結果
問題 | No.1123 Afforestation |
ユーザー | 0w1 |
提出日時 | 2020-12-30 14:20:08 |
言語 | C++17 (gcc 12.3.0 + boost 1.83.0) |
結果 |
WA
|
実行時間 | - |
コード長 | 3,644 bytes |
コンパイル時間 | 2,836 ms |
コンパイル使用メモリ | 230,300 KB |
実行使用メモリ | 102,272 KB |
最終ジャッジ日時 | 2024-10-07 13:59:14 |
合計ジャッジ時間 | 27,535 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
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テストケース
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ソースコード
#include <bits/stdc++.h> using namespace std; template<typename T = int, T INF = 0x3f3f3f3f> struct EKarp { int n; vector<vector<T>> capacity; vector<vector<int>> adj; EKarp(int _n) : n(_n), capacity(_n, vector<T>(_n)), adj(_n) {} void addEdge(T w, int u, int v) { adj[u].push_back(v); adj[v].push_back(u); capacity[u][v] += w; } T bfs(int s, int t, vector<int> &parent) { fill(parent.begin(), parent.end(), -1); parent[s] = -2; queue<pair<int, int>> que; que.push({ s, INF }); while (que.size()) { auto [cur, flow] = que.front(); que.pop(); for (int nxt : adj[cur]) { if (parent[nxt] == -1 && capacity[cur][nxt]) { parent[nxt] = cur; T nflow = min(flow, capacity[cur][nxt]); if (nxt == t) return nflow; que.push({ nxt, nflow }); } } } return (T) 0; } T maxflow(int s, int t) { T flow = 0; vector<int> parent(n); T nflow; while (nflow = bfs(s, t, parent)) { flow += nflow; int cur = t; while (cur != s) { int pre = parent[cur]; capacity[pre][cur] -= nflow; capacity[cur][pre] += nflow; cur = pre; } } return flow; } }; int main() { ios::sync_with_stdio(false); int H, W; { cin >> H >> W; } vector<int> A(H); { for (int i = 0; i < H; ++i) cin >> A[i]; } vector<int> B(W); { for (int i = 0; i < W; ++i) cin >> B[i]; } int K; { cin >> K; } vector<int> X(K), Y(K); { for (int i = 0; i < K; ++i) cin >> X[i] >> Y[i], --X[i], --Y[i]; } set<pair<int, int>> badBag; { for (int i = 0; i < K; ++i) badBag.emplace(X[i], Y[i]); } EKarp ekarp(H + W + 2); { for (int i = 0; i < H; ++i) ekarp.addEdge(A[i], H + W, i); for (int i = 0; i < W; ++i) ekarp.addEdge(B[i], H + i, H + W + 1); for (int i = 0; i < H; ++i) { for (int j = 0; j < W; ++j) { int w = !badBag.count(make_pair(i, j)); ekarp.addEdge(w, i, H + j); } } } int gc = 0; { auto a = A; auto b = B; vector<int> aord(H); { iota(aord.begin(), aord.end(), 0); sort(aord.begin(), aord.end(), [&](int i, int j) { return a[i] > a[j]; }); } for (int i : aord) { vector<int> bord(W); { iota(bord.begin(), bord.end(), 0); sort(bord.begin(), bord.end(), [&](int i, int j) { return b[i] > b[j]; }); } for (int j : bord) { if (badBag.count(make_pair(i, j))) continue; if (a[i] && b[j]) { --a[i]; --b[j]; assert(ekarp.capacity[i][H + j] == 1); ekarp.capacity[i][H + j] -= 1; ekarp.capacity[H + j][i] += 1; assert(ekarp.capacity[H + W][i] > 0); ekarp.capacity[H + W][i] -= 1; ekarp.capacity[i][H + W] += 1; assert(ekarp.capacity[H + j][H + W + 1] > 0); ekarp.capacity[H + j][H + W + 1] -= 1; ekarp.capacity[H + W + 1][H + j] += 1; ++gc; } } } } int sumA = accumulate(A.begin(), A.end(), 0); int sumB = accumulate(B.begin(), B.end(), 0); cout << sumA << endl; int mf = ekarp.maxflow(H + W, H + W + 1); if (gc + mf != max(sumA, sumB)) { cout << ":(" << endl; } else { cout << "Yay!" << endl; vector<string> res(H, string(W, '.')); { for (int i = 0; i < K; ++i) { res[X[i]][Y[i]] = 'x'; } for (int i = 0; i < H; ++i) { for (int j = 0; j < W; ++j) { if (ekarp.capacity[H + j][i] == 1) res[i][j] = 'o'; } } } for (int i = 0; i < H; ++i) cout << res[i] << "\n"; } }