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lcs
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| #include <iostream> | |
| #include <string> | |
| using namespace std; | |
| static ssize_t *memory = nullptr; | |
| size_t lcs(const string &s1, const std::string &s2, size_t i1, size_t i2) { | |
| if (!memory) { | |
| size_t size = (s1.size() + 1) * (s2.size() + 1); | |
| memory = new ssize_t[(s1.size() + 1) * (s2.size() + 1)]; | |
| for (size_t i = 0; i < size; ++i) { | |
| memory[i] = -1; | |
| } | |
| } | |
| size_t i = i1 * (s2.size() + 1) + i2; | |
| if (memory[i] != -1) { | |
| return memory[i]; | |
| } | |
| if (i1 == 0 || i2 == 0) { | |
| memory[i] = 0; | |
| } else if (s1[i1 - 1] == s2[i2 - 1]) { | |
| memory[i] = 1 + lcs(s1, s2, i1 - 1, i2 -1); | |
| } else { | |
| memory[i] = max(lcs(s1, s2, i1 - 1, i2), lcs(s1, s2, i1, i2 - 1)); | |
| } | |
| return memory[i]; | |
| } | |
| int main() { | |
| string s1, s2; | |
| cin >> s1; | |
| cin >> s2; | |
| cout << lcs(s1, s2, s1.size(), s2.size()) << endl; | |
| for (size_t i1 = 0; i1 <= s1.size(); ++i1) { | |
| for (size_t i2 = 0; i2 <= s2.size(); ++i2) { | |
| cout << memory[i1 * (s2.size() + 1) + i2] << ' '; | |
| } | |
| cout << endl; | |
| } | |
| return 0; | |
| } |
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