foo.cc: In function 'void segins(int&, int, int, int, int)':
foo.cc:36:15: warning: capture of variable 'tot' with non-automatic storage duration
   36 |         i = [&tot]() {
      |               ^~~
foo.cc:12:5: note: 'int tot' declared here
   12 | int tot, n, m, xsiz;
      |     ^~~
foo.cc:43:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   43 |     int mid = l + r >> 1;
      |               ~~^~~
foo.cc: In function 'int bitask(int, int, int)':
foo.cc:78:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   78 |         int mid = l + r >> 1, tmp = getleft();
      |                   ~~^~~

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