Compilare: user.cpp: In function ‘void read()’: user.cpp:5:28: warning: integer overflow in expression [-Woverflow] #define UNEXPLORED (1<<31)-1 ^ user.cpp:63:12: note: in expansion of macro ‘UNEXPLORED’ d[i][j]=UNEXPLORED, scanf("%c \n", forest[i]+j); ^ user.cpp:56:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("padure.in", "r", stdin); ^ user.cpp:57:92: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d %d %d\n", &n, &m, &start.line, &start.column, &stop.line, &stop.column); ^ user.cpp:63:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] d[i][j]=UNEXPLORED, scanf("%c \n", forest[i]+j); ^ user.cpp: In function ‘void write()’: user.cpp:70:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("padure.out", "w", stdout); ^