Compilare: user.cpp: In function ‘int main()’: user.cpp:60:40: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] add(dp[i & 1][j], dp[1 - i & 1][j - 1]); ~~^~~ user.cpp:62:45: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] add(dp[i & 1][pi2[j + 1]], dp[1 - i & 1][j]); ~~^~~