oj.uz

Submission #711318

# Submission time Handle Problem Language Result Execution time Memory
711318 2023-03-16T15:00:29 Z LeMur Marriage questions (IZhO14_marriage) C++14
100 / 100
 439 ms 3284 KB 
///////////////////////////////    _LeMur_
#define _CRT_SECURE_NO_WARNINGS
#include <unordered_map>
#include <unordered_set>
#include <algorithm>
#include <iostream>
#include <cstring>
#include <cassert>
#include <chrono>
#include <random>
#include <bitset>
#include <cstdio>
#include <vector>
#include <string>
#include <stack>
#include <tuple>
#include <queue>
#include <ctime>
#include <cmath>
#include <list>
#include <map>
#include <set>

using namespace std;

const int N = 50005;
const int inf = 1000 * 1000 * 1000;
const int mod = 998244353;
// mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
mt19937 myrand(1337);

int n, m, k;
vector <int> g[N];

bool used[N];
int mt[N];

bool kuhn(int v, int L, int R) {
  if (used[v]) return false;
  used[v] = true;
  for (int i = 0; i < (int)g[v].size(); i++) {
    int to = g[v][i];
    if (to < L) continue;
    if (to > R) break;
    if (mt[to] == -1 || kuhn(mt[to], L, R)) {
      mt[to] = v;
      return true;
    }
  }
  return false;
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);

  cin >> n >> m >> k;

  for (int i = 1; i <= k; i++) {
    int a, b;
    cin >> a >> b;
    a += m;
    g[a].push_back(b);
    g[b].push_back(a);
  }

  for (int i = 1; i <= m; i++) {
    sort(g[i].begin(), g[i].end());
  }

  int ina = m, inb = n, ind = -1;
  while (ina <= inb) {
    int mid = (ina + inb) / 2;

    for (int i = 1; i <= mid; i++) {
      mt[i + m] = -1;
    }

    int cnt = 0;
    for (int i = 1; i <= m; i++) {
      for (int j = 1; j <= m; j++) {
        used[j] = false;
      }
      bool flag = kuhn(i, 1, mid + m);
      if (flag) ++cnt;
    }

    if (cnt == m) {
      ind = mid;
      inb = mid - 1;
    } else {
      ina = mid + 1;
    }
  }

  if (ind == -1) {
    cout << 0 << endl;
    return 0;
  }

  for (int i = 1; i <= n; i++) {
    mt[i + m] = -1;
  }

  for (int i = 1; i <= m; i++) {
    for (int j = 1; j <= m; j++) {
      used[j] = false;
    }
    kuhn(i, 1 + m, ind + m);
  }

  int answ = n - ind + 1;

  for (int i = 1; i <= n; i++) {
    if (mt[i + m] == -1) {
      answ += n - ind + 1;
      continue;
    }

    int girl = mt[i + m];
    while (ind <= n) {
      for (int j = 1; j <= m; j++) {
        used[j] = false;
      }
      bool flag = kuhn(girl, i + 1 + m, ind + m);
      if (flag) break;
      ++ind;
    }
    
    if (ind == n + 1) break;
    answ += n - ind + 1;
  }
  
  cout << answ << endl;
  return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1492 KB Output is correct
2 Correct 1 ms 1492 KB Output is correct
3 Correct 1 ms 1492 KB Output is correct
4 Correct 1 ms 1492 KB Output is correct
5 Correct 1 ms 1492 KB Output is correct
6 Correct 1 ms 1492 KB Output is correct
7 Correct 1 ms 1492 KB Output is correct
8 Correct 1 ms 1568 KB Output is correct
9 Correct 1 ms 1492 KB Output is correct
10 Correct 1 ms 1492 KB Output is correct
11 Correct 1 ms 1492 KB Output is correct
12 Correct 2 ms 1492 KB Output is correct
13 Correct 1 ms 1492 KB Output is correct
14 Correct 1 ms 1492 KB Output is correct
15 Correct 1 ms 1492 KB Output is correct
16 Correct 1 ms 1492 KB Output is correct
17 Correct 1 ms 1492 KB Output is correct
18 Correct 1 ms 1492 KB Output is correct
19 Correct 2 ms 1492 KB Output is correct
20 Correct 2 ms 1492 KB Output is correct
21 Correct 1 ms 1492 KB Output is correct
22 Correct 1 ms 1492 KB Output is correct
23 Correct 1 ms 1492 KB Output is correct
24 Correct 1 ms 1492 KB Output is correct
25 Correct 16 ms 1644 KB Output is correct
26 Correct 3 ms 1492 KB Output is correct
27 Correct 1 ms 1404 KB Output is correct
28 Correct 1 ms 1492 KB Output is correct
29 Correct 3 ms 1556 KB Output is correct
30 Correct 2 ms 1492 KB Output is correct
31 Correct 118 ms 2124 KB Output is correct
32 Correct 6 ms 1620 KB Output is correct
33 Correct 1 ms 1492 KB Output is correct
34 Correct 15 ms 1576 KB Output is correct
35 Correct 80 ms 2600 KB Output is correct
36 Correct 51 ms 2568 KB Output is correct
37 Correct 370 ms 2372 KB Output is correct
38 Correct 21 ms 2812 KB Output is correct
39 Correct 296 ms 1804 KB Output is correct
40 Correct 5 ms 1748 KB Output is correct
41 Correct 12 ms 1876 KB Output is correct
42 Correct 8 ms 2132 KB Output is correct
43 Correct 11 ms 2212 KB Output is correct
44 Correct 19 ms 2652 KB Output is correct
45 Correct 13 ms 2456 KB Output is correct
46 Correct 183 ms 3192 KB Output is correct
47 Correct 22 ms 3068 KB Output is correct
48 Correct 24 ms 3028 KB Output is correct
49 Correct 277 ms 3284 KB Output is correct
50 Correct 439 ms 1804 KB Output is correct