Compilare: user.cpp: In function ‘void findline()’: user.cpp:33:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<A[i].size();j++) ^ user.cpp: In function ‘void solve()’: user.cpp:80:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<A[i].size();j++) ^ user.cpp: In function ‘void findline()’: user.cpp:41:14: warning: ‘line’ may be used uninitialized in this function [-Wmaybe-uninitialized] x[line]=1; ^ user.cpp: In function ‘void findcolumn()’: user.cpp:62:16: warning: ‘column’ may be used uninitialized in this function [-Wmaybe-uninitialized] y[column]=1; ^