Submission #631490

#	Time	Username	Problem	Language	Result	Execution time	Memory
631490		abc864197532	Misspelling (JOI22_misspelling)	C++17	28 / 100	4043 ms	4376 KiB

misspelling

#include <bits/stdc++.h>
using namespace std;
#define ll long long int
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define pii pair <int, int>
#define X first
#define Y second
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
void abc() {cout << endl;}
template <typename T, typename ...U> void abc(T a, U ...b) {
    cout << a << ' ', abc(b...);
}
template <typename T> void printv(T l, T r) {
    for (; l != r; ++l) cout << *l << " \n"[l + 1 == r];
}
template <typename A, typename B> istream& operator >> (istream& o, pair<A, B> &a) {
    return o >> a.X >> a.Y;
}
template <typename A, typename B> ostream& operator << (ostream& o, pair<A, B> a) {
    return o << '(' << a.X << ", " << a.Y << ')';
}
template <typename T> ostream& operator << (ostream& o, vector<T> a) {
    bool is = false;
    if (a.empty()) return o << "{}";
    for (T i : a) {o << (is ? ' ' : '{'), is = true, o << i;}
    return o << '}';
}
template <typename T> struct vv : vector <vector <T>> {
    vv (int n, int m, T v) : vector <vector <T>> (n, vector <T>(m, v)) {}
    vv (int n, int m) : vector <vector <T>> (n, vector <T>(m)) {}
    vv () {}
};
template <typename T> struct vvv : vector <vv <T>> {
    vvv (int n, int m, int k, T v) : vector <vv <T>> (n, vv <T>(m, k, v)) {}
    vvv (int n, int m, int k) : vector <vv <T>> (n, vv <T>(m, k)) {}
    vvv () {}
};
#ifdef Doludu
#define test(args...) abc("[" + string(#args) + "]", args)
#define owo freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout)
#else
#define test(args...) void(0)
#define owo ios::sync_with_stdio(false); cin.tie(0)
#endif
const int mod = 1e9 + 7, N = 200002;

void add(int &i, int j) {
    i += j;
    if (i >= mod)
        i -= mod;
}

int dp[N][29];

void solve() {
    int n, m;
    cin >> n >> m;
    vector <int> mx1(n), mx2(n);
    auto add_edge = [&](int u, int v) {
        if (u < v)
            mx1[u] = max(mx1[u], v);
        else
            mx2[v] = max(mx2[v], u);
    };
    for (int i = 0, u, v; i < m; ++i) {
        cin >> u >> v, --u, --v;
        add_edge(u, v);
    }
    // s[i - 1] < s[i]
    dp[0][0] = 1;
    for (int i = 0; i < n; ++i) {
        for (int c = 0; c < 26; ++c) {
            add(dp[i][c + 1], dp[i][c]);
        }
        // dp[i] -> dp[j];
        // s[i - 1] != s[i] -> only care range start from i

        // s[j - 1] < s[j]
        // no i -> j, i < j
        for (int c = 0; c < 26; ++c) {
            int mx = mx1[i];
            for (int j = i + 1; j < n; ++j) {
                if (mx < j) {
                    add(dp[j][c + 1], dp[i][c]);
                }
                mx = max(mx, mx1[j]);
            }
        }

        // s[j - 1] > s[j]
        // no i -> j, i > j
        for (int c = 0; c < 26; ++c) {
            int mx = mx2[i];
            for (int j = i + 1; j < n; ++j) {
                if (mx < j) {
                    add(dp[j][0], dp[i][c]);
                    add(dp[j][c], mod - dp[i][c]);
                }
                mx = max(mx, mx2[j]);
            }
        }
    }
    int ans = 0;
    for (int i = 0; i < n; ++i) for (int c = 0; c < 26; ++c) {
        add(ans, dp[i][c]);
    }
    cout << ans << '\n';
}

int main () {
    owo;
    int t = 1;
    // cin >> t;
    while (t--)
        solve();
}

• Subtask 1: 8 / 8
• Subtask 2: 20 / 20
• Subtask 3: 0 / 29
• Subtask 4: 0 / 32
• Subtask 5: 0 / 11