Compilare: user.cpp: In function ‘bool check(int)’: user.cpp:23:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p != 0 && val[p] != x) ^ user.cpp: In function ‘void del(int)’: user.cpp:33:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x == val[lst[r]]) ^ user.cpp:39:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(urm[p] != 0 && val[urm[p]] != x) ^ user.cpp:43:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(val[urm[p]] == x) ^ user.cpp: In function ‘int main()’: user.cpp:88:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%s", v); ^ user.cpp:89:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%s", cuv); ^