparison between signed and unsigned integer expressions user.cpp:119: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:120: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:122: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:125: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result