Compilare: user.cpp: In function ‘bool check(int)’: user.cpp:8:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<mat[poz].size()&&f[mat[poz][i]]==0) ^ user.cpp:8:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(i<mat[poz].size()&&f[mat[poz][i]]==0) ^ user.cpp:10:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return i<mat[poz].size(); ^ user.cpp: In function ‘int main()’: user.cpp:27:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<mat[ist].size();j++) ^ user.cpp:28:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[mat[ist][j]]=1; ^ user.cpp:17:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&n); ^ user.cpp:20:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&k); ^ user.cpp:23:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&x); ^