Compilare: user.cpp: In function ‘int main()’: user.cpp:24:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("barbar.in", "r", stdin); ^ user.cpp:25:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("barbar.out", "w", stdout); ^ user.cpp:30:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:31:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ user.cpp:40:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ user.cpp:146:21: warning: ‘oby’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(parc[obx][oby]==INF) ^ user.cpp:146:21: warning: ‘obx’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:14:12: warning: ‘sty’ may be used uninitialized in this function [-Wmaybe-uninitialized] ret.y=y; ^ user.cpp:27:14: note: ‘sty’ was declared here int stx, sty, obx, oby; ^ user.cpp:13:12: warning: ‘stx’ may be used uninitialized in this function [-Wmaybe-uninitialized] ret.x=x; ^ user.cpp:27:9: note: ‘stx’ was declared here int stx, sty, obx, oby; ^ /tmp/cc85kw47.o: In function `main': user.cpp:(.text.startup+0x87): warning: the `gets' function is dangerous and should not be used.