Compilare: user.cpp: In function ‘void bfs()’: user.cpp:77:13: warning: unused variable ‘minval’ [-Wunused-variable] int minval = 1e9 + 1 , minadd; ^~~~~~ user.cpp:77:32: warning: unused variable ‘minadd’ [-Wunused-variable] int minval = 1e9 + 1 , minadd; ^~~~~~ user.cpp:78:14: warning: unused variable ‘r’ [-Wunused-variable] bool r = 0; ^ user.cpp:92:30: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long long int’ [-Wformat=] printf ("%d" , dp [y]); ^ user.cpp: In function ‘int parsebuff()’: user.cpp:29:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread (buffer , 1 , NM , stdin); ^ user.cpp:39:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread (buffer , 1 , NM , stdin); ^ user.cpp: In function ‘void buff()’: user.cpp:47:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(in , "r" , stdin); ^ user.cpp:48:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(out , "w" , stdout); ^ user.cpp:49:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread (buffer , 1 , NM , stdin); ^