Submission #712568

#	Time	Username	Problem	Language	Result	Execution time	Memory
712568		GrindMachine	Misspelling (JOI22_misspelling)	C++17	28 / 100	4074 ms	20688 KiB

misspelling

// Om Namah Shivaya

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x, y) ((x + y - 1) / (y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i, n) for(int i = 0; i < n; ++i)
#define rep1(i, n) for(int i = 1; i <= n; ++i)
#define rev(i, s, e) for(int i = s; i >= e; --i)
#define trav(i, a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a, b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a, b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*



*/

const int MOD = 1e9 + 7;
const int N = 5e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

ll dp[N][26], pref[N][26];

void solve(int test_case)
{
    ll n, m; cin >> n >> m;
    vector<array<ll, 3>> a(m);
    rep(i, m) {
        ll l, r; cin >> l >> r;
        ll t = 0;
        if (l > r) {
            swap(l, r);
            t = 1;
        }
        a[i] = {t, l, r - 1};
    }

    rep(ch, 26) {
        dp[1][ch] = 1;
        pref[1][ch] = 1;
    }

    for (int i = 2; i <= n; ++i) {
        ll mx_les = 0, mx_mor = 0;

        rep(j, m) {
            auto [t, l, r] = a[j];
            if (l < i and r >= i - 1) {
                if (t == 0) {
                    amax(mx_les, l);
                }
                else {
                    amax(mx_mor, l);
                }
            }
        }

        rep(ch1, 26) {
            auto &val = dp[i][ch1];
            rep(ch2, 26) {
                if (ch2 == ch1) {
                    // val += pref[i - 1][ch2];
                }
                else if (ch2 < ch1) {
                    val += pref[i - 1][ch2] - pref[mx_les][ch2];
                }
                else {
                    val += pref[i - 1][ch2] - pref[mx_mor][ch2];
                }
            }

            val = (val % MOD + MOD) % MOD;
        }

        rep(ch, 26) {
            pref[i][ch] = (pref[i - 1][ch] + dp[i][ch]) % MOD;
        }
    }

    // rep1(i, n) {
    //     rep(ch, 5) {
    //         cout << pref[i][ch] << " ";
    //     }
    //     cout << endl;
    // }

    ll ans = 0;
    rep(ch, 26) ans = (ans + pref[n][ch]) % MOD;

    cout << ans << endl;

    /*

    ll dp[n + 5][n + 5][26];
    memset(dp, 0, sizeof dp);
    rep(ch, 26) {
    dp[1][1][ch] = 1;
    }

    rep1(i, n - 1) {
    rep1(p, i) {
    ll les = 0, mor = 0;
    rep(j, m) {
    auto [t, l, r] = a[j];
    if (l >= p and l <= i) {
    if (r >= i) {
    if (t == 0) les++;
    else mor++;
    }
    }
    }

    rep(ch1, 26) {
    if (!dp[i][p][ch1]) conts;
    rep(ch2, 26) {
    if (ch2 < ch1 and !mor) {
    dp[i + 1][i + 1][ch2] = (dp[i + 1][i + 1][ch2] + dp[i][p][ch1]) % MOD;
    }

    if (ch2 == ch1) {
    dp[i + 1][p][ch2] = (dp[i + 1][p][ch2] + dp[i][p][ch1]) % MOD;
    }

    if (ch2 > ch1 and !les) {
    dp[i + 1][i + 1][ch2] = (dp[i + 1][i + 1][ch2] + dp[i][p][ch1]) % MOD;
    }
    }
    }
    }
    }

    ll ans = 0;

    rep1(p, n) {
    rep(ch, 26) {
    ans = (ans + dp[n][p][ch]) % MOD;
    }
    }

    cout << ans << endl;

    */
}

int main()
{
    fastio;

    int t = 1;
    // cin >> t;

    rep1(i, t) {
        solve(i);
    }

    return 0;
}

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