Submission #548236

#	Time	Username	Problem	Language	Result	Execution time	Memory
548236		jesus_coconut	Misspelling (JOI22_misspelling)	C++17	0 / 100	6 ms	4180 KiB

misspelling

#include <bits/stdc++.h>

using namespace std;

using ll = long long;
int const MOD = 1e9 + 7;

int const N = 500005;
int ogr[N], ols[N];
int isoogr[N], isools[N];

ll add(ll a, ll b) {
    return (a + b) % MOD;
}


void solve() {
    int n, m;
    cin >> n >> m;
    for (int i = 0; i < m; ++i) {
        int a, b;
        cin >> a >> b;
        if (a < b) {
            ols[a]++;
            ols[b]--;
            isools[a]++;
        } else {
            ogr[b]++;
            isoogr[b]++;
            ogr[a]--;
        }
    }
    partial_sum(ols, ols + N, ols);
    partial_sum(ogr, ogr + N, ogr);
    array<array<ll, 4>, 26> dp;
    for (int i = 0; i < 26; ++i) dp[i][0] = 1, dp[i][1] = dp[i][2] = dp[i][3] = 0;
    for (int i = 1; i < n; ++i) {
        array<array<ll, 4>, 26> pdp = dp;
        for (int j = 0; j < 26; ++j) for (int k = 0; k < 4; ++k) dp[j][k] = 0;
        for (int j = 0; j < 26; ++j) {
            if (isoogr[i] > 0) {
                pdp[j][1] = add(pdp[j][1], pdp[j][0]);
                pdp[j][0] = 0;
                pdp[j][3] = add(pdp[j][3], pdp[j][2]);
                pdp[j][2] = 0;
            }
            if (ogr[i] == 0) {
                pdp[j][0] = add(pdp[j][0], pdp[j][1]);
                pdp[j][1] = 0;
                pdp[j][2] = add(pdp[j][2], pdp[j][3]);
                pdp[j][3] = 0;
            }
            if (isools[i] > 0) {
                pdp[j][2] = add(pdp[j][2], pdp[j][0]);
                pdp[j][0] = 0;
                pdp[j][3] = add(pdp[j][3], pdp[j][1]);
                pdp[j][1] = 0;
            }
            if (ols[i] == 0) {
                pdp[j][0] = add(pdp[j][0], pdp[j][2]);
                pdp[j][2] = 0;
                pdp[j][1] = add(pdp[j][1], pdp[j][3]);
                pdp[j][3] = 0;
            }
        }
        for (int i = 0; i < 26; ++i) {
            for (int k = 0; k < 4; ++k) cerr << pdp[i][k] << ' ';
            cerr << endl;
        }
        for (int j = 0; j < 26; ++j) {
            dp[j][1] = add(dp[j][1], pdp[j][1]);
            dp[j][2] = add(dp[j][2], pdp[j][2]);
            dp[j][3] = add(dp[j][3], pdp[j][3]);
            for (int k = 0; k < 26; ++k) {
                dp[k][0] = add(dp[k][0], pdp[j][0]);
                if (k < j) {
                    dp[k][0] = add(dp[k][0], pdp[j][2]);
                } else if (k > j) {
                    dp[k][0] = add(dp[k][0], pdp[j][1]);
                }
            }
        }
    }
    for (int i = 0; i < 26; ++i) {
            for (int k = 0; k < 4; ++k) cerr << dp[i][k] << ' ';
            cerr << endl;
        }
    ll ans = 0;
    for (int i = 0; i < 26; ++i) {
        for (int k = 0; k < 4; ++k) {
            ans = add(ans, dp[i][k]);
        }
    }
    cout << ans << '\n';
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    solve();

    return 0;
}

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