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Submission #362036

# Submission time Handle Problem Language Result Execution time Memory
362036 2021-02-01T15:36:32 Z dolphingarlic Necklace (Subtask 4) (BOI19_necklace4) C++14
15 / 15
 378 ms 748 KB 
#include <bits/stdc++.h>
typedef long long ll;
using namespace std;

int p1[6002], p2[6002];

void fill_p(string s, int *p) {
    for (int i = 1; i < s.size(); i++) {
        int j = p[i - 1];
        while (j && s[i] != s[j]) j = p[j - 1];
        if (s[i] == s[j]) j++;
        p[i] = j;
    }
}

tuple<int, int, int> solve(string s, string t, bool rev) {
    int n = s.size(), m = t.size();
    tuple<int, int, int> ans = {0, 0, 0};
    for (int i = 0; i < n; i++) {
        string s1 = s.substr(0, i), s2 = s.substr(i, n - i);
        reverse(s1.begin(), s1.end());
        string t1 = t, t2 = t;
        reverse(t2.begin(), t2.end());
        fill_p(s1 + "#" + t1, p1), fill_p(s2 + "#" + t2, p2);
        for (int j = 1; j <= m; j++)
            ans = max(ans, {
                p1[i + j] + p2[n + m - i - j],
                i - p1[i + j],
                rev ? m - j - p2[n + m - i - j] : j - p1[i + j]
            });
    }
    return ans;
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    string s, t;
    cin >> s >> t;
    tuple<int, int, int> ans = solve(s, t, false);
    reverse(t.begin(), t.end());
    ans = max(ans, solve(s, t, true));
    cout << get<0>(ans) << '\n' << get<1>(ans) << ' ' << get<2>(ans);
    return 0;
}

Compilation message

necklace.cpp: In function 'void fill_p(std::string, int*)':
necklace.cpp:8:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |     for (int i = 1; i < s.size(); i++) {
      |                     ~~^~~~~~~~~~

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 356 ms 620 KB Output is correct
2 Correct 302 ms 556 KB Output is correct
3 Correct 378 ms 748 KB Output is correct
4 Correct 299 ms 620 KB Output is correct
5 Correct 217 ms 640 KB Output is correct
6 Correct 258 ms 620 KB Output is correct
7 Correct 267 ms 492 KB Output is correct
8 Correct 300 ms 620 KB Output is correct
9 Correct 317 ms 748 KB Output is correct