oj.uz

Submission #547972

# Submission time Handle Problem Language Result Execution time Memory
547972 2022-04-12T05:22:24 Z Jarif_Rahman Love Polygon (BOI18_polygon) C++17
100 / 100
 199 ms 30036 KB 
#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;

int n;
vector<vector<int>> v;
vector<int> succ;
vector<bool> bl;

pair<int, int> cycle;
bool cycle_type;

void dfs_cycle(int nd, int ss){
    if(bl[nd]){
        cycle = {ss, nd};
        return;
    }
    bl[nd] = 1;
    unordered_map<int, int> mp;
    for(int x: v[nd]) if(x != ss) dfs_cycle(x, nd), mp[x]++;
    for(auto [x, c]: mp) if(c > 1){
        cycle = {nd, x};
        if(nd != x) cycle_type = 1;
    }
}

int mc = 0;

bool dfs(int nd, int ss, bool type){
    bool s = 0;
    for(int x: v[nd])
        if(x != ss && (nd != cycle.f || x != cycle.sc) && (nd != cycle.sc || x != cycle.f))
            s|=dfs(x, nd, type);
    if(ss == -1 && cycle_type) dfs(cycle.sc, nd, type);
    if(type){
        if(nd == cycle.f) return 0;
        if(nd == cycle.sc){
            mc++;
            return 0;
        }
    }
    if(s) mc++;
    return !s;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n;
    if(n%2 != 0){
        cout << "-1\n";
        exit(0);
    }

    v.assign(n, {});
    succ.assign(n, -1);
    bl.assign(n, 0);
    unordered_map<str, int> mp;
    int in = 0;

    for(int i = 0; i < n; i++){
        str a, b; cin >> a >> b;
        if(mp.find(a) == mp.end()) mp[a] = in, in++;
        if(mp.find(b) == mp.end()) mp[b] = in, in++;  
        succ[mp[a]] = mp[b];
        v[mp[a]].pb(mp[b]);
        v[mp[b]].pb(mp[a]);
    }

    int ans = 0;

    for(int i = 0; i < n; i++){
        if(bl[i]) continue;
        int mx = 0;
        cycle_type = 0;
        dfs_cycle(i, -1);
        mc = 0;
        dfs(cycle.f, -1, 0);
        mx = max(mx, mc);
        if(cycle.f != cycle.sc){
            mc = 0;
            dfs(cycle.f, -1, 1);
            mx = max(mx, mc+cycle_type);
        }
        ans+=mx;
    }

    ans = n-ans;

    cout << ans << "\n";
}

Subtask #1
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 324 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 320 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 182 ms 28088 KB Output is correct
5 Correct 167 ms 15936 KB Output is correct
6 Correct 175 ms 29996 KB Output is correct
7 Correct 1 ms 328 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 149 ms 15868 KB Output is correct
2 Correct 181 ms 18512 KB Output is correct
3 Correct 97 ms 15936 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 176 ms 24088 KB Output is correct
6 Correct 186 ms 16028 KB Output is correct
7 Correct 163 ms 16084 KB Output is correct
8 Correct 117 ms 15936 KB Output is correct
9 Correct 115 ms 16532 KB Output is correct
10 Correct 83 ms 21048 KB Output is correct
11 Correct 1 ms 320 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct

Subtask #4
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 324 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 320 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 182 ms 28088 KB Output is correct
20 Correct 167 ms 15936 KB Output is correct
21 Correct 175 ms 29996 KB Output is correct
22 Correct 1 ms 328 KB Output is correct
23 Correct 149 ms 15868 KB Output is correct
24 Correct 181 ms 18512 KB Output is correct
25 Correct 97 ms 15936 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 176 ms 24088 KB Output is correct
28 Correct 186 ms 16028 KB Output is correct
29 Correct 163 ms 16084 KB Output is correct
30 Correct 117 ms 15936 KB Output is correct
31 Correct 115 ms 16532 KB Output is correct
32 Correct 83 ms 21048 KB Output is correct
33 Correct 1 ms 320 KB Output is correct
34 Correct 1 ms 212 KB Output is correct
35 Correct 1 ms 212 KB Output is correct
36 Correct 1 ms 212 KB Output is correct
37 Correct 172 ms 16128 KB Output is correct
38 Correct 161 ms 19452 KB Output is correct
39 Correct 138 ms 16004 KB Output is correct
40 Correct 167 ms 16032 KB Output is correct
41 Correct 167 ms 16000 KB Output is correct
42 Correct 141 ms 16036 KB Output is correct
43 Correct 137 ms 16104 KB Output is correct
44 Correct 153 ms 16136 KB Output is correct
45 Correct 199 ms 16132 KB Output is correct
46 Correct 153 ms 16212 KB Output is correct
47 Correct 134 ms 17080 KB Output is correct
48 Correct 173 ms 16020 KB Output is correct
49 Correct 137 ms 18636 KB Output is correct
50 Correct 81 ms 15952 KB Output is correct
51 Correct 1 ms 340 KB Output is correct
52 Correct 184 ms 24028 KB Output is correct
53 Correct 150 ms 15980 KB Output is correct
54 Correct 136 ms 15964 KB Output is correct
55 Correct 133 ms 15956 KB Output is correct
56 Correct 142 ms 16564 KB Output is correct
57 Correct 79 ms 21048 KB Output is correct
58 Correct 1 ms 212 KB Output is correct
59 Correct 1 ms 212 KB Output is correct
60 Correct 1 ms 212 KB Output is correct
61 Correct 1 ms 212 KB Output is correct
62 Correct 1 ms 212 KB Output is correct
63 Correct 1 ms 212 KB Output is correct
64 Correct 1 ms 324 KB Output is correct
65 Correct 196 ms 28200 KB Output is correct
66 Correct 125 ms 15876 KB Output is correct
67 Correct 164 ms 30036 KB Output is correct
68 Correct 1 ms 340 KB Output is correct
69 Correct 1 ms 212 KB Output is correct
70 Correct 1 ms 212 KB Output is correct
71 Correct 1 ms 212 KB Output is correct
72 Correct 1 ms 324 KB Output is correct
73 Correct 1 ms 212 KB Output is correct
74 Correct 1 ms 212 KB Output is correct
75 Correct 1 ms 212 KB Output is correct
76 Correct 1 ms 212 KB Output is correct
77 Correct 1 ms 212 KB Output is correct
78 Correct 0 ms 212 KB Output is correct
79 Correct 1 ms 212 KB Output is correct
80 Correct 1 ms 212 KB Output is correct
81 Correct 1 ms 212 KB Output is correct
82 Correct 1 ms 212 KB Output is correct
83 Correct 1 ms 212 KB Output is correct