Compilare: user.cpp: In function ‘int main()’: user.cpp:12:30: 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:13:32: 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:17:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:30:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &car); ^ user.cpp:34:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &car); ^ user.cpp:76:14: warning: ‘r2’ may be used uninitialized in this function [-Wmaybe-uninitialized] ar[r1][r2]=1; ^ user.cpp:76:14: warning: ‘r1’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:51:14: warning: ‘j2’ may be used uninitialized in this function [-Wmaybe-uninitialized] aj[j1][j2]=1; ^ user.cpp:51:14: warning: ‘j1’ may be used uninitialized in this function [-Wmaybe-uninitialized]