/in/foo.cc: In function 'int main()':
/in/foo.cc:36:25: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
       l[i][j] |= 1 << k - 1;
                       ~~^~~
/in/foo.cc:41:18: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
    f[i | (1 << k - 1)] = min(f[i | (1 << k - 1)], f[i] + 1);
                ~~^~~
/in/foo.cc:41:44: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
    f[i | (1 << k - 1)] = min(f[i | (1 << k - 1)], f[i] + 1);
                                          ~~^~~