oj.uz

Submission #392594

# Submission time Handle Problem Language Result Execution time Memory
392594 2021-04-21T10:56:20 Z patrikpavic2 Marriage questions (IZhO14_marriage) C++17
96 / 100
 1500 ms 5256 KB 
#include <cstdio>
#include <cstring>
#include <vector>
#include <algorithm>
 
#define PB push_back
 
using namespace std;
 
typedef long long ll;
 
const int N = (1 << 15);
 
int par[N], n, m, bio[N], k, un[N], cookie = 1;
int poc[N], deg[N];
vector < int > v[N], m1[N];
 
bool dodaj(int x){
	if(bio[x] == cookie) return 0;
	bio[x] = cookie;
	while((int)m1[x].size() > 0 && (!un[m1[x].back()] || par[m1[x].back()] != -1)) 
		m1[x].pop_back();
	if((int)m1[x].size() > 0){
		int y = m1[x].back(); 
		par[x] = y; par[y] = x;
		m1[x].pop_back();
		return 1;
	}
	for(int i = poc[x];i < deg[x] && un[v[x][i]];i++){
		if(dodaj(par[v[x][i]])){
			par[x] = v[x][i]; par[v[x][i]] = x;
			return 1;
		}
	}
	return 0;
}
 
int main(){
	scanf("%d%d%d", &n, &m, &k);
	for(int i = 0;i < k;i++){
		int a, b; scanf("%d%d", &a, &b);
		a--; b--;
		v[a].PB(n + b), v[b + n].PB(a);
		deg[a]++; deg[n + b]++;
	}
	memset(par, -1, sizeof(par));
	for(int i = 0;i < m;i++){
		un[i + n] = 1;
		sort(v[i + n].begin(), v[i + n].end());
		for(int x : v[i + n]) m1[x].PB(i + n);
	}
	int r = 0, sol = 0;
	ll ans = 0;
	for(int l = 0;l < n;l++){
		if(l && sol == m){
			un[l - 1] = 0;
			for(int i = n;i < m + n;i++)
				if(poc[i] < deg[i] && v[i][poc[i]] < l) poc[i]++;
			if(par[l - 1] != -1){
				sol--; par[par[l - 1]] = -1;
				sol += dodaj(par[l - 1]); cookie++;
				if(par[par[l - 1]] == -1){
					int cnt = 0;
					for(int x : v[par[l - 1]]) {
						if(x < l) continue;
						cnt++;
						m1[x].PB(par[l - 1]);
						if(cnt > m) break;
					}
				}
			}	
		}		
		while(r < n && sol < m){
			un[r] = 1; sol += dodaj(r); cookie++;
			if(par[r] == -1){
				for(int x : v[r]) m1[x].PB(r);
			}
			r++;
		}
		ans += (n + 1 - r) * (sol == m);
	}
	printf("%lld\n", ans);
	return 0;
}

Compilation message

marriage.cpp: In function 'int main()':
marriage.cpp:39:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |  scanf("%d%d%d", &n, &m, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
marriage.cpp:41:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   41 |   int a, b; scanf("%d%d", &a, &b);
      |             ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
96.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1868 KB Output is correct
2 Correct 1 ms 1868 KB Output is correct
3 Correct 1 ms 1868 KB Output is correct
4 Correct 1 ms 1868 KB Output is correct
5 Correct 1 ms 1860 KB Output is correct
6 Correct 1 ms 1868 KB Output is correct
7 Correct 1 ms 1868 KB Output is correct
8 Correct 1 ms 1868 KB Output is correct
9 Correct 1 ms 1868 KB Output is correct
10 Correct 1 ms 1872 KB Output is correct
11 Correct 1 ms 1992 KB Output is correct
12 Correct 1 ms 1868 KB Output is correct
13 Correct 1 ms 1868 KB Output is correct
14 Correct 1 ms 1868 KB Output is correct
15 Correct 1 ms 1868 KB Output is correct
16 Correct 1 ms 1868 KB Output is correct
17 Correct 1 ms 1868 KB Output is correct
18 Correct 1 ms 1872 KB Output is correct
19 Correct 3 ms 1996 KB Output is correct
20 Correct 2 ms 1868 KB Output is correct
21 Correct 2 ms 1868 KB Output is correct
22 Correct 1 ms 1868 KB Output is correct
23 Correct 2 ms 1868 KB Output is correct
24 Correct 2 ms 1868 KB Output is correct
25 Correct 14 ms 2264 KB Output is correct
26 Correct 5 ms 1996 KB Output is correct
27 Correct 2 ms 1996 KB Output is correct
28 Correct 1 ms 1868 KB Output is correct
29 Correct 8 ms 2124 KB Output is correct
30 Correct 7 ms 2124 KB Output is correct
31 Correct 107 ms 2944 KB Output is correct
32 Correct 19 ms 2120 KB Output is correct
33 Correct 2 ms 1996 KB Output is correct
34 Correct 2 ms 1996 KB Output is correct
35 Correct 133 ms 3736 KB Output is correct
36 Correct 99 ms 3532 KB Output is correct
37 Correct 295 ms 3268 KB Output is correct
38 Correct 175 ms 4328 KB Output is correct
39 Correct 17 ms 2252 KB Output is correct
40 Correct 9 ms 2636 KB Output is correct
41 Correct 90 ms 2904 KB Output is correct
42 Correct 230 ms 3264 KB Output is correct
43 Correct 268 ms 3464 KB Output is correct
44 Correct 718 ms 4388 KB Output is correct
45 Correct 91 ms 3908 KB Output is correct
46 Execution timed out 1593 ms 5256 KB Time limit exceeded
47 Correct 1202 ms 5196 KB Output is correct
48 Correct 1198 ms 5060 KB Output is correct
49 Execution timed out 1584 ms 5256 KB Time limit exceeded
50 Correct 52 ms 2500 KB Output is correct