/in/foo.cc: In function 'int check1(int, int, int, int)':
/in/foo.cc:27:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
         if(l==x)l++;if(r==x)r--;
         ^~
/in/foo.cc:27:21: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
         if(l==x)l++;if(r==x)r--;
                     ^~
/in/foo.cc: In function 'int dfs(int, int, int)':
/in/foo.cc:58:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
             int mid=l+r>>1;
                     ~^~
/in/foo.cc:70:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
             int mid=l+r>>1;
                     ~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:98:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         int mid=l+r>>1;
                 ~^~