Compilare: user.cpp: In function ‘int main()’: user.cpp:30:63: warning: suggest parentheses around comparison in operand of ‘^’ [-Wparentheses] if(a[i-1][j-1]^a[i-1][j+m-1]^a[i+m-1][j-1]==0&&j+m-1<=m1&&i+m-1<=n)ls=m; ^ user.cpp:35:63: warning: suggest parentheses around comparison in operand of ‘^’ [-Wparentheses] if(a[i-1][j-1]^a[i-1][j+m-1]^a[i+m-1][j-1]==x&&j+m-1<=m1&&i+m-1<=n)ls=m; ^ user.cpp:6:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sah3.in","r",stdin); ^ user.cpp:7:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sah3.out","w",stdout); ^ user.cpp:8:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&n,&m1); ^ user.cpp:14:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^