Compilare: user.cpp: In function ‘int main()’: user.cpp:46:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gheizere.in","r",stdin); ^ user.cpp:47:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("gheizere.out","w",stdout); ^ user.cpp:49:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m, &k); ^ user.cpp:50:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &f, &s); ^ user.cpp:97:15: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] return (x - 1) * m + y; ^ user.cpp:54:13: note: ‘x’ was declared here int x , y , r , t , d; ^ user.cpp:97:26: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] return (x - 1) * m + y; ^ user.cpp:54:17: note: ‘y’ was declared here int x , y , r , t , d; ^ user.cpp:56:33: warning: ‘r’ may be used uninitialized in this function [-Wmaybe-uninitialized] c[i] = code(x , y) * 10 + r; ^ user.cpp:57:21: warning: ‘t’ may be used uninitialized in this function [-Wmaybe-uninitialized] info[i] = t * 10 + d; ^ user.cpp:57:26: warning: ‘d’ may be used uninitialized in this function [-Wmaybe-uninitialized] info[i] = t * 10 + d; ^