Compilare: user.cpp: In function ‘int main()’: user.cpp:59:24: warning: unused variable ‘m’ [-Wunused-variable] int n = nextnum(), m = nextnum(), edges = nextnum(); ^ user.cpp: In function ‘char nextch()’: user.cpp:13:39: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, BUF_SIZE, 1, fi); ^