Eroare de compilare: user.cpp:19: warning: non-local variable ‘<anonymous struct> nodes [100000]’ uses anonymous type user.cpp: In function ‘void read_in()’: user.cpp:24: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int get_maxcol(int, edge*)’: user.cpp:56: error: ‘alloca’ was not declared in this scope