結果

問題 No.1479 Matrix Eraser
ユーザー Aoxiang CuiAoxiang Cui
提出日時 2021-10-06 23:01:50
言語 C++14
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 540 ms / 3,000 ms
コード長 6,013 bytes
コンパイル時間 1,866 ms
コンパイル使用メモリ 141,392 KB
実行使用メモリ 22,784 KB
最終ジャッジ日時 2024-07-23 03:02:21
合計ジャッジ時間 13,148 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge2
このコードへのチャレンジ
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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 8 ms
14,848 KB
testcase_01 AC 9 ms
14,932 KB
testcase_02 AC 9 ms
14,848 KB
testcase_03 AC 10 ms
14,848 KB
testcase_04 AC 9 ms
14,848 KB
testcase_05 AC 9 ms
14,976 KB
testcase_06 AC 8 ms
14,976 KB
testcase_07 AC 74 ms
15,744 KB
testcase_08 AC 124 ms
16,504 KB
testcase_09 AC 242 ms
17,988 KB
testcase_10 AC 427 ms
20,160 KB
testcase_11 AC 281 ms
18,360 KB
testcase_12 AC 92 ms
16,000 KB
testcase_13 AC 125 ms
16,444 KB
testcase_14 AC 98 ms
16,000 KB
testcase_15 AC 28 ms
15,232 KB
testcase_16 AC 106 ms
16,128 KB
testcase_17 AC 507 ms
21,304 KB
testcase_18 AC 510 ms
21,248 KB
testcase_19 AC 511 ms
21,248 KB
testcase_20 AC 510 ms
21,120 KB
testcase_21 AC 509 ms
21,120 KB
testcase_22 AC 509 ms
21,120 KB
testcase_23 AC 509 ms
21,120 KB
testcase_24 AC 505 ms
21,248 KB
testcase_25 AC 506 ms
21,116 KB
testcase_26 AC 512 ms
21,120 KB
testcase_27 AC 166 ms
17,996 KB
testcase_28 AC 164 ms
18,176 KB
testcase_29 AC 164 ms
18,048 KB
testcase_30 AC 164 ms
18,176 KB
testcase_31 AC 166 ms
18,048 KB
testcase_32 AC 72 ms
21,288 KB
testcase_33 AC 76 ms
21,324 KB
testcase_34 AC 72 ms
21,384 KB
testcase_35 AC 74 ms
21,464 KB
testcase_36 AC 73 ms
21,408 KB
testcase_37 AC 29 ms
17,076 KB
testcase_38 AC 173 ms
17,152 KB
testcase_39 AC 540 ms
22,784 KB
testcase_40 AC 9 ms
14,848 KB
権限があれば一括ダウンロードができます
コンパイルメッセージ
main.cpp: In function 'int main()':
main.cpp:203:16: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
  203 |     for (auto& [x, y] : pos[k]) {
      |                ^
main.cpp:212:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
  212 |     for (auto [x, y] : pos[k]) {
      |               ^

ソースコード

diff # 

#define LOCAL
#define _USE_MATH_DEFINES
#include <array>
#include <cassert>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <iomanip>
#include <string>
#include <sstream>
#include <vector>
#include <queue>
#include <stack>
#include <list>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <algorithm>
#include <complex>
#include <cmath>
#include <numeric>
#include <bitset>
#include <functional>
#include <random>
#include <ctime>

using namespace std;

template <typename A, typename B>
ostream& operator <<(ostream& out, const pair<A, B>& a) {
  out << "(" << a.first << "," << a.second << ")";
  return out;
}
template <typename T, size_t N>
ostream& operator <<(ostream& out, const array<T, N>& a) {
  out << "["; bool first = true;
  for (auto& v : a) { out << (first ? "" : ", "); out << v; first = 0;} out << "]";
  return out;
}
template <typename T>
ostream& operator <<(ostream& out, const vector<T>& a) {
  out << "["; bool first = true;
  for (auto v : a) { out << (first ? "" : ", "); out << v; first = 0;} out << "]";
  return out;
}
template <typename T, class Cmp>
ostream& operator <<(ostream& out, const set<T, Cmp>& a) {
  out << "{"; bool first = true;
  for (auto& v : a) { out << (first ? "" : ", "); out << v; first = 0;} out << "}";
  return out;
}
template <typename U, typename T, class Cmp>
ostream& operator <<(ostream& out, const map<U, T, Cmp>& a) {
  out << "{"; bool first = true;
  for (auto& p : a) { out << (first ? "" : ", "); out << p.first << ":" << p.second; first = 0;} out << "}";
  return out;
}
#ifdef LOCAL
#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)
#else
#define trace(...) 42
#endif
template <typename Arg1>
void __f(const char* name, Arg1&& arg1){
  cerr << name << ": " << arg1 << endl;
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args){
  const char* comma = strchr(names + 1, ',');
  cerr.write(names, comma - names) << ": " << arg1 << " |";
  __f(comma + 1, args...);
}

template <class T> auto vect(const T& v, int n) { return vector<T>(n, v); }
template <class T, class... D> auto vect(const T& v, int n, D... m) {
  return vector<decltype(vect(v, m...))>(n, vect(v, m...));
}

typedef long long int64;
typedef pair<int, int> ii;
#define SZ(x) (int)((x).size())
template <typename T> static constexpr T inf = numeric_limits<T>::max() / 2;
const int MOD = 1e9 + 7;
// const int MOD = 998244353;
mt19937 mrand(random_device{}());
int rnd(int x) { return mrand() % x; }
// mt19937_64 mrand(random_device{}());
// int64 rnd(int64 x) { return mrand() % x; }
template <class T> void out(const vector<T>& a) { for (int i = 0; i < SZ(a); ++i) cout << a[i] << " \n"[i + 1 == SZ(a)]; }
template <class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template <class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
template <class T> void dedup(vector<T>& v) { sort(v.begin(), v.end()); v.erase(unique(v.begin(), v.end()), v.end()); }
void add(int& x, int y) { x += y; if (x >= MOD) x -= MOD; }

struct fast_ios {
  fast_ios() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
  };
} fast_ios_;

template<size_t N, typename T=int>
struct maxflow {
  struct Edge {
    int v, dual;
    T c;
    Edge(int v, int dual, T c) : v(v), dual(dual), c(c) {}
  };
  vector<Edge> a[N];
  typename vector<Edge>::iterator idx[N];
  int d[N];

  void add_edge(int u, int v, int c, bool bidirection = false) {
    a[u].emplace_back(v, SZ(a[v]), c);
    a[v].emplace_back(u, SZ(a[u]) - 1, bidirection ? c : 0);
  }
  T augment(int u, int t, T bound) {
    if (u == t) return bound;
    T ret = 0;
    // current arc optimization
    for (auto& it = idx[u]; it != a[u].end() && ret < bound; ++it) {
      if (it->c && d[it->v] == d[u] + 1) {
        T aug = augment(it->v, t, min(it->c, bound - ret));
        ret += aug;
        it->c -= aug;
        a[it->v][it->dual].c += aug;
      }
    }
    if (ret == 0) d[u] = -1;
    return ret;
  }
  int n;
  bool path(int s, int t) {
    fill(d, d + n, -1);
    d[s] = 0;
    queue<int> Q;
    Q.push(s);
    while (!Q.empty()) {
      int u = Q.front();
      Q.pop();
      for (auto& p : a[u]) {
        if (p.c && d[p.v] == -1) {
          Q.push(p.v);
          d[p.v] = d[u] + 1;
          if (p.v == t) return true;
        }
      }
    }
    return false;
  }
  maxflow(int n) {
    this->n = n;
    for (int i = 0; i < n; ++i) a[i].clear();
  }
  T dinic(int s, int t) {
    T ret = 0;
    while (path(s, t)) {
      // current arc optimization
      for (int i = 0; i < n; ++i) idx[i] = a[i].begin();
      while (T aug = augment(s, t, inf<T>)) {
        ret += aug;
      }
    }
    return ret;
  }
  vector<int> reach(int s) {
    vector<int> Q;
    Q.push_back(s);
    vector<bool> visit(n);
    visit[s] = true;
    for (int k = 0; k < SZ(Q); ++k) {
      int u = Q[k];
      for (auto& p : a[u]) {
        if (p.c && !visit[p.v]) {
          visit[p.v] = true;
          Q.push_back(p.v);
        }
      }
    }
    return Q;
  }
};

int main() {
  int n, m;
  cin >> n >> m;
  const int K = 5e5 + 10;
  vector<vector<array<int, 2>>> pos(K);
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < m; ++j) {
      int x;
      cin >> x;
      pos[x].push_back({i, j});
    }
  }

  int ret = 0;
  for (int k = K - 1; k > 0; --k) {
    if (SZ(pos[k]) == 0) continue;
    map<int, int> row, col;
    for (auto& [x, y] : pos[k]) {
      if (!row.count(x)) row[x] = SZ(row);
      if (!col.count(y)) col[y] = SZ(col);
    }
    const int N = 1e3 + 10;
    maxflow<N> flow(SZ(row) + SZ(col) + 2);
    int s = SZ(row) + SZ(col), t = s + 1;
    for (int i = 0; i < SZ(row); ++i) flow.add_edge(s, i, 1);
    for (int i = 0; i < SZ(col); ++i) flow.add_edge(SZ(row) + i, t, 1);
    for (auto [x, y] : pos[k]) {
      flow.add_edge(row[x], SZ(row) + col[y], 1);
    }
    ret += flow.dinic(s, t);
  }
  cout << ret << '\n';
  return 0;
}
0