結果
問題 | No.5020 Averaging |
ユーザー | e869120 |
提出日時 | 2024-02-19 23:58:50 |
言語 | C++14 (gcc 12.3.0 + boost 1.83.0) |
結果 |
AC
|
実行時間 | 841 ms / 1,000 ms |
コード長 | 4,232 bytes |
コンパイル時間 | 1,389 ms |
コンパイル使用メモリ | 100,988 KB |
実行使用メモリ | 6,676 KB |
スコア | 82,145,377 |
最終ジャッジ日時 | 2024-02-25 12:35:30 |
合計ジャッジ時間 | 46,047 ms |
ジャッジサーバーID (参考情報) |
judge12 / judge14 |
純コード判定しない問題か言語 |
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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 | 838 ms
6,676 KB |
testcase_01 | AC | 840 ms
6,676 KB |
testcase_02 | AC | 839 ms
6,676 KB |
testcase_03 | AC | 839 ms
6,676 KB |
testcase_04 | AC | 841 ms
6,676 KB |
testcase_05 | AC | 840 ms
6,676 KB |
testcase_06 | AC | 839 ms
6,676 KB |
testcase_07 | AC | 839 ms
6,676 KB |
testcase_08 | AC | 839 ms
6,676 KB |
testcase_09 | AC | 839 ms
6,676 KB |
testcase_10 | AC | 838 ms
6,676 KB |
testcase_11 | AC | 839 ms
6,676 KB |
testcase_12 | AC | 838 ms
6,676 KB |
testcase_13 | AC | 841 ms
6,676 KB |
testcase_14 | AC | 839 ms
6,676 KB |
testcase_15 | AC | 839 ms
6,676 KB |
testcase_16 | AC | 838 ms
6,676 KB |
testcase_17 | AC | 838 ms
6,676 KB |
testcase_18 | AC | 839 ms
6,676 KB |
testcase_19 | AC | 838 ms
6,676 KB |
testcase_20 | AC | 838 ms
6,676 KB |
testcase_21 | AC | 840 ms
6,676 KB |
testcase_22 | AC | 841 ms
6,676 KB |
testcase_23 | AC | 839 ms
6,676 KB |
testcase_24 | AC | 839 ms
6,676 KB |
testcase_25 | AC | 839 ms
6,676 KB |
testcase_26 | AC | 840 ms
6,676 KB |
testcase_27 | AC | 838 ms
6,676 KB |
testcase_28 | AC | 840 ms
6,676 KB |
testcase_29 | AC | 839 ms
6,676 KB |
testcase_30 | AC | 839 ms
6,676 KB |
testcase_31 | AC | 841 ms
6,676 KB |
testcase_32 | AC | 839 ms
6,676 KB |
testcase_33 | AC | 838 ms
6,676 KB |
testcase_34 | AC | 838 ms
6,676 KB |
testcase_35 | AC | 838 ms
6,676 KB |
testcase_36 | AC | 840 ms
6,676 KB |
testcase_37 | AC | 839 ms
6,676 KB |
testcase_38 | AC | 841 ms
6,676 KB |
testcase_39 | AC | 838 ms
6,676 KB |
testcase_40 | AC | 838 ms
6,676 KB |
testcase_41 | AC | 838 ms
6,676 KB |
testcase_42 | AC | 838 ms
6,676 KB |
testcase_43 | AC | 839 ms
6,676 KB |
testcase_44 | AC | 840 ms
6,676 KB |
testcase_45 | AC | 839 ms
6,676 KB |
testcase_46 | AC | 840 ms
6,676 KB |
testcase_47 | AC | 838 ms
6,676 KB |
testcase_48 | AC | 839 ms
6,676 KB |
testcase_49 | AC | 839 ms
6,676 KB |
ソースコード
#include <iostream> #include <cmath> #include <vector> #include <algorithm> using namespace std; const long long Target = 500000000000000000LL; void Operation(vector<long long>& A, vector<long long>& B, int idx1, int idx2) { long long avg1 = (A[idx1] + A[idx2]) / 2LL; long long avg2 = (B[idx1] + B[idx2]) / 2LL; A[idx1] = avg1; B[idx1] = avg2; A[idx2] = avg1; B[idx2] = avg2; } long long BinarySearch(int N, vector<long long> X, vector<int> Order) { long long cl = 0; long long cr = Target * 2LL; long long cm; for (int i = 0; i < 65; i++) { cm = (cl + cr) / 2LL; vector<long long> Y = X; Y[Order[N - 10]] = cm; vector<long long> Z = X; Z[Order[N - 10]] = cm; for (int j = N - 11; j >= 0; j--) Operation(Y, Z, Order[j], Order[j + 1]); if (Y[0] >= Target) cr = cm; else cl = cm; } return cm; } int main() { // Step 1. 入力 vector<long long> A(50, 0); vector<long long> B(50, 0); long long N; cin >> N; for (int i = 0; i < N; i++) cin >> A[i] >> B[i]; // Step 2. 最初のステップ long long MinV = (1LL << 60); long long MinID = -1; for (int i = 1; i < N; i++) { long long v1 = (A[0] + A[i]) / 2LL; long long v2 = (B[0] + B[i]) / 2LL; long long err = max(abs(v1 - Target), abs(v2 - Target)); if (MinV > err) { MinV = err; MinID = i; } } Operation(A, B, 0, MinID); // Step 3. ランダム貪欲 vector<int> MinOrder; int StartTime = clock(); long long RecordScore = Target; while (clock() - StartTime < 4 * CLOCKS_PER_SEC / 10) { vector<long long> C = A; vector<long long> D = B; long long RemainC = Target * 2 - C[0]; long long RemainD = Target * 2 - D[0]; vector<bool> Used(N, false); vector<int> Order; Order.push_back(0); // 貪欲法スタート while (true) { vector<pair<long long, int>> Vec; for (int i = 1; i < N; i++) { if (Used[i] == true) continue; long long v1 = abs(RemainC - C[i]); if (v1 >= RemainC) continue; long long v2 = abs(RemainD - D[i]); if (v2 >= RemainD) continue; Vec.push_back(make_pair(max(v1, v2), i)); } sort(Vec.begin(), Vec.end()); if (Vec.size() == 0) break; int idx = Vec[rand() % max(1, min(3, (int)Vec.size() / 3))].second; RemainC = min(6LL * Target, 2LL * RemainC - C[idx]); RemainD = min(6LL * Target, 2LL * RemainD - D[idx]); Order.push_back(idx); Used[idx] = true; } for (int i = 1; i < N; i++) { if (Used[i] == false) Order.push_back(i); } // スコアを出す vector<pair<int, int>> CurrentAns; CurrentAns.push_back(make_pair(0, MinID)); for (int i = N - 2; i >= 0; i--) { CurrentAns.push_back(make_pair(Order[i], Order[i + 1])); Operation(C, D, Order[i], Order[i + 1]); } // スコアを比較 long long CandScore = max(abs(Target - C[0]), abs(Target - D[0])); if (RecordScore > CandScore) { RecordScore = CandScore; MinOrder = Order; } } // Step 4. 二分探索 long long BaseA = BinarySearch(N, A, MinOrder); long long BaseB = BinarySearch(N, B, MinOrder); // Step 5. 指数探索 long long BestScore = (1LL << 60); vector<int> LastOrder; vector<int> BestOrder; for (int i = N - 10; i < N; i++) LastOrder.push_back(MinOrder[i]); sort(LastOrder.begin(), LastOrder.end()); do { vector<long long> C = A; vector<long long> D = B; for (int i = LastOrder.size() - 2; i >= 0; i--) Operation(C, D, LastOrder[i], LastOrder[i + 1]); long long err_c = abs(BaseA - C[LastOrder[0]]); long long err_d = abs(BaseB - D[LastOrder[0]]); long long score = max(err_c, err_d); if (BestScore > score) { BestScore = score; BestOrder = LastOrder; } } while (next_permutation(LastOrder.begin(), LastOrder.end())); // Step 6. 答えを得る vector<pair<int, int>> Answer; vector<int> FinalOrder; for (int i = 0; i < N - 10; i++) FinalOrder.push_back(MinOrder[i]); for (int idx : BestOrder) FinalOrder.push_back(idx); Answer.push_back(make_pair(0, MinID)); for (int i = FinalOrder.size() - 2; i >= 0; i--) { Answer.push_back(make_pair(FinalOrder[i], FinalOrder[i + 1])); Operation(A, B, FinalOrder[i], FinalOrder[i + 1]); } // Step 7. 出力 cout << Answer.size() << endl; for (int i = 0; i < Answer.size(); i++) cout << Answer[i].first + 1 << " " << Answer[i].second + 1 << endl; return 0; }