Compilare: user.cpp: In function ‘int main()’: user.cpp:13:26: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(i<=x && j<=y){z1+=t;if(t<mz1 && (x-i+y-j)%2==1) ^ user.cpp:20:26: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(i<=x && y<=j){z2+=t;if(t<mz2 && (x-i+j-y)%2==1) ^ user.cpp:27:26: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(x<=i && j<=y){z3+=t;if(t<mz3 && (i-x+y-j)%2==1) ^ user.cpp:35:3: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(t<mz4 && (i-x+j-y)%2==1) ^ user.cpp:6:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] {freopen("cri.in","r",stdin); ^ user.cpp:7:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cri.out","w",stdout); ^ user.cpp:8:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&n,&m,&x,&y); ^ user.cpp:12:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^