Compilare: user.cpp: In function ‘int prev(int)’: user.cpp:12:18: warning: suggest parentheses around ‘+’ in operand of ‘&’ [-Wparentheses] return x-(x&(~x)+1); ^ user.cpp: In function ‘int next(int)’: user.cpp:15:18: warning: suggest parentheses around ‘+’ in operand of ‘&’ [-Wparentheses] return x+(x&(~x)+1); ^ user.cpp: In function ‘int main()’: user.cpp:34:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<s1.length();i++){ ^ user.cpp:38:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<s2.length();i++){ ^