oj.uz

답안 #889244

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
889244 2023-12-19T08:39:02 Z Alora Logičari (COCI21_logicari) C++17
110 / 110
 169 ms 32104 KB 
#include <bits/stdc++.h>
#define Alora "cownav"
#define fi(i,a,b) for(int i = a; i <= b; i++)
#define fid(i,a,b) for(int i = a; i >= b; i--)
#define int long long
#define ll long long
#define f first
#define se second
#define pii pair<int, int>
#define getbit(i, j) ((i >> j) & 1)
#define all(v) v.begin(), v.end()
#define pb push_back
#define maxn 100005
const int M = 1e9 + 7;
using namespace std;
int n, anc[maxn], cha[maxn], root, special, res = 1e9;
vector <int> g[maxn];

int get(int u){
    if(anc[u] == 0) return u;
    return (anc[u] = get(anc[u]));
}

void dfs(int u, int fa){
    for(auto v: g[u]) if(v != fa){
        cha[v] = u;
        dfs(v, u);
    }
}
int dp[maxn][2][2][2][2];
int cal(int u, int me, int up, int rt, int sp){
    int &ans = dp[u][me][up][rt][sp];
    if(ans != -1) return ans;
    ans = 1e9;

    bool ok = 0;
    if(u == root && me != rt) ok = 1;
    if(u == special && me != sp) ok = 1;
    if(u == special && rt && up) ok = 1;
    if(ok) return (ans = 1e9); // TH vi phạm

    bool covered = 0;
    if(up || (u == root && sp) || (u == special && rt)) covered = 1;

    int sum = me;
    for(auto v: g[u]) if(v != cha[u]){
        sum += cal(v, 0, me, rt, sp);
    }

    if(covered) return (ans = sum); // TH đỉnh u đã đc bao phủ bởi 1 đỉnh màu đen
    for(auto v: g[u]) if(v != cha[u]){
        ans = min(ans, sum - cal(v, 0, me, rt, sp) + cal(v, 1, me, rt, sp));
    }
    return ans;
}
 main(){
	ios_base::sync_with_stdio(0);
	cin.tie(NULL);
	if(fopen(Alora".inp", "r")){
    freopen(Alora".inp", "r", stdin);
    freopen(Alora".out", "w", stdout);}
    cin >> n;
    fi(i, 1, n){
        int u, v; cin >> u >> v;
        int p = get(u), q = get(v);
        if(p != q){
            anc[p] = q;
            g[u].pb(v); g[v].pb(u);
        }
        else root = u, special = v;
        // xóa 1 cạnh trong chu trình để tạo thành cây -> dp trêm cây.
        // đánh dâu lại 2 đỉnh này, 1 đỉnh làm gốc, 1 đỉnh là special
    }

    memset(dp, -1, sizeof(dp));
    dfs(root, 0);
    fi(rt, 0, 1)
        fi(sp, 0, 1)
            res = min(res, cal(root, rt, 0, rt, sp));

    if(res == 1e9) cout << -1;
    else cout << res;

    return 0;
}

Compilation message

Main.cpp:56:2: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   56 |  main(){
      |  ^~~~
Main.cpp: In function 'int main()':
Main.cpp:60:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |     freopen(Alora".inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:61:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |     freopen(Alora".out", "w", stdout);}
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 15196 KB Output is correct
2 Correct 3 ms 15196 KB Output is correct
3 Correct 3 ms 15196 KB Output is correct
4 Correct 2 ms 15196 KB Output is correct
5 Correct 155 ms 30952 KB Output is correct
6 Correct 135 ms 30956 KB Output is correct
7 Correct 165 ms 30960 KB Output is correct
8 Correct 169 ms 30960 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 15196 KB Output is correct
2 Correct 2 ms 15196 KB Output is correct
3 Correct 3 ms 15196 KB Output is correct
4 Correct 3 ms 15196 KB Output is correct
5 Correct 3 ms 15196 KB Output is correct
6 Correct 2 ms 15196 KB Output is correct
7 Correct 3 ms 15196 KB Output is correct
8 Correct 3 ms 15196 KB Output is correct
9 Correct 3 ms 15328 KB Output is correct
10 Correct 3 ms 15196 KB Output is correct
11 Correct 3 ms 15196 KB Output is correct
12 Correct 3 ms 15196 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 15196 KB Output is correct
2 Correct 2 ms 15196 KB Output is correct
3 Correct 3 ms 15196 KB Output is correct
4 Correct 3 ms 15196 KB Output is correct
5 Correct 3 ms 15196 KB Output is correct
6 Correct 2 ms 15196 KB Output is correct
7 Correct 3 ms 15196 KB Output is correct
8 Correct 3 ms 15196 KB Output is correct
9 Correct 3 ms 15328 KB Output is correct
10 Correct 3 ms 15196 KB Output is correct
11 Correct 3 ms 15196 KB Output is correct
12 Correct 3 ms 15196 KB Output is correct
13 Correct 3 ms 15196 KB Output is correct
14 Correct 4 ms 15196 KB Output is correct
15 Correct 3 ms 15196 KB Output is correct
16 Correct 3 ms 15196 KB Output is correct
17 Correct 2 ms 15328 KB Output is correct
18 Correct 3 ms 15196 KB Output is correct
19 Correct 3 ms 15192 KB Output is correct
20 Correct 3 ms 15196 KB Output is correct
21 Correct 3 ms 15196 KB Output is correct
22 Correct 3 ms 15196 KB Output is correct
23 Correct 3 ms 15400 KB Output is correct
24 Correct 3 ms 15196 KB Output is correct

Subtask #4
50.0 / 50.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 15196 KB Output is correct
2 Correct 3 ms 15196 KB Output is correct
3 Correct 3 ms 15196 KB Output is correct
4 Correct 2 ms 15196 KB Output is correct
5 Correct 155 ms 30952 KB Output is correct
6 Correct 135 ms 30956 KB Output is correct
7 Correct 165 ms 30960 KB Output is correct
8 Correct 169 ms 30960 KB Output is correct
9 Correct 3 ms 15196 KB Output is correct
10 Correct 2 ms 15196 KB Output is correct
11 Correct 3 ms 15196 KB Output is correct
12 Correct 3 ms 15196 KB Output is correct
13 Correct 3 ms 15196 KB Output is correct
14 Correct 2 ms 15196 KB Output is correct
15 Correct 3 ms 15196 KB Output is correct
16 Correct 3 ms 15196 KB Output is correct
17 Correct 3 ms 15328 KB Output is correct
18 Correct 3 ms 15196 KB Output is correct
19 Correct 3 ms 15196 KB Output is correct
20 Correct 3 ms 15196 KB Output is correct
21 Correct 3 ms 15196 KB Output is correct
22 Correct 4 ms 15196 KB Output is correct
23 Correct 3 ms 15196 KB Output is correct
24 Correct 3 ms 15196 KB Output is correct
25 Correct 2 ms 15328 KB Output is correct
26 Correct 3 ms 15196 KB Output is correct
27 Correct 3 ms 15192 KB Output is correct
28 Correct 3 ms 15196 KB Output is correct
29 Correct 3 ms 15196 KB Output is correct
30 Correct 3 ms 15196 KB Output is correct
31 Correct 3 ms 15400 KB Output is correct
32 Correct 3 ms 15196 KB Output is correct
33 Correct 92 ms 20828 KB Output is correct
34 Correct 79 ms 20988 KB Output is correct
35 Correct 99 ms 20828 KB Output is correct
36 Correct 104 ms 20968 KB Output is correct
37 Correct 21 ms 16728 KB Output is correct
38 Correct 103 ms 20892 KB Output is correct
39 Correct 8 ms 15708 KB Output is correct
40 Correct 92 ms 20964 KB Output is correct
41 Correct 66 ms 22076 KB Output is correct
42 Correct 82 ms 21780 KB Output is correct
43 Correct 138 ms 32104 KB Output is correct
44 Correct 113 ms 26836 KB Output is correct