/in/foo.cc: In function 'int main()':
/in/foo.cc:27:54: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
    maxn[i][j] = max(maxn[i][j - 1], maxn[i + (1 << j - 1)][j - 1]);
                                                    ~~^~~
/in/foo.cc:28:54: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
    minn[i][j] = min(minn[i][j - 1], minn[i + (1 << j - 1)][j - 1]);
                                                    ~~^~~