Compilare: user.cpp: In function ‘int main()’: user.cpp:49:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rj.in", "r", stdin); ^ user.cpp:50:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rj.out", "w", stdout); ^ user.cpp:54:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &n, &m); ^ user.cpp:58:18: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s+1); ^ user.cpp:77:19: warning: ‘jy’ may be used uninitialized in this function [-Wmaybe-uninitialized] bfs(jx, jy, 1); ^ user.cpp:77:19: warning: ‘jx’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:70:19: warning: ‘ry’ may be used uninitialized in this function [-Wmaybe-uninitialized] bfs(rx, ry, 0); ^ user.cpp:70:19: warning: ‘rx’ may be used uninitialized in this function [-Wmaybe-uninitialized] /tmp/ccLqr4LZ.o: In function `main': user.cpp:(.text.startup+0x88): warning: the `gets' function is dangerous and should not be used.