oj.uz

Submission #746361

# Submission time Handle Problem Language Result Execution time Memory
746361 2023-05-22T11:50:55 Z gagik_2007 Love Polygon (BOI18_polygon) C++17
75 / 100
 264 ms 30976 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;

typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define ff first
#define ss second

ll ttt;
const ll INF = 1e18;
const ll MOD = 1e9 + 7;
const int N = 100007;
ll n, m, k;
string name[N];
map<string, int> revname;
vector<int>g[N];
// topological order 
vector<int>order;
bool vis[N];
bool used[N];

void dfs(int u){
    vis[u]=true;
    for(auto v:g[u]){
        if(!vis[v]){
            dfs(v);
        }
    }
    order.push_back(u);
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin>>n;
    vector<pair<string,string>>vec;
    for(int i=0;i<n;i++){
        string a,b;
        cin>>a>>b;
        vec.push_back({a,b});
        name[i]=a;
        revname[a]=i;
    }
    if(n%2==1){
        cout<<-1<<endl;
        return 0;
    }
    for(auto e:vec){
        string a=e.ff;
        string b=e.ss;
        int u=revname[a];
        int v=revname[b];
        g[u].push_back(v);
    }
    for(int i=0;i<n;i++){
        if(!vis[i]){
            dfs(i);
        }
    }
    reverse(order.begin(),order.end());
    for(int v=0;v<n;v++){
        if(g[g[v][0]][0]==v&&g[v][0]!=v){
            used[v]=true;
        }
    }
    int tuzik=0;
    int ans=0;
    for(int v:order){
        if(!used[v]){
            int to=g[v][0];
            if(used[to]){
                tuzik++;
            }
            else{
                ans++;
                used[to]=true;
            }
            used[v]=true;
        }
    }
    cout<<ans+tuzik<<endl;
    return 0;
}

Subtask #1
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5716 KB Output is correct
2 Correct 4 ms 5804 KB Output is correct
3 Correct 4 ms 5804 KB Output is correct
4 Correct 3 ms 5716 KB Output is correct
5 Correct 3 ms 5800 KB Output is correct
6 Correct 3 ms 5804 KB Output is correct
7 Correct 3 ms 5716 KB Output is correct
8 Correct 4 ms 5800 KB Output is correct
9 Correct 3 ms 5772 KB Output is correct
10 Correct 5 ms 5700 KB Output is correct
11 Correct 3 ms 5808 KB Output is correct
12 Correct 4 ms 5716 KB Output is correct
13 Correct 3 ms 5716 KB Output is correct
14 Correct 3 ms 5800 KB Output is correct
15 Correct 3 ms 5716 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5716 KB Output is correct
2 Correct 4 ms 5716 KB Output is correct
3 Correct 3 ms 5716 KB Output is correct
4 Correct 215 ms 30232 KB Output is correct
5 Correct 203 ms 26256 KB Output is correct
6 Correct 217 ms 30976 KB Output is correct
7 Correct 88 ms 21960 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 223 ms 26172 KB Output is correct
2 Correct 197 ms 27008 KB Output is correct
3 Correct 174 ms 26280 KB Output is correct
4 Correct 105 ms 21988 KB Output is correct
5 Correct 260 ms 28048 KB Output is correct
6 Correct 230 ms 26252 KB Output is correct
7 Correct 208 ms 26408 KB Output is correct
8 Correct 197 ms 26176 KB Output is correct
9 Correct 211 ms 26208 KB Output is correct
10 Correct 181 ms 26276 KB Output is correct
11 Correct 5 ms 5716 KB Output is correct
12 Correct 4 ms 5716 KB Output is correct
13 Correct 4 ms 5716 KB Output is correct
14 Correct 4 ms 5808 KB Output is correct

Subtask #4
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5716 KB Output is correct
2 Correct 4 ms 5804 KB Output is correct
3 Correct 4 ms 5804 KB Output is correct
4 Correct 3 ms 5716 KB Output is correct
5 Correct 3 ms 5800 KB Output is correct
6 Correct 3 ms 5804 KB Output is correct
7 Correct 3 ms 5716 KB Output is correct
8 Correct 4 ms 5800 KB Output is correct
9 Correct 3 ms 5772 KB Output is correct
10 Correct 5 ms 5700 KB Output is correct
11 Correct 3 ms 5808 KB Output is correct
12 Correct 4 ms 5716 KB Output is correct
13 Correct 3 ms 5716 KB Output is correct
14 Correct 3 ms 5800 KB Output is correct
15 Correct 3 ms 5716 KB Output is correct
16 Correct 3 ms 5716 KB Output is correct
17 Correct 4 ms 5716 KB Output is correct
18 Correct 3 ms 5716 KB Output is correct
19 Correct 215 ms 30232 KB Output is correct
20 Correct 203 ms 26256 KB Output is correct
21 Correct 217 ms 30976 KB Output is correct
22 Correct 88 ms 21960 KB Output is correct
23 Correct 223 ms 26172 KB Output is correct
24 Correct 197 ms 27008 KB Output is correct
25 Correct 174 ms 26280 KB Output is correct
26 Correct 105 ms 21988 KB Output is correct
27 Correct 260 ms 28048 KB Output is correct
28 Correct 230 ms 26252 KB Output is correct
29 Correct 208 ms 26408 KB Output is correct
30 Correct 197 ms 26176 KB Output is correct
31 Correct 211 ms 26208 KB Output is correct
32 Correct 181 ms 26276 KB Output is correct
33 Correct 5 ms 5716 KB Output is correct
34 Correct 4 ms 5716 KB Output is correct
35 Correct 4 ms 5716 KB Output is correct
36 Correct 4 ms 5808 KB Output is correct
37 Correct 264 ms 26288 KB Output is correct
38 Incorrect 218 ms 26972 KB Output isn't correct
39 Halted 0 ms 0 KB -