Submission #952424

#TimeUsernameProblemLanguageResultExecution timeMemory
952424EJIC_B_KEDAXMisspelling (JOI22_misspelling)C++17
100 / 100
783 ms72360 KiB
#ifdef LOCAL #define _GLIBCXX_DEBUG #endif #include <bits/stdc++.h> #ifndef LOCAL // #pragma GCC optimize("O3") // #pragma GCC optimize("Ofast") // #pragma GCC optimize("unroll-loops") // #pragma GCC target("avx,avx2,bmi,bmi2,popcnt,lzcnt") #endif using namespace std; using ll = long long; using ld = long double; #define x first #define y second #define all(x) x.begin(), x.end() #define rall(x) x.rbegin(), x.rend() mt19937_64 mt(time(0)); void solve(); void init(); int32_t main() { #ifndef LOCAL cin.tie(nullptr)->sync_with_stdio(false); #endif cout << fixed << setprecision(30); init(); int t = 1; // cin >> t; while (t--) { solve(); } } const int LG = 19, N = 1 << LG, A = 26, mod = 1000000007; int to_up[N], to_down[N], dp[N][A]; int add(int a, int b) { return a + b >= mod ? a + b - mod : a + b; } int sub(int a, int b) { return a >= b ? a - b : a - b + mod; } int mul(int a, int b) { return 1ll * a * b % mod; } int bin_pow(int a, int x) { int res = 1; while (x) { if (x & 1) { res = mul(res, a); } a = mul(a, a); x >>= 1; } return res; } struct segment_tree { vector<int> st; int size; segment_tree(int sz = N) { size = sz; st.resize(2 * size, -1); } void update(int l, int r, int v) { l += size; r += size; while (l <= r) { if (l & 1) { st[l] = max(st[l], v); l++; } if (~r & 1) { st[r] = max(st[r], v); r--; } l >>= 1; r >>= 1; } } int get(int i) { i += size; int res = -1; while (i) { res = max(st[i], res); i >>= 1; } return res; } }; void init() {} void solve() { int n, m; cin >> n >> m; segment_tree stl, str; for (int i = 0; i < m; i++) { int a, b; cin >> a >> b; a--; b--; if (a < b) { str.update(a + 1, b, a); } else { stl.update(b + 1, a, b); } } for (int i = 0; i < n; i++) { to_up[i] = stl.get(i); to_down[i] = str.get(i); } for (int i = 0; i < A; i++) { dp[0][i] = 1; } // for (int i = 0; i < n; i++) { // cout << to_up[i] << ' '; // } // cout << '\n'; // for (int i = 0; i < n; i++) { // cout << to_down[i] << ' '; // } // cout << '\n'; for (int i = 1; i < n; i++) { for (int j = 0; j < A; j++) { int up = 0, down = 0, plate = 0, anywhere = 0; if (to_up[i] != -1) { up = dp[to_up[i]][j]; } if (to_down[i] != -1) { down = dp[to_down[i]][j]; } if (to_up[i] > to_down[i]) { plate = down; } else { plate = up; } anywhere = sub(dp[i - 1][j], sub(add(up, down), plate)); // cout << i << ' ' << j << ' ' << plate << ' ' << up << ' ' << down << ' ' << anywhere << '\n'; up = sub(up, plate); down = sub(down, plate); for (int l = 0; l < A; l++) { dp[i][l] = add(dp[i][l], anywhere); if (l <= j) { dp[i][l] = add(dp[i][l], down); } if (l >= j) { dp[i][l] = add(dp[i][l], up); } if (l == j) { dp[i][l] = add(dp[i][l], plate); } } } } int ans = 0; // for (int i = 0; i < n; i++) { // for (int j = 0; j < A; j++) { // cout << dp[i][j] << ' '; // } // cout << '\n'; // } for (int i = 0; i < A; i++) { ans = add(ans, dp[n - 1][i]); } cout << ans << '\n'; // cout << sub(bin_pow(A, n), ans) << '\n'; }
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