Compilare: user.cpp: In function ‘int main()’: user.cpp:16:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] mars[ch][x1][y1]++; ^ user.cpp:17:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] mars[ch][x2+1][y1]--; ^ user.cpp:18:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] mars[ch][x1][y2+1]--; ^ user.cpp:19:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] mars[ch][x2+1][y2+1]++; ^ user.cpp:7:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("rox.in","r",stdin); ^ user.cpp:8:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("rox.out","w",stdout); ^ user.cpp:9:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&u); ^ user.cpp:14:54: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%c%c",&x1,&y1,&x2,&y2,&ch,&ch); ^ user.cpp:29:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&q); ^ user.cpp:33:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^