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Submission #441631

# Submission time Handle Problem Language Result Execution time Memory
441631 2021-07-05T15:27:37 Z Haruto810198 Love Polygon (BOI18_polygon) C++17
100 / 100
 217 ms 12460 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
#define int long long
#define double long double
 
#define FOR(i, l, r, d) for(int i=(l); i<=(r); i+=(d))
#define szof(x) ((int)(x).size())
 
#define vi vector<int>
#define pii pair<int,int>
 
#define pb push_back
#define eb emplace_back
#define mkp make_pair
 
const int INF = 2147483647;
const int LNF = INF*INF;
const int MOD = 1000000007;
const int mod = 998244353;
 
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")
 
const int MAX = 100010;
 
int n;
map<string, int> mp;
int edge[MAX];
int indeg[MAX];
bool exist[MAX];
 
vi qu;
int res;
 
int query(string str){
    if(mp.find(str) == mp.end()){
        mp[str] = szof(mp) + 1;
    }
    return mp[str];
}
 
signed main(){
 
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
 
    cin>>n;
    FOR(i, 1, n, 1){
        string su, sv;
        cin>>su>>sv;
        int u = query(su);
        int v = query(sv);
        edge[u] = v;
        indeg[v]++;
    }
 
    if(n%2 == 1){
        cout<<-1<<'\n';
        return 0;
    }
 
    FOR(i, 1, n, 1){
        exist[i] = 1;
        if(indeg[i] == 0){
            qu.pb(i);
        }
    }
 
    res = n;
 
    FOR(i, 1, n, 1){
 
        if(exist[i]==0) continue;
 
        if(edge[edge[i]] == i and edge[i] != i){
            res -= 2;
            exist[i] = 0;
            exist[edge[i]] = 0;
            indeg[i]--;
            indeg[edge[i]]--;
        }
 
    }
 
    while(!qu.empty()){
 
        int u = qu.back();
        qu.pop_back();
        if(exist[u]==0) continue;
 
        int v = edge[u];
        if(exist[v]==0) continue;
        int w = edge[v];
 
        exist[u] = 0;
        exist[v] = 0;
        indeg[v]--;
        indeg[w]--;
        res--;
 
        if(indeg[w] == 0 and exist[w] == 1) qu.pb(w);
 
    }
 
    FOR(i, 1, n, 1){
 
        if(exist[i]==0) continue;
 
        int ptr = i;
        int cnt = 0;
        while(exist[ptr] == 1){
            exist[ptr] = 0;
            ptr = edge[ptr];
            cnt++;
        }
 
        if(ptr == i){
            if(cnt == 2){
                res -= 2;
            }
            else{
                res -= cnt / 2;
            }
        }
 
    }
 
    cout<<res<<'\n';
 
    /*
    FOR(i, 1, n, 1){
        cerr<<exist[i]<<" ";
    }
    cerr<<endl;
    */
 
    return 0;
 
}

Subtask #1
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 320 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 212 ms 11192 KB Output is correct
5 Correct 212 ms 11200 KB Output is correct
6 Correct 207 ms 11216 KB Output is correct
7 Correct 214 ms 11304 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 209 ms 11640 KB Output is correct
2 Correct 214 ms 11456 KB Output is correct
3 Correct 176 ms 11332 KB Output is correct
4 Correct 199 ms 11204 KB Output is correct
5 Correct 208 ms 11320 KB Output is correct
6 Correct 211 ms 11840 KB Output is correct
7 Correct 202 ms 11920 KB Output is correct
8 Correct 201 ms 11952 KB Output is correct
9 Correct 200 ms 12392 KB Output is correct
10 Correct 160 ms 11564 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 0 ms 256 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct

Subtask #4
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 320 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 0 ms 332 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 212 ms 11192 KB Output is correct
20 Correct 212 ms 11200 KB Output is correct
21 Correct 207 ms 11216 KB Output is correct
22 Correct 214 ms 11304 KB Output is correct
23 Correct 209 ms 11640 KB Output is correct
24 Correct 214 ms 11456 KB Output is correct
25 Correct 176 ms 11332 KB Output is correct
26 Correct 199 ms 11204 KB Output is correct
27 Correct 208 ms 11320 KB Output is correct
28 Correct 211 ms 11840 KB Output is correct
29 Correct 202 ms 11920 KB Output is correct
30 Correct 201 ms 11952 KB Output is correct
31 Correct 200 ms 12392 KB Output is correct
32 Correct 160 ms 11564 KB Output is correct
33 Correct 0 ms 204 KB Output is correct
34 Correct 0 ms 256 KB Output is correct
35 Correct 0 ms 204 KB Output is correct
36 Correct 1 ms 204 KB Output is correct
37 Correct 209 ms 11444 KB Output is correct
38 Correct 215 ms 11992 KB Output is correct
39 Correct 199 ms 11944 KB Output is correct
40 Correct 212 ms 11888 KB Output is correct
41 Correct 209 ms 11844 KB Output is correct
42 Correct 203 ms 11980 KB Output is correct
43 Correct 215 ms 11976 KB Output is correct
44 Correct 208 ms 11952 KB Output is correct
45 Correct 203 ms 11940 KB Output is correct
46 Correct 202 ms 11932 KB Output is correct
47 Correct 194 ms 12460 KB Output is correct
48 Correct 212 ms 11708 KB Output is correct
49 Correct 205 ms 11460 KB Output is correct
50 Correct 176 ms 11336 KB Output is correct
51 Correct 217 ms 11168 KB Output is correct
52 Correct 206 ms 11232 KB Output is correct
53 Correct 205 ms 11900 KB Output is correct
54 Correct 210 ms 11904 KB Output is correct
55 Correct 195 ms 11976 KB Output is correct
56 Correct 189 ms 12392 KB Output is correct
57 Correct 157 ms 11588 KB Output is correct
58 Correct 0 ms 324 KB Output is correct
59 Correct 1 ms 204 KB Output is correct
60 Correct 1 ms 332 KB Output is correct
61 Correct 1 ms 320 KB Output is correct
62 Correct 1 ms 204 KB Output is correct
63 Correct 1 ms 332 KB Output is correct
64 Correct 0 ms 204 KB Output is correct
65 Correct 202 ms 11248 KB Output is correct
66 Correct 202 ms 11236 KB Output is correct
67 Correct 213 ms 11284 KB Output is correct
68 Correct 203 ms 11224 KB Output is correct
69 Correct 1 ms 204 KB Output is correct
70 Correct 1 ms 332 KB Output is correct
71 Correct 1 ms 204 KB Output is correct
72 Correct 1 ms 332 KB Output is correct
73 Correct 1 ms 204 KB Output is correct
74 Correct 1 ms 204 KB Output is correct
75 Correct 1 ms 204 KB Output is correct
76 Correct 1 ms 204 KB Output is correct
77 Correct 1 ms 204 KB Output is correct
78 Correct 1 ms 204 KB Output is correct
79 Correct 1 ms 204 KB Output is correct
80 Correct 1 ms 204 KB Output is correct
81 Correct 1 ms 316 KB Output is correct
82 Correct 1 ms 204 KB Output is correct
83 Correct 1 ms 204 KB Output is correct