oj.uz

Submission #345340

# Submission time Handle Problem Language Result Execution time Memory
345340 2021-01-07T07:44:44 Z maskoff Marriage questions (IZhO14_marriage) C++14
72 / 100
 1500 ms 25492 KB 
#include <bits/stdc++.h>

#define file ""

#define all(x) x.begin(), x.end()

#define sc second
#define fr first

#define pb push_back
#define mp make_pair

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

const ll inf = 1e18 + 5;
const ll mod = 1e9 + 7;

const int N = 5e5 + 5;

int dx[] = {+1, 0, -1, 0};
int dy[] = {0, +1, 0, -1};


int n, m, k, timer;
int used[N], mt[N], pr[N], s[N];
vector<int> g[N], all[N];

bool go(int v) {
	if (used[v] == timer) return false;
	used[v] = timer;

 	for (int i = s[v]; i < g[v].size(); i++) {
  	int to = g[v][i];
 		if (mt[to] == false) {
 		 	mt[to] = v;
 		 	pr[v] = to;
 		 	return true;
 		}
 	}
 	  
 	for (int i = s[v]; i < g[v].size(); i++) {
 		int to = g[v][i];
		if (go(mt[to])) {
		 	mt[to] = v;
		 	pr[v] = to;
		 	return true;
		}
	}

	return false;
}

bool check(int y, int p) {
	fill (pr + 1, pr + 1 + m, false);

	for (int j : all[p])
		g[j].pb(p);
	
	for (int i = 1; i <= m; i++) {
		timer++;
		go(i);
	}
	
	int ok = true;
	for (int i = 1; i <= m; i++) 
		if (pr[i] == 0) ok = false;
		else mt[pr[i]] = false;
	
	return ok;
}

void clear(int x) {
 	for (int j : all[x])	
 		s[j]++;
}                   

int main() {  
	ios_base :: sync_with_stdio(false);               
	cin.tie(nullptr);
	srand(time(nullptr));
	cin >> n >> m >> k;
	for (int x, y, i = 1; i <= k; i++) {
		cin >> x >> y;
	 	all[x].pb(y);
	}
	ll res = 0;
	int last = m;
	int j = 1;
	for (int i = 1; i <= n; i++) {
		int p = check(i, j);
		while (j < n && !p) {
			j++;
			if (j == n + 1) break;
			p = check(i, j);
	 	}
	 	//cerr << i << " " << j << endl;
	 	if (j == n + 1) break;
	 	if (p) res += n - j + 1;
	 	else break;
	 	clear(i);
	}
	cout << res;
  return 0;              
}

Compilation message

marriage.cpp: In function 'bool go(int)':
marriage.cpp:35:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |   for (int i = s[v]; i < g[v].size(); i++) {
      |                      ~~^~~~~~~~~~~~~
marriage.cpp:44:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |   for (int i = s[v]; i < g[v].size(); i++) {
      |                      ~~^~~~~~~~~~~~~
marriage.cpp: In function 'int main()':
marriage.cpp:90:6: warning: unused variable 'last' [-Wunused-variable]
   90 |  int last = m;
      |      ^~~~

Subtask #1
72.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 17 ms 23820 KB Output isn't correct
2 Correct 20 ms 23788 KB Output is correct
3 Correct 18 ms 23936 KB Output is correct
4 Correct 17 ms 23788 KB Output is correct
5 Correct 16 ms 23788 KB Output is correct
6 Correct 20 ms 23788 KB Output is correct
7 Incorrect 18 ms 23788 KB Output isn't correct
8 Correct 23 ms 23788 KB Output is correct
9 Correct 19 ms 23788 KB Output is correct
10 Correct 16 ms 23788 KB Output is correct
11 Correct 18 ms 23788 KB Output is correct
12 Correct 18 ms 23788 KB Output is correct
13 Incorrect 17 ms 23788 KB Output isn't correct
14 Correct 17 ms 23788 KB Output is correct
15 Incorrect 18 ms 23792 KB Output isn't correct
16 Correct 17 ms 23828 KB Output is correct
17 Correct 18 ms 23904 KB Output is correct
18 Correct 17 ms 23788 KB Output is correct
19 Incorrect 19 ms 23916 KB Output isn't correct
20 Incorrect 16 ms 23916 KB Output isn't correct
21 Correct 16 ms 23788 KB Output is correct
22 Correct 17 ms 23788 KB Output is correct
23 Correct 17 ms 23916 KB Output is correct
24 Correct 16 ms 23916 KB Output is correct
25 Incorrect 64 ms 24044 KB Output isn't correct
26 Incorrect 28 ms 23916 KB Output isn't correct
27 Correct 15 ms 23916 KB Output is correct
28 Correct 18 ms 23916 KB Output is correct
29 Correct 19 ms 23916 KB Output is correct
30 Correct 18 ms 23916 KB Output is correct
31 Execution timed out 1575 ms 24404 KB Time limit exceeded
32 Correct 388 ms 24100 KB Output is correct
33 Correct 24 ms 23916 KB Output is correct
34 Correct 33 ms 23916 KB Output is correct
35 Correct 238 ms 25136 KB Output is correct
36 Correct 168 ms 25068 KB Output is correct
37 Execution timed out 1591 ms 24300 KB Time limit exceeded
38 Correct 78 ms 25136 KB Output is correct
39 Correct 630 ms 24300 KB Output is correct
40 Correct 553 ms 24172 KB Output is correct
41 Correct 768 ms 24424 KB Output is correct
42 Correct 184 ms 24524 KB Output is correct
43 Correct 205 ms 24668 KB Output is correct
44 Correct 354 ms 25060 KB Output is correct
45 Execution timed out 1593 ms 24980 KB Time limit exceeded
46 Execution timed out 1516 ms 25104 KB Time limit exceeded
47 Correct 754 ms 25492 KB Output is correct
48 Correct 671 ms 25324 KB Output is correct
49 Execution timed out 1598 ms 24940 KB Time limit exceeded
50 Execution timed out 1597 ms 24236 KB Time limit exceeded