oj.uz

답안 #645407

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
645407 2022-09-27T05:53:32 Z mychecksedad Love Polygon (BOI18_polygon) C++17
46 / 100
 294 ms 41420 KB 
/* Author : Mychecksdead */
#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef long double ld;
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define PI 3.1415926535
#define pb push_back
#define setp() cout << setprecision(15)
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " is " << x << '\n';
const int N = 1e6+100, M = 1e5+10, F = 2147483646, K = 20;

int n, to[N], res = 0, dp[N][2];
string x, y;
vector<int> in(N), g[N];
map<string, int> s;
vector<bool> vis(N), is(N);

void dfs(int v, int d){
    vis[v] = 1;
    int u = to[v];
    if(vis[u]){
        if(d > 2) res += (d+1)/2;
        else if(d == 1) res++;
    }else dfs(u, d + 1);
}
void dfs1(int v){
    dp[v][0] = dp[v][1] = MOD;
    if(g[v].size() == 0){
        dp[v][0] = dp[v][1] = 1;
    }
    dp[v][0] = 1;
    int sum = 0;
    for(int u: g[v]){   
        dfs1(u);
        dp[v][0] += min(dp[u][0], dp[u][1]);
        sum += dp[u][1];
    }
    for(int u: g[v]){
        dp[v][1] = min(dp[v][1], sum - dp[u][1] + dp[u][0]);
    }
}

void solve(){
    cin >> n;
    int c = 1;
    for(int i = 0; i < n; ++i){
        cin >> x >> y;
        if(s[x] == 0) s[x] = c++;
        if(s[y] == 0) s[y] = c++;
        int a = s[x] - 1, b = s[y] - 1;
        to[a] = b;
        is[b] = 1; 
        g[b].pb(a);
    }
    if(n&1){
        cout << -1;
        return;
    }
    if(n <= 20){
        int ans = n;
        for(int mask = 0; mask < (1<<n); ++mask){

            bool ok = 1;
            vector<int> v;

            for(int j = 0; j < n; ++j){
                if(!((1<<j)&mask)){
                    v.pb(to[j]);
                    if(to[j] == j) ok = 0;
                    else if(!(to[to[j]] == j || ((1<<to[j])&mask))) ok = 0;
                }
            }
            sort(all(v));
            
            for(int j = 0; j < int(v.size()) - 1; ++j) if(v[j] == v[j + 1]) ok = 0;
            

            if(ok){
                if(ans > __builtin_popcount(mask)){
                    ans = __builtin_popcount(mask);
                }
            }
        }
        cout << ans;
        return;
    }
    bool ok = 1;
    for(int i = 0; i < n; ++i) ok &= is[i];
    // if(ok)
        for(int i = 0; i < n; ++i) if(!vis[i]) dfs(i, 1);
    // else
        // for(int i = 0; i < n; ++i) if(to[i] == i) dfs1(i), res += min(dp[i][0], dp[i][1]);
    cout << res;
}





int main(){
    cin.tie(0); ios::sync_with_stdio(0);
    int T = 1, aa;
    // cin >> T;aa=T;
    while(T--){
        // cout << "Case #" << aa-T << ": ";
        solve();
        cout << '\n';
    }
    return 0;
 
}

Compilation message

polygon.cpp: In function 'int main()':
polygon.cpp:105:16: warning: unused variable 'aa' [-Wunused-variable]
  105 |     int T = 1, aa;
      |                ^~

Subtask #1
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 255 ms 27988 KB Output is correct
2 Correct 226 ms 27988 KB Output is correct
3 Correct 276 ms 27988 KB Output is correct
4 Correct 14 ms 27988 KB Output is correct
5 Correct 16 ms 27880 KB Output is correct
6 Correct 14 ms 27988 KB Output is correct
7 Correct 269 ms 27900 KB Output is correct
8 Correct 288 ms 27988 KB Output is correct
9 Correct 281 ms 27988 KB Output is correct
10 Correct 274 ms 27988 KB Output is correct
11 Correct 294 ms 27988 KB Output is correct
12 Correct 14 ms 27896 KB Output is correct
13 Correct 16 ms 27964 KB Output is correct
14 Correct 15 ms 27988 KB Output is correct
15 Correct 14 ms 27880 KB Output is correct

Subtask #2
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 27860 KB Output is correct
2 Correct 14 ms 27980 KB Output is correct
3 Correct 14 ms 27988 KB Output is correct
4 Correct 217 ms 39312 KB Output is correct
5 Correct 267 ms 41392 KB Output is correct
6 Correct 203 ms 41352 KB Output is correct
7 Correct 216 ms 41420 KB Output is correct

Subtask #3
0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 195 ms 38520 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 255 ms 27988 KB Output is correct
2 Correct 226 ms 27988 KB Output is correct
3 Correct 276 ms 27988 KB Output is correct
4 Correct 14 ms 27988 KB Output is correct
5 Correct 16 ms 27880 KB Output is correct
6 Correct 14 ms 27988 KB Output is correct
7 Correct 269 ms 27900 KB Output is correct
8 Correct 288 ms 27988 KB Output is correct
9 Correct 281 ms 27988 KB Output is correct
10 Correct 274 ms 27988 KB Output is correct
11 Correct 294 ms 27988 KB Output is correct
12 Correct 14 ms 27896 KB Output is correct
13 Correct 16 ms 27964 KB Output is correct
14 Correct 15 ms 27988 KB Output is correct
15 Correct 14 ms 27880 KB Output is correct
16 Correct 13 ms 27860 KB Output is correct
17 Correct 14 ms 27980 KB Output is correct
18 Correct 14 ms 27988 KB Output is correct
19 Correct 217 ms 39312 KB Output is correct
20 Correct 267 ms 41392 KB Output is correct
21 Correct 203 ms 41352 KB Output is correct
22 Correct 216 ms 41420 KB Output is correct
23 Incorrect 195 ms 38520 KB Output isn't correct
24 Halted 0 ms 0 KB -