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#pragma once
#include <functional>
#include <ranges>
template <std::ranges::random_access_range Range>
void group(const Range &v, const std::function<void(int, int)> &fn) {
int n = v.size();
for (int i = 0; i < n;) {
auto i0 = i;
while (i < n && v[i0] == v[i]) {
i++;
}
fn(i0, i);
}
}
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