Compilare: user.cpp: In function ‘int substring(int, int)’: user.cpp:26:23: warning: unused variable ‘ans’ [-Wunused-variable] int i, q, lu, lv, ans, side; ^ user.cpp:26:28: warning: unused variable ‘side’ [-Wunused-variable] int i, q, lu, lv, ans, side; ^ user.cpp: In function ‘int main()’: user.cpp:86:40: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] for(i = 1; i <= n; i++) in >> S[i] + 1; ^ user.cpp:147:33: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] printSol((1 << n) - 1, last); ^