foo.cc: In function 'int build(int, int, int, int)':
foo.cc:31:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int mid=l+r>>1;
           ~^~
foo.cc: In function 'int find(int, int, int, int, int)':
foo.cc:40:42: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int now=sumv[le[u2]]-sumv[le[u1]],mid=l+r>>1;
                                         ~^~
foo.cc: In function 'int main()':
foo.cc:56:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
    mid=l+r>>1;
        ~^~

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