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55 lines
1.4 KiB
55 lines
1.4 KiB
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auto subsequence_boundary(auto start, auto end,auto pred) {
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using live_iterator = decltype(start);
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using distance_t = std::invoke_result_t<decltype(std::distance<live_iterator>), live_iterator, decltype(end)>;
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distance_t distance = std::distance(start, end);
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if(distance < 1) {
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return start;
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}
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if(distance == 1) {
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return ++start;
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}
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live_iterator next = start;
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++next;
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while(not pred(*start, *next)) {
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++start;
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++next;
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if(next == end) return next;
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}
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return next;
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}
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auto longest_matching_subsequence(auto start, auto end, auto pred) {
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using live_iterator = decltype(start);
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using distance_t = std::invoke_result_t<decltype(std::distance<live_iterator>), live_iterator, decltype(end)>;
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live_iterator current = start;
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struct {
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live_iterator best_s;
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live_iterator best_e;
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} results;
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results.best_s = start;
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results.best_e = start;
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distance_t best_length = 0;
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while(current != end) {
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live_iterator next = subsequence_boundary(current, end, pred);
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distance_t subsequence_length = std::distance(current, next);
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if(subsequence_length > best_length) {
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results.best_s = current;
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results.best_e = next;
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best_length = subsequence_length;
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}
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current = next;
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}
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return results;
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}
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TEST_CASE("Subsequence") {
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std::vector<int> list = {0,1,2,3,4,5,0,1,0,2,5,8,7};
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auto [s,e] = longest_matching_subsequence(list.begin(), list.end(), std::greater<int>{});
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REQUIRE(std::distance(s,e) == 6);
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}
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