oj.uz

Submission #895985

# Submission time Handle Problem Language Result Execution time Memory
895985 2023-12-31T11:02:05 Z pcc Love Polygon (BOI18_polygon) C++14
100 / 100
 117 ms 24920 KB 
#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pll pair<ll,ll>
#define pii pair<int,int>
#define fs first
#define sc second
#define tlll tuple<ll,ll,ll>

const int mxn = 1e5+10;
vector<string> all;
pair<string,string> tmp[mxn];
int n;
int arr[mxn];
vector<int> jelly[mxn];
bitset<mxn> vis,psyco;
int dp[mxn][2];
int deg[mxn];
queue<int> q;
int ans;

void dfs(int now){
	dp[now][0] = dp[now][1] = 0;
	int sh = 1e9;
	for(auto nxt:jelly[now]){
		if(psyco[nxt])continue;
		dfs(nxt);
		dp[now][0] += max(dp[nxt][0],dp[nxt][1]);
		sh = min(sh,max(dp[nxt][0],dp[nxt][1])-dp[nxt][0]);
	}
	dp[now][1] = max(dp[now][0],dp[now][0]-sh+1);
	return;
}

void calc(vector<pii> &v){
	if(v.size() == 1){
		ans -= max(v[0].fs,v[0].sc);
		return;
	}
	else if(v.size() == 2){
		int tmp = max(v[0].fs+v[1].fs+2,max(v[0].fs,v[0].sc)+max(v[1].fs,v[1].sc));
		ans -= tmp;
		return;
	}
	int re = 0;
	int dp[v.size()][2] = {};
	dp[0][1] = max(v[0].fs,v[0].sc);
	dp[0][0] = v[0].fs;
	for(int i = 1;i<v.size();i++){
		dp[i][0] = dp[i-1][1]+v[i].fs;
		dp[i][1] = max({dp[i-1][0]+v[i].fs+1,dp[i-1][1]+v[i].sc,dp[i][0]});
	}
	re = max(re,dp[v.size()-1][1]);
	v.push_back(v[0]);
	v.erase(v.begin());
	memset(dp,0,sizeof(dp));
	dp[0][1] = max(v[0].fs,v[0].sc);
	dp[0][0] = v[0].fs;
	for(int i = 1;i<v.size();i++){
		dp[i][0] = dp[i-1][1]+v[i].fs;
		dp[i][1] = max({dp[i-1][0]+v[i].fs+1,dp[i-1][1]+v[i].sc,dp[i][0]});
	}
	re = max(re,dp[v.size()-1][1]);
	ans -= re;
}

int main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin>>n;
	for(int i =0;i<n;i++){
		cin>>tmp[i].fs>>tmp[i].sc;
		all.push_back(tmp[i].fs);
	}
	if(n&1){
		cout<<-1;
		return 0;
	}
	sort(all.begin(),all.end());
	for(int i = 0;i<n;i++){
		auto a = lower_bound(all.begin(),all.end(),tmp[i].fs)-all.begin()+1;
		auto b = lower_bound(all.begin(),all.end(),tmp[i].sc)-all.begin()+1;
		arr[a] = b;
		deg[b]++;
		jelly[b].push_back(a);
	}
	psyco.set();
	for(int i = 1;i<=n;i++){
		if(!deg[i])q.push(i);
	}
	while(!q.empty()){
		auto now = q.front();
		q.pop();
		psyco[now] = false;
		deg[arr[now]]--;
		if(!deg[arr[now]]){
			q.push(arr[now]);
		}
	}
	for(int i = 1;i<=n;i++){
		if(psyco[i])dfs(i);
	}
	vector<pii> v;
	ans = n;
	for(int i = 1;i<=n;i++){
		if(vis[i]||!psyco[i])continue;
		v.clear();
		int now = i;
		do{
			v.push_back({dp[now][0],dp[now][1]});
			vis[now] = true;
			now = arr[now];
		}while(now != i);
		calc(v);
	}
	cout<<ans;
}

Compilation message

polygon.cpp: In function 'void calc(std::vector<std::pair<int, int> >&)':
polygon.cpp:50:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |  for(int i = 1;i<v.size();i++){
      |                ~^~~~~~~~~
polygon.cpp:60:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |  for(int i = 1;i<v.size();i++){
      |                ~^~~~~~~~~

Subtask #1
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10328 KB Output is correct
2 Correct 2 ms 10588 KB Output is correct
3 Correct 3 ms 10492 KB Output is correct
4 Correct 2 ms 10332 KB Output is correct
5 Correct 3 ms 10332 KB Output is correct
6 Correct 2 ms 10332 KB Output is correct
7 Correct 2 ms 10332 KB Output is correct
8 Correct 3 ms 10332 KB Output is correct
9 Correct 3 ms 10328 KB Output is correct
10 Correct 3 ms 10332 KB Output is correct
11 Correct 2 ms 10332 KB Output is correct
12 Correct 3 ms 10332 KB Output is correct
13 Correct 3 ms 10332 KB Output is correct
14 Correct 2 ms 10496 KB Output is correct
15 Correct 2 ms 10332 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10332 KB Output is correct
2 Correct 3 ms 10332 KB Output is correct
3 Correct 3 ms 10328 KB Output is correct
4 Correct 93 ms 22212 KB Output is correct
5 Correct 87 ms 19908 KB Output is correct
6 Correct 87 ms 21568 KB Output is correct
7 Correct 15 ms 17360 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 99 ms 18368 KB Output is correct
2 Correct 91 ms 20412 KB Output is correct
3 Correct 77 ms 18876 KB Output is correct
4 Correct 16 ms 17364 KB Output is correct
5 Correct 107 ms 24920 KB Output is correct
6 Correct 90 ms 17804 KB Output is correct
7 Correct 88 ms 18112 KB Output is correct
8 Correct 90 ms 17908 KB Output is correct
9 Correct 83 ms 17344 KB Output is correct
10 Correct 66 ms 18384 KB Output is correct
11 Correct 2 ms 10332 KB Output is correct
12 Correct 2 ms 10428 KB Output is correct
13 Correct 2 ms 10332 KB Output is correct
14 Correct 2 ms 10332 KB Output is correct

Subtask #4
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10328 KB Output is correct
2 Correct 2 ms 10588 KB Output is correct
3 Correct 3 ms 10492 KB Output is correct
4 Correct 2 ms 10332 KB Output is correct
5 Correct 3 ms 10332 KB Output is correct
6 Correct 2 ms 10332 KB Output is correct
7 Correct 2 ms 10332 KB Output is correct
8 Correct 3 ms 10332 KB Output is correct
9 Correct 3 ms 10328 KB Output is correct
10 Correct 3 ms 10332 KB Output is correct
11 Correct 2 ms 10332 KB Output is correct
12 Correct 3 ms 10332 KB Output is correct
13 Correct 3 ms 10332 KB Output is correct
14 Correct 2 ms 10496 KB Output is correct
15 Correct 2 ms 10332 KB Output is correct
16 Correct 2 ms 10332 KB Output is correct
17 Correct 3 ms 10332 KB Output is correct
18 Correct 3 ms 10328 KB Output is correct
19 Correct 93 ms 22212 KB Output is correct
20 Correct 87 ms 19908 KB Output is correct
21 Correct 87 ms 21568 KB Output is correct
22 Correct 15 ms 17360 KB Output is correct
23 Correct 99 ms 18368 KB Output is correct
24 Correct 91 ms 20412 KB Output is correct
25 Correct 77 ms 18876 KB Output is correct
26 Correct 16 ms 17364 KB Output is correct
27 Correct 107 ms 24920 KB Output is correct
28 Correct 90 ms 17804 KB Output is correct
29 Correct 88 ms 18112 KB Output is correct
30 Correct 90 ms 17908 KB Output is correct
31 Correct 83 ms 17344 KB Output is correct
32 Correct 66 ms 18384 KB Output is correct
33 Correct 2 ms 10332 KB Output is correct
34 Correct 2 ms 10428 KB Output is correct
35 Correct 2 ms 10332 KB Output is correct
36 Correct 2 ms 10332 KB Output is correct
37 Correct 117 ms 18928 KB Output is correct
38 Correct 90 ms 19060 KB Output is correct
39 Correct 90 ms 18452 KB Output is correct
40 Correct 92 ms 18072 KB Output is correct
41 Correct 88 ms 18060 KB Output is correct
42 Correct 89 ms 18740 KB Output is correct
43 Correct 87 ms 18364 KB Output is correct
44 Correct 92 ms 18624 KB Output is correct
45 Correct 96 ms 18188 KB Output is correct
46 Correct 88 ms 17856 KB Output is correct
47 Correct 103 ms 17792 KB Output is correct
48 Correct 90 ms 18208 KB Output is correct
49 Correct 91 ms 19904 KB Output is correct
50 Correct 79 ms 18876 KB Output is correct
51 Correct 16 ms 16596 KB Output is correct
52 Correct 91 ms 24692 KB Output is correct
53 Correct 97 ms 17600 KB Output is correct
54 Correct 87 ms 17528 KB Output is correct
55 Correct 92 ms 18880 KB Output is correct
56 Correct 83 ms 17364 KB Output is correct
57 Correct 65 ms 17124 KB Output is correct
58 Correct 2 ms 10332 KB Output is correct
59 Correct 2 ms 10332 KB Output is correct
60 Correct 2 ms 10332 KB Output is correct
61 Correct 3 ms 10332 KB Output is correct
62 Correct 2 ms 10332 KB Output is correct
63 Correct 2 ms 10332 KB Output is correct
64 Correct 2 ms 10332 KB Output is correct
65 Correct 93 ms 21244 KB Output is correct
66 Correct 87 ms 18884 KB Output is correct
67 Correct 86 ms 22080 KB Output is correct
68 Correct 16 ms 16588 KB Output is correct
69 Correct 2 ms 10332 KB Output is correct
70 Correct 2 ms 10332 KB Output is correct
71 Correct 2 ms 10332 KB Output is correct
72 Correct 2 ms 10500 KB Output is correct
73 Correct 3 ms 10500 KB Output is correct
74 Correct 3 ms 10328 KB Output is correct
75 Correct 3 ms 10328 KB Output is correct
76 Correct 2 ms 10332 KB Output is correct
77 Correct 2 ms 10332 KB Output is correct
78 Correct 3 ms 10492 KB Output is correct
79 Correct 2 ms 10332 KB Output is correct
80 Correct 2 ms 10332 KB Output is correct
81 Correct 3 ms 10432 KB Output is correct
82 Correct 2 ms 10332 KB Output is correct
83 Correct 3 ms 10332 KB Output is correct