Compilare: user.cpp: In function ‘int main()’: user.cpp:17:33: 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:18:35: 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:20:29: 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:27:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c", &a); ^ user.cpp:43:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("\n"); ^ user.cpp:79:17: warning: ‘yj’ may be used uninitialized in this function [-Wmaybe-uninitialized] c[1].col= yj; ^ user.cpp:78:17: warning: ‘xj’ may be used uninitialized in this function [-Wmaybe-uninitialized] c[1].lin= xj; ^ user.cpp:52:17: warning: ‘yr’ may be used uninitialized in this function [-Wmaybe-uninitialized] c[1].col= yr; ^ user.cpp:51:17: warning: ‘xr’ may be used uninitialized in this function [-Wmaybe-uninitialized] c[1].lin= xr; ^