Compilare: user.cpp: In function ‘int quickselect(int*, int, int, int)’: user.cpp:12:11: warning: unused variable ‘temp’ [-Wunused-variable] int p,temp; ^ user.cpp: In function ‘int main()’: user.cpp:47:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(s);i++) ^ user.cpp:86:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[i]>='0'&&s[i]<='9'&&i<strlen(s)) {a[k]=a[k]*10+s[i]-'0'; i++;} ^ user.cpp:95:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] i++; while(s[i]>='0'&&s[i]<='9'&&i<strlen(s)) {a[k]=a[k]*10+s[i]-'0'; i++;} ^