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Submission #440878

# Submission time Handle Problem Language Result Execution time Memory
440878 2021-07-03T12:20:35 Z Haruto810198 Love Polygon (BOI18_polygon) C++17
100 / 100
 235 ms 13120 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 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 324 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 0 ms 204 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 235 ms 9764 KB Output is correct
5 Correct 215 ms 9668 KB Output is correct
6 Correct 217 ms 9776 KB Output is correct
7 Correct 228 ms 9796 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 229 ms 10080 KB Output is correct
2 Correct 225 ms 10052 KB Output is correct
3 Correct 177 ms 9752 KB Output is correct
4 Correct 207 ms 9668 KB Output is correct
5 Correct 219 ms 9764 KB Output is correct
6 Correct 222 ms 10540 KB Output is correct
7 Correct 214 ms 10380 KB Output is correct
8 Correct 216 ms 10444 KB Output is correct
9 Correct 209 ms 10868 KB Output is correct
10 Correct 169 ms 10104 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 0 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 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 324 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 0 ms 204 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 0 ms 204 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 235 ms 9764 KB Output is correct
20 Correct 215 ms 9668 KB Output is correct
21 Correct 217 ms 9776 KB Output is correct
22 Correct 228 ms 9796 KB Output is correct
23 Correct 229 ms 10080 KB Output is correct
24 Correct 225 ms 10052 KB Output is correct
25 Correct 177 ms 9752 KB Output is correct
26 Correct 207 ms 9668 KB Output is correct
27 Correct 219 ms 9764 KB Output is correct
28 Correct 222 ms 10540 KB Output is correct
29 Correct 214 ms 10380 KB Output is correct
30 Correct 216 ms 10444 KB Output is correct
31 Correct 209 ms 10868 KB Output is correct
32 Correct 169 ms 10104 KB Output is correct
33 Correct 0 ms 204 KB Output is correct
34 Correct 0 ms 204 KB Output is correct
35 Correct 0 ms 204 KB Output is correct
36 Correct 0 ms 204 KB Output is correct
37 Correct 233 ms 12072 KB Output is correct
38 Correct 221 ms 12544 KB Output is correct
39 Correct 218 ms 12488 KB Output is correct
40 Correct 224 ms 12524 KB Output is correct
41 Correct 228 ms 12616 KB Output is correct
42 Correct 214 ms 12580 KB Output is correct
43 Correct 225 ms 12584 KB Output is correct
44 Correct 223 ms 12632 KB Output is correct
45 Correct 218 ms 12520 KB Output is correct
46 Correct 216 ms 12484 KB Output is correct
47 Correct 214 ms 13120 KB Output is correct
48 Correct 231 ms 12336 KB Output is correct
49 Correct 224 ms 12100 KB Output is correct
50 Correct 176 ms 11936 KB Output is correct
51 Correct 211 ms 11780 KB Output is correct
52 Correct 221 ms 11936 KB Output is correct
53 Correct 223 ms 12484 KB Output is correct
54 Correct 233 ms 12508 KB Output is correct
55 Correct 202 ms 12580 KB Output is correct
56 Correct 206 ms 13048 KB Output is correct
57 Correct 167 ms 12356 KB Output is correct
58 Correct 0 ms 332 KB Output is correct
59 Correct 1 ms 204 KB Output is correct
60 Correct 0 ms 204 KB Output is correct
61 Correct 1 ms 332 KB Output is correct
62 Correct 1 ms 332 KB Output is correct
63 Correct 0 ms 204 KB Output is correct
64 Correct 1 ms 204 KB Output is correct
65 Correct 229 ms 11928 KB Output is correct
66 Correct 234 ms 11864 KB Output is correct
67 Correct 223 ms 11936 KB Output is correct
68 Correct 226 ms 11736 KB Output is correct
69 Correct 1 ms 204 KB Output is correct
70 Correct 0 ms 332 KB Output is correct
71 Correct 0 ms 204 KB Output is correct
72 Correct 1 ms 204 KB Output is correct
73 Correct 1 ms 204 KB Output is correct
74 Correct 0 ms 204 KB Output is correct
75 Correct 0 ms 204 KB Output is correct
76 Correct 0 ms 332 KB Output is correct
77 Correct 0 ms 204 KB Output is correct
78 Correct 0 ms 204 KB Output is correct
79 Correct 1 ms 204 KB Output is correct
80 Correct 0 ms 204 KB Output is correct
81 Correct 1 ms 204 KB Output is correct
82 Correct 1 ms 332 KB Output is correct
83 Correct 1 ms 316 KB Output is correct