Compilare: user.cpp: In function ‘void dijkstra(int, int)’: user.cpp:75:9: warning: variable ‘piter’ set but not used [-Wunused-but-set-variable] int piter, buff, ptx, len, ta, tb, tp; ^ user.cpp:77:19: warning: unused variable ‘stop’ [-Wunused-variable] double start, stop; ^ 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:150:37: 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:151:39: 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); ^