/in/foo.cc: In function 'void Init()':
/in/foo.cc:52:18: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   mn[i] = (i & i - 1) ? mn[i - 1] : mn[i - 1] + 1; 
                ~~^~~
/in/foo.cc:56:48: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
     st[i][j] = min(st[i][j - 1],st[i + (1 << j - 1)][j - 1]);
                                              ~~^~~