Compilare: user.cpp: In function ‘int main()’: user.cpp:87:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<pos.size();i++) ^ user.cpp:80:9: warning: unused variable ‘cnt’ [-Wunused-variable] int cnt=0; ^ user.cpp:69:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&(A[i][j])); ^