Compilare: user.cpp: In function ‘int solve()’: user.cpp:31:32: warning: suggest parentheses around comparison in operand of ‘^’ [-Wparentheses] if (a[i][j]^a[1][j]!=a[i][1]^a[1][1]) fl=false; ^ user.cpp: In function ‘void print()’: user.cpp:50:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<c.size() &&i<l.size();i++) ^ user.cpp:50:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<c.size() &&i<l.size();i++) ^ user.cpp:53:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<c.size();i++) ^ user.cpp:56:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<l.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:61:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("becuri.in","r",stdin); ^ user.cpp:62:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("becuri.out","w",stdout); ^ user.cpp:65:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&n,&m); ^ user.cpp:68:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d",&a[i][j]); ^