Compilare: user.cpp: In function ‘char nextch()’: user.cpp:32:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buck, 1, BMAX, stdin); } ^ user.cpp: In function ‘int main()’: user.cpp:142:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nolife.in", "r", stdin); ^ user.cpp:143:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nolife.out", "w", stdout); ^ user.cpp: In function ‘void dijkstra(int, int)’: user.cpp:133:27: warning: ‘ptx’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int i = far[1][ptx]; i != -1; i = far[1][i]) ^