/in/foo.cc: In function 'void pre()':
/in/foo.cc:40:35: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
    f[i][j]=min(f[i][j-1],f[i+(1<<j-1)][j-1]);
                                  ~^~
/in/foo.cc:41:35: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
    g[i][j]=gcd(g[i][j-1],g[i+(1<<j-1)][j-1]);
                                  ~^~