oj.uz

Submission #916637

# Submission time Handle Problem Language Result Execution time Memory
916637 2024-01-26T08:09:46 Z LCJLY Love Polygon (BOI18_polygon) C++14
100 / 100
 213 ms 11952 KB 
#include <bits/stdc++.h>
using namespace std;
 
#define int long long
#define ld long double
#define show(x,y) cout << y << " " << #x << endl;
#define show2(x,y,i,j) cout << y << " " << #x << "  " << j << " " << #i << endl;
#define show3(x,y,i,j,p,q) cout << y << " " << #x << "  " << j << " " << #i << "  " << q << " " << #p << endl; 
#define show4(x,y) for(auto it:x) cout << it << " "; cout << #y << endl;
typedef pair<int,int>pii;

int pp[100005];
map<string,int>mp;
int ptr=0;
int sz=0;
bool visited[100005];
int in[100005];

void dfs(int index){
	sz++;
	visited[index]=true;
	int nx=pp[index];
	if(visited[nx]) return;
	dfs(nx);
}


void solve(){
	int n;
	cin >> n;
	string s,s2;
	for(int x=0;x<n;x++){
		cin >> s >> s2;
		if(mp.find(s)==mp.end()){
			mp[s]=ptr++;
		}
		if(mp.find(s2)==mp.end()){
			mp[s2]=ptr++;
		}
		pp[mp[s]]=mp[s2];
		//show2(a,mp[s],b,mp[s2]);
		in[mp[s2]]++;
	}
	
	for(int x=0;x<n;x++){
		if(pp[pp[x]]==x&&pp[x]!=x){
			//relationship
			visited[x]=true;
			visited[pp[x]]=true;
		}
	}
	
	int counter=0;
	queue<int>q;
	for(int x=0;x<n;x++){
		if(in[x]==0) q.push(x);
	}
	while(!q.empty()){
		int cur=q.front();
		q.pop();
		if(visited[cur]) continue;
		int nx=pp[cur];
		//show2(cur,cur,nx,nx);
		if(visited[nx]){
			pp[cur]=cur;
			continue;
		}
		counter++;
		in[pp[nx]]--;
		if(in[pp[nx]]==0)q.push(pp[nx]);
		pp[nx]=cur;
		visited[nx]=true;
		visited[cur]=true;
	}
	
	for(int x=0;x<n;x++){
		if(visited[x]) continue;
		//show(visit,x);
		sz=0;
		dfs(x);
		if(sz==2) continue;
		counter+=(sz+1)/2;
	}
	if(n%2) cout << -1;
	else cout << counter;
}

int32_t main(){										
	ios::sync_with_stdio(0);	
	cin.tie(0);
	int t=1;
	//cin >> t;
	while(t--){
		solve();
	}
}

Subtask #1
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 0 ms 464 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 159 ms 11228 KB Output is correct
5 Correct 163 ms 11244 KB Output is correct
6 Correct 170 ms 11344 KB Output is correct
7 Correct 150 ms 11404 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 163 ms 11600 KB Output is correct
2 Correct 174 ms 11284 KB Output is correct
3 Correct 140 ms 11120 KB Output is correct
4 Correct 156 ms 11448 KB Output is correct
5 Correct 163 ms 11088 KB Output is correct
6 Correct 147 ms 11600 KB Output is correct
7 Correct 184 ms 11460 KB Output is correct
8 Correct 151 ms 11456 KB Output is correct
9 Correct 157 ms 11660 KB Output is correct
10 Correct 117 ms 11092 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct

Subtask #4
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 0 ms 464 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 159 ms 11228 KB Output is correct
20 Correct 163 ms 11244 KB Output is correct
21 Correct 170 ms 11344 KB Output is correct
22 Correct 150 ms 11404 KB Output is correct
23 Correct 163 ms 11600 KB Output is correct
24 Correct 174 ms 11284 KB Output is correct
25 Correct 140 ms 11120 KB Output is correct
26 Correct 156 ms 11448 KB Output is correct
27 Correct 163 ms 11088 KB Output is correct
28 Correct 147 ms 11600 KB Output is correct
29 Correct 184 ms 11460 KB Output is correct
30 Correct 151 ms 11456 KB Output is correct
31 Correct 157 ms 11660 KB Output is correct
32 Correct 117 ms 11092 KB Output is correct
33 Correct 1 ms 344 KB Output is correct
34 Correct 1 ms 348 KB Output is correct
35 Correct 0 ms 348 KB Output is correct
36 Correct 0 ms 348 KB Output is correct
37 Correct 176 ms 11260 KB Output is correct
38 Correct 173 ms 11344 KB Output is correct
39 Correct 160 ms 11780 KB Output is correct
40 Correct 154 ms 11396 KB Output is correct
41 Correct 206 ms 11596 KB Output is correct
42 Correct 157 ms 11348 KB Output is correct
43 Correct 163 ms 11340 KB Output is correct
44 Correct 189 ms 11536 KB Output is correct
45 Correct 150 ms 11516 KB Output is correct
46 Correct 213 ms 11296 KB Output is correct
47 Correct 152 ms 11952 KB Output is correct
48 Correct 163 ms 11396 KB Output is correct
49 Correct 163 ms 11088 KB Output is correct
50 Correct 140 ms 11176 KB Output is correct
51 Correct 150 ms 11600 KB Output is correct
52 Correct 160 ms 11092 KB Output is correct
53 Correct 165 ms 11380 KB Output is correct
54 Correct 147 ms 11592 KB Output is correct
55 Correct 161 ms 11276 KB Output is correct
56 Correct 139 ms 11740 KB Output is correct
57 Correct 118 ms 11272 KB Output is correct
58 Correct 0 ms 344 KB Output is correct
59 Correct 1 ms 348 KB Output is correct
60 Correct 0 ms 348 KB Output is correct
61 Correct 1 ms 344 KB Output is correct
62 Correct 1 ms 348 KB Output is correct
63 Correct 0 ms 348 KB Output is correct
64 Correct 1 ms 348 KB Output is correct
65 Correct 174 ms 11156 KB Output is correct
66 Correct 170 ms 11088 KB Output is correct
67 Correct 149 ms 10072 KB Output is correct
68 Correct 147 ms 9812 KB Output is correct
69 Correct 1 ms 348 KB Output is correct
70 Correct 1 ms 348 KB Output is correct
71 Correct 0 ms 348 KB Output is correct
72 Correct 0 ms 344 KB Output is correct
73 Correct 0 ms 344 KB Output is correct
74 Correct 0 ms 348 KB Output is correct
75 Correct 0 ms 348 KB Output is correct
76 Correct 0 ms 348 KB Output is correct
77 Correct 0 ms 348 KB Output is correct
78 Correct 0 ms 348 KB Output is correct
79 Correct 0 ms 348 KB Output is correct
80 Correct 0 ms 412 KB Output is correct
81 Correct 0 ms 348 KB Output is correct
82 Correct 0 ms 348 KB Output is correct
83 Correct 0 ms 348 KB Output is correct