結果
問題 | No.626 Randomized 01 Knapsack |
ユーザー | Pachicobue |
提出日時 | 2017-12-16 02:14:49 |
言語 | C++17 (gcc 12.3.0 + boost 1.83.0) |
結果 |
RE
|
実行時間 | - |
コード長 | 4,826 bytes |
コンパイル時間 | 2,293 ms |
コンパイル使用メモリ | 218,644 KB |
実行使用メモリ | 461,184 KB |
最終ジャッジ日時 | 2024-05-09 09:34:06 |
合計ジャッジ時間 | 5,759 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge3 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 2 ms
6,812 KB |
testcase_01 | AC | 3 ms
6,940 KB |
testcase_02 | AC | 7 ms
8,832 KB |
testcase_03 | AC | 5 ms
6,944 KB |
testcase_04 | AC | 22 ms
24,192 KB |
testcase_05 | AC | 4 ms
6,940 KB |
testcase_06 | AC | 209 ms
223,104 KB |
testcase_07 | AC | 219 ms
230,784 KB |
testcase_08 | AC | 432 ms
461,184 KB |
testcase_09 | AC | 398 ms
431,872 KB |
testcase_10 | RE | - |
testcase_11 | RE | - |
testcase_12 | RE | - |
testcase_13 | AC | 33 ms
32,768 KB |
testcase_14 | RE | - |
testcase_15 | RE | - |
testcase_16 | RE | - |
testcase_17 | RE | - |
testcase_18 | RE | - |
testcase_19 | RE | - |
testcase_20 | RE | - |
testcase_21 | AC | 28 ms
27,776 KB |
testcase_22 | RE | - |
testcase_23 | RE | - |
testcase_24 | AC | 3 ms
6,944 KB |
ソースコード
#include <bits/stdc++.h> #define VARNAME(x) #x #define show(x) cerr << #x << " = " << x << endl using namespace std; using ll = long long; using ld = long double; template <typename T> ostream& operator<<(ostream& os, const vector<T>& v) { os << "sz:" << v.size() << "\n["; for (const auto& p : v) { os << p << ","; } os << "]\n"; return os; } template <typename S, typename T> ostream& operator<<(ostream& os, const pair<S, T>& p) { os << "(" << p.first << "," << p.second << ")"; return os; } constexpr ll MOD = (ll)1e9 + 7LL; constexpr ld PI = static_cast<ld>(3.1415926535898); template <typename T> constexpr T INF = numeric_limits<T>::max() / 10; constexpr ll W_MAX = 30000000; constexpr ll NW_MAX = 80000000; constexpr ll N_MAX = 1000; constexpr ll NVV_MAX = 30000000; int main() { cin.tie(0); ios::sync_with_stdio(false); int N; ll W; cin >> N >> W; using P = pair<ll, ll>; vector<P> p; ll wsum = 0; ll vsum = 0; for (int i = 0; i < N; i++) { ll w, v; cin >> v >> w; if (w <= W) { wsum += w; vsum += v; p.push_back(make_pair(v, w)); } } if (wsum <= W) { cout << vsum << endl; return 0; } if (N == 0) { cout << 0 << endl; return 0; } auto comp = [](const P& p1, const P& p2) { return __int128_t(p1.first) * __int128_t(p2.second) > __int128_t(p1.second) * __int128_t(p2.first); }; sort(p.begin(), p.end(), comp); N = p.size(); if (W * N < NW_MAX and W < W_MAX) { vector<ll> dp(W + 1, 0); dp[0] = 0; for (int i = 0; i < N; i++) { vector<ll> tmp(W + 1, 0); for (int j = 0; j <= W; j++) { tmp[j] = max(tmp[j], dp[j]); if (j + p[i].second <= W) { tmp[j + p[i].second] = max(tmp[j + p[i].second], dp[j] + p[i].first); } } dp = tmp; } cout << *max_element(dp.begin(), dp.end()) << endl; } else { ll cap = W; ll ans = 0; ll rest = N; ll used = 0; vector<P> res; for (used = 0; used < N and rest > N_MAX and rest * cap > NW_MAX; used++) { if (cap >= p[used].second) { rest--; cap -= p[used].second; ans += p[used].first; } else { res.push_back(p[used]); } } for (int i = used; i < N; i++) { res.push_back(p[i]); } p.clear(); p.shrink_to_fit(); if (rest * cap <= NW_MAX) { vector<ll> dp(cap + 1, 0); dp[0] = 0; for (int i = 0; i < rest; i++) { vector<ll> tmp(cap + 1, 0); for (int j = 0; j <= cap; j++) { tmp[j] = max(tmp[j], dp[j]); if (j + res[i].second <= W) { tmp[j + res[i].second] = max(tmp[j + res[i].second], dp[j] + res[i].first); } } dp = tmp; } cout << ans + *max_element(dp.begin(), dp.end()) << endl; return 0; } if (rest <= N_MAX) { ll VMAX = 0; for (const auto& e : res) { VMAX = max(VMAX, e.first); } const ll V_SMALL = (ll)sqrt(NVV_MAX / rest); const ll K = VMAX / V_SMALL; auto rescop = res; for (auto& e : rescop) { e.first = e.first / K; } ll vsum = 0; for (const auto& e : rescop) { vsum += e.first; } vector<vector<ll>> dp(rest + 1, vector<ll>(vsum + 1, INF<ll>)); dp[0][0] = 0; for (int i = 0; i < rest; i++) { for (ll j = 0; j <= vsum; j++) { if (dp[i][j] != INF<ll>) { dp[i + 1][j] = min(dp[i + 1][j], dp[i][j]); dp[i + 1][j + rescop[i].first] = min(dp[i + 1][j + rescop[i].first], dp[i][j] + rescop[i].second); } } } ll maxind = vsum; for (ll i = vsum; i >= 0; i--) { if (dp[rest][i] <= cap) { maxind = i; break; } } ll pos = maxind; for (int i = rest; i >= 1; i--) { if (dp[i][pos] != dp[i - 1][pos]) { ans += res[i - 1].first; pos -= rescop[i - 1].first; } } cout << ans << endl; return 0; } assert(false); cout << ans << endl; } return 0; }