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답안 #370771

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
370771 2021-02-24T15:04:16 Z Leonardo_Paes 철인 이종 경기 (APIO18_duathlon) C++17
31 / 100
 216 ms 26796 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ar array
#define sz(a) ((int)(a).size())
#define all(a) (a).begin(),(a).end()
typedef pair<int,int> pii;
#define f first
#define s second
const int maxn = 1e5+10;
vector<int> grafo[maxn], aux[maxn];
int n, m, dp[maxn], sz[maxn], qtd[maxn], qtd2[maxn], color[maxn], c;
bool instack[maxn], mark[maxn];
stack<int> s;
void compress(int u, int p = 0){
    instack[u] = mark[u] = 1;
    s.push(u);
    //cout << "entrei em " << u << endl;
    for(int v : grafo[u]){
        if(instack[v] and v != p){
            c++;
            int vv;
            do{
                vv = s.top();
                //cout << vv << endl;
                color[vv] = c;
                instack[vv] = 0;
                s.pop();
            }while(vv != v);
        }
        if(!mark[v]) compress(v, u);
    }
    if(instack[u]) s.pop();
    instack[u] = 0;
}
int solve(int u, int p = 0){ // lca of path is u, 1 as a root
    int ans = qtd[u]*(qtd[u]-1)*(qtd[u]-2); // sum of dps
    sz[u] = qtd[u];
    for(int v : grafo[u]){
        if(v == p) continue;
        ans += solve(v, u);
        sz[u] += sz[v];
        qtd2[u] += qtd2[v] + sz[v] * qtd[u];
    }
    for(int v : grafo[u]){
        if(v == p) continue;
        dp[u] += sz[v] * (sz[u] - qtd[u] - sz[v]) * qtd[u]; // 1 from each
        dp[u] += 2 * sz[v] * (qtd[u] - 1 + (qtd[u] - 1) * (qtd[u] - 2));
        dp[u] += 2 * (sz[u] - sz[v]) * qtd2[v];
    }
    if(grafo[u].size() == 1){
        qtd2[u] = sz[u] - 1 + (sz[u] - 1) * (sz[u] - 2);
    }
    return ans + dp[u];
}
int32_t main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    cin >> n >> m;
    for(int i=1; i<=m; i++){
        int u, v;
        cin >> u >> v;
        grafo[u].push_back(v);
        grafo[v].push_back(u);
    }
    for(int i=1; i<=n; i++) aux[i] = grafo[i];
    for(int i=1; i<=n; i++) if(!mark[i]){
        assert(s.empty());
        compress(i);
    }
    for(int i=1; i<=n; i++) grafo[i].clear();
    set<pair<int,int>> edges;
    for(int i=1; i<=n; i++){
        if(!color[i]) color[i] = ++c;
        qtd[color[i]]++;
    }
    for(int i=1; i<=n; i++){
        for(int e : aux[i]){
            int u = color[i], v = color[e];
            if(u > v) swap(u, v);
            if(u == v or edges.count({u, v})) continue;
            edges.insert({u, v});
            grafo[u].push_back(v);
            grafo[v].push_back(u);
        }
    }
    int ans = 0;
    for(int i=1; i<=c; i++){
        if(!sz[i]) ans += solve(i);
    }
    for(int i=1; i<=n; i++){
        //cout << color[i] << " " << qtd2[color[i]] << endl;
    }
    cout << ans << "\n";
    /*
6 7
1 2
2 3
3 1
3 4
4 5
5 6
6 4

8 9
1 2
2 3
3 4
4 2
1 5
5 6
6 7
7 8
8 5
    */
    return 0;
}

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 5100 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 5100 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 81 ms 20972 KB Output is correct
2 Correct 84 ms 20972 KB Output is correct
3 Correct 126 ms 20972 KB Output is correct
4 Correct 112 ms 20660 KB Output is correct
5 Correct 137 ms 18028 KB Output is correct
6 Correct 153 ms 20588 KB Output is correct
7 Correct 157 ms 19692 KB Output is correct
8 Correct 169 ms 20076 KB Output is correct
9 Correct 150 ms 18924 KB Output is correct
10 Correct 131 ms 18540 KB Output is correct
11 Correct 100 ms 16492 KB Output is correct
12 Correct 104 ms 16492 KB Output is correct
13 Correct 103 ms 16492 KB Output is correct
14 Correct 90 ms 16364 KB Output is correct
15 Correct 85 ms 16272 KB Output is correct
16 Correct 88 ms 15724 KB Output is correct
17 Correct 9 ms 8684 KB Output is correct
18 Correct 9 ms 8812 KB Output is correct
19 Correct 9 ms 8684 KB Output is correct
20 Correct 9 ms 8556 KB Output is correct
21 Correct 9 ms 8428 KB Output is correct
22 Correct 9 ms 8428 KB Output is correct

Subtask #4
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 5228 KB Output is correct
2 Correct 4 ms 5228 KB Output is correct
3 Correct 4 ms 5228 KB Output is correct
4 Correct 5 ms 5356 KB Output is correct
5 Correct 4 ms 5228 KB Output is correct
6 Correct 4 ms 5228 KB Output is correct
7 Correct 4 ms 5228 KB Output is correct
8 Correct 5 ms 5228 KB Output is correct
9 Correct 4 ms 5228 KB Output is correct
10 Correct 4 ms 5228 KB Output is correct
11 Correct 4 ms 5228 KB Output is correct
12 Correct 4 ms 5228 KB Output is correct
13 Correct 4 ms 5228 KB Output is correct
14 Correct 4 ms 5228 KB Output is correct
15 Correct 6 ms 5228 KB Output is correct
16 Correct 4 ms 5228 KB Output is correct
17 Correct 4 ms 5228 KB Output is correct
18 Correct 4 ms 5228 KB Output is correct
19 Correct 4 ms 5228 KB Output is correct
20 Correct 5 ms 5228 KB Output is correct

Subtask #5
13.0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 192 ms 22508 KB Output is correct
2 Correct 175 ms 22508 KB Output is correct
3 Correct 191 ms 22508 KB Output is correct
4 Correct 191 ms 22636 KB Output is correct
5 Correct 180 ms 22508 KB Output is correct
6 Correct 214 ms 26796 KB Output is correct
7 Correct 190 ms 25452 KB Output is correct
8 Correct 216 ms 24684 KB Output is correct
9 Correct 187 ms 23916 KB Output is correct
10 Correct 176 ms 22508 KB Output is correct
11 Correct 171 ms 22508 KB Output is correct
12 Correct 179 ms 22508 KB Output is correct
13 Correct 174 ms 22508 KB Output is correct
14 Correct 159 ms 21612 KB Output is correct
15 Correct 144 ms 20588 KB Output is correct
16 Correct 87 ms 17004 KB Output is correct
17 Correct 150 ms 22496 KB Output is correct
18 Correct 148 ms 22592 KB Output is correct
19 Correct 153 ms 22612 KB Output is correct
20 Correct 145 ms 22492 KB Output is correct

Subtask #6
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 5228 KB Output is correct
2 Correct 4 ms 5228 KB Output is correct
3 Incorrect 4 ms 5228 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 196 ms 22840 KB Output is correct
2 Correct 185 ms 22508 KB Output is correct
3 Incorrect 180 ms 19948 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 5100 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 3 ms 5100 KB Output isn't correct
2 Halted 0 ms 0 KB -