제출 #1082724

#제출 시각아이디문제언어결과실행 시간메모리
1082724Tymond3단 점프 (JOI19_jumps)C++17
46 / 100
284 ms87892 KiB
#include <bits/stdc++.h> using namespace std; using ll = long long; using ld = long double; #define fi first #define se second #define vi vector<int> #define vll vector<long long> #define pii pair<int, int> #define pll pair<long long, long long> #define pb push_back #define mp make_pair #define eb emplace_back #define all(x) (x).begin(), (x).end() #define sz(x) (int)(x).size() mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); mt19937_64 rng64(chrono::steady_clock::now().time_since_epoch().count()); inline int rand(int l,int r){return uniform_int_distribution<int>(l, r)(rng);} inline ll rand(ll l,ll r){return uniform_int_distribution<ll>(l, r)(rng64);} #ifdef DEBUG auto&operator<<(auto&o,pair<auto,auto>p){return o<<"("<<p.first<<", "<<p.second<<")";} auto operator<<(auto&o,auto x)->decltype(x.end(),o){o<<"{";int i=0;for(auto e:x)o<<","+!i++<<e;return o<<"}";} #define debug(X...)cerr<<"["#X"]: ",[](auto...$){((cerr<<$<<"; "),...)<<endl;}(X) #else #define debug(...){} #endif struct custom_hash { static uint64_t splitmix64(uint64_t x) { x += 0x9e3779b97f4a7c15; x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9; x = (x ^ (x >> 27)) * 0x94d049bb133111eb; return x ^ (x >> 31); } size_t operator()(uint64_t x) const { static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count(); return splitmix64(x + FIXED_RANDOM); } }; pii bigger(pii x, pii y){ if(x.fi != y.fi){ return (x.fi > y.fi ? x : y); } return x; } const int MAXN = 5e5 + 7; const int MAXK = 22; const int BASE = (1 << 19); int a[MAXN]; pii tree[2 * BASE + 7]; int lg[4 * MAXN]; int m[MAXK][MAXN]; ll best[MAXN]; vector<pii> queries[MAXN]; ll ans[MAXN]; int n, q; void init(){ for(int i = 1; i <= n; i++){ tree[i + BASE] = {a[i], i}; } for(int i = BASE - 1; i >= 1; i--){ tree[i] = bigger(tree[2 * i], tree[2 * i + 1]); } /*lg[1] = 0; for(int i = 2; i < MAXN; i++){ lg[i] = lg[i / 2] + 1; } for(int i = 1; i <= n; i++){ m[0][i] = a[i]; } for(int j = 1; j < MAXK; j++){ for(int i = 1; i <= n; i++){ m[j][i] = max(m[j - 1][i], m[j - 1][min(n, i + (1 << (j - 1)))]); } }*/ } int getMx(int l, int p){ if(p < l){ return 0; } return max(m[lg[p - l + 1]][l], m[lg[p - l + 1]][p - (1 << lg[p - l + 1]) + 1]); } void upd(int ind, pii val){ ind += BASE; tree[ind] = val; ind /= 2; while(ind > 0){ tree[ind] = bigger(tree[2 * ind], tree[2 * ind + 1]); ind /= 2; } } int x, y; pii query(int v, int l, int p){ if(p < x || y < l){ return {0, 0}; } if(x <= l && p <= y){ return tree[v]; } int mid = (l + p) / 2; return bigger(query(2 * v, l, mid), query(2 * v + 1, mid + 1, p)); } ll bestRes(int l, int p){ ll ret = 0LL; if(l + 1 < p){ ret = (ll)a[l] + a[p] + getMx(l + 1, l + (p - l) / 2); } if(l > 1){ ret = max(ret, (ll)a[l] + a[p] + getMx(max(1, l - (p - l)), l - 1)); } if(p + (p - l) <= n){ ret = max(ret, (ll)a[l] + a[p] + getMx(p + (p - l), n)); } return ret; } ll solve(int l, int p){ x = l; y = p; int k = min(22, p - l + 1); vi vec; for(int i = 0; i < k; i++){ pii akt = query(1, 0, BASE - 1); vec.pb(akt.se); upd(akt.se, {0, akt.se}); } sort(all(vec)); for(int i = 0; i < k; i++){ upd(vec[i], {a[vec[i]], vec[i]}); } ll res = 0; for(int i = 0; i < k; i++){ int akt = vec[i]; for(int j = l; j <= p; j++){ if(j == akt){ continue; } res = max(res, bestRes(min(j, akt), max(j, akt))); } } return res; } int main(){ ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); cin >> n; for(int i = 1; i <= n; i++){ cin >> a[i]; } lg[1] = 0; for(int i = 2; i < MAXN; i++){ lg[i] = lg[i / 2] + 1; } for(int i = 1; i <= n; i++){ m[0][i] = a[i]; } for(int j = 1; j < MAXK; j++){ for(int i = 1; i <= n; i++){ m[j][i] = max(m[j - 1][i], m[j - 1][min(n, i + (1 << (j - 1)))]); } } cin >> q; for(int i = 1; i <= q; i++){ int l, p; cin >> l >> p; queries[p].pb({l, i}); } if(n <= 5000){ for(int i = 3; i <= n; i++){ sort(all(queries[i])); pii akt = (sz(queries[i]) == 0 ? mp(0, 0) : queries[i].back()); for(int j = i - 2; j >= 1; j--){ best[j] = max(best[j], max(best[j + 1], (ll)a[j] + a[i] + getMx(j + 1, j + (i - j) / 2))); // cout << i << ' ' << j << ' ' << best[j] << '\n'; while(akt.fi == j){ ans[akt.se] = best[j]; if(sz(queries[i])){ queries[i].pop_back(); akt = (sz(queries[i]) == 0 ? mp(0, 0) : queries[i].back()); } } } } for(int i = 1; i <= q; i++){ cout << ans[i] << '\n'; } return 0; } init(); cout << solve(1, n) << '\n'; return 0; }
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