/in/foo.cc: In function 'int main()':
/in/foo.cc:59:43: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
     gc[j][k] = __gcd(gc[k][i-1],gc[k+(1<<j-1)][j-1]);
                                          ~^~
/in/foo.cc:70:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
       int mid = l+r>>1;
                 ~^~
/in/foo.cc:90:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
       int mid = l+r>>1;
                 ~^~
/in/foo.cc:112:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
        int mid = l+r>>1;
                  ~^~
/in/foo.cc:131:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
        int mid = l+r>>1;
                  ~^~