Submission #1249377

#TimeUsernameProblemLanguageResultExecution timeMemory
1249377norman165Railway Trip 2 (JOI22_ho_t4)C++20
8 / 100
2098 ms589824 KiB
#include <bits/stdc++.h> #define all(x) x.begin(), x.end() #define rall(x) x.rbegin(), x.rend() #define int long long #define yes() cout << "YES\n" #define no() cout << "NO\n" using namespace std; using ll = long long; using ull = unsigned long long; using ld = long double; const int inf = 1e18; const int mod = 1e9 + 7; const int maxn = 1e7 + 5e6; const int mod1 = 998244353; const int mod2 = 1e18 + 1; const int mod3 = 1e9 + 9; const int mod4 = 333333333; const int mod5 = 200000; const int mod6 = 10007; const int k = 300; const int w = 1e5; const ld EPS = 1e-8; int LOG = 30; struct e { int t, x; }; void solve() { int n, k; cin >> n >> k; int m; cin >> m; vector<vector<int>> dp1(n, vector<int> (n + 1, inf)); vector<vector<int>> dp2(n, vector<int> (n + 1, -inf)); vector<vector<e>> queries1(n), queries2(n); for (int i = 0; i < m; i++) { int l, r; cin >> l >> r; l--, r--; if (l <= r) { queries1[l].push_back({1, inf}); if (min(l + k - 1, r) + 1 < n) queries1[min(l + k - 1, r) + 1].push_back({2, inf}); queries2[l].push_back({1, r}); if (min(l + k - 1, r) + 1 < n) queries2[min(l + k - 1, r) + 1].push_back({2, r}); } else { queries1[max(r, l - k + 1)].push_back({1, r}); if (l + 1 < n) queries1[l + 1].push_back({2, r}); queries2[max(r, l - k + 1)].push_back({1, -inf}); if (l + 1 < n) queries2[l + 1].push_back({2, -inf}); } } multiset<int> prime; for (int i = 0; i < n; i++) { for (auto& j : queries1[i]) { if (j.t == 1) { prime.insert(j.x); } else { prime.extract(j.x); } } if (prime.empty()) continue; int l = *prime.begin(); if (prime.count(inf)) l = min(l, i); dp1[i][1] = l; } prime.clear(); for (int i = 0; i < n; i++) { for (auto& j : queries2[i]) { if (j.t == 1) { prime.insert(j.x); } else { prime.extract(j.x); } } if (prime.empty()) continue; int l = *prime.rbegin(); if (prime.count(-inf)) l = max(l, i); dp2[i][1] = l; } for (int i = 2; i <= n; i++) { for (int j1 = 0; j1 < n; j1++) { for (int j2 = dp1[j1][i - 1]; j2 <= dp2[j1][i - 1]; j2++) { dp1[j1][i] = min(dp1[j1][i], dp1[j2][1]); dp2[j1][i] = max(dp2[j1][i], dp2[j2][1]); } } } int q; cin >> q; while (q--) { int s, t; cin >> s >> t; s--, t--; int ans = -1; for (int i = 1; i <= n; i++) { if (dp1[s][i] <= t && t <= dp2[s][i]) { ans = i; break; } } cout << ans << "\n"; } } signed main() { // cout.precision(16); ios::sync_with_stdio(false); cin.tie(nullptr); int t = 1; // cin >> t; while (t--) { solve(); } }
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