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- int get_k(int id, int l, int r, int k) {
- if (l + 1 == r) {
- return l;
- }
- int m = (l + r) / 2;
- if (k <= sums[id * 2 + 1]) {
- return get_k(id * 2 + 1, l, m, k);
- } else if (k - sums[id * 2 + 1] <= sums[id * 2 + 2]) {
- return get_k(id * 2 + 2, m, r, k - sums[id * 2 + 1]);
- } else {
- return -1;
- }
- }
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