oj.uz

답안 #1032822

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1032822 2024-07-24T09:17:56 Z _8_8_ 철인 이종 경기 (APIO18_duathlon) C++17
0 / 100
 1000 ms 292404 KB 
#include <bits/stdc++.h>
 
using namespace std;
    
typedef long long ll;
const int  N = 4e5 + 21, MOD = (int)1e9+7;
 
int n,m;

vector<vector<int>> bcc(vector<vector<int>> &g,vector<int> &sz){
    vector<bool> ap(n+1,0);
    vector<int> tin(n+1,0),up(n+1,0),id(n+1,0);
    vector<int> stk;
    vector<vector<int>> comps,G;
    function <void(int,int,int&)> dfs = [&](int v,int pr,int &t){
        tin[v] = up[v] = ++t;
        stk.push_back(v);
        int cc  =0;
        for(int to:g[v]){
            if(to == pr)continue;
            if(!tin[to]){
                dfs(to,v,t);
                cc++;
                up[v] = min(up[v],up[to]);
                if(up[to] >= tin[v]){
                    if(pr != -1){
                        ap[v] = 1;
                    }
                    comps.push_back({v});
                    while(comps.back().back() != to){
                        comps.back().push_back(stk.back());
                        stk.pop_back();
                    }  
                }
            }else{
                up[v] = min(up[v],tin[to]);
            }
        }
        if(pr == -1){
            ap[v] = (cc > 1);
        }
    };
    int timer = 0;
    for(int i = 1;i <= n;i++){
        if(!tin[i]){
            dfs(i,-1,timer);
        }
    }
    function<vector<vector<int>>()> build_tree = [&]() {
        vector<vector<int>> t(1);
        int it = 0;
        sz = vector<int> (1,0);
        for(int i = 1;i <= n;i++){
            if(ap[i]){
                id[i] = ++it;
                sz.push_back(1);
                sz[id[i]] = 1;
                t.push_back({});
            }
        }
        for(auto c:comps){
            it++;
            sz.push_back(0);
            t.push_back({});
            for(auto j:c){
                if(ap[j]){
                    t[id[j]].push_back(it);
                    t[it].push_back(id[j]);
                }else{
                    id[j] = it;
                    sz[it]++;
                }
            }
        }
        return t;
    };
    return build_tree();
}
vector<vector<int>> g(N),G;
ll calc(vector<int> &S){
    ll s = 0,d = 0,t = 0;
    for(auto i:S){
        t += i *1ll * d;
        d += s * 1ll * i;
        s += i;
    }
    return t;
}
int bf_n;
vector<int> sz,ss;
bool vis[N];
void go(int v,int pr = -1){
    vis[v] = 1;
    ss.push_back(sz[v]);
    bf_n += sz[v];
    for(int to:G[v]){
        if(to == pr)continue;
        go(to,v);
    }
}
void test(){
    cin >> n >> m;
    for(int i = 1;i <= m;i++){
        int u,v;
        cin >> u >> v;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    G = bcc(g,sz);
    n = (int)G.size() - 1;
    ll res = 0;
    for(int i = 1;i <= n;i++){
        if(!vis[i])
        {
            go(i);
            res += calc(ss);
            ss.clear();
        }
    }
    for(int i = 1;i <= n;i++){
        ll val = sz[i] * 1ll * (sz[i] - 1),k = val / 2;
        bf_n = 0;
        go(i);
        val = val * 1ll * (bf_n - sz[i]);
        res += val;
        res += k * 1ll * (ll)G[i].size();
        ll t = sz[i];
        res += t * (t - 1) / 2 * (t - 2);
    }
    cout << res * 2 << '\n';
}
int main() {
    ios_base::sync_with_stdio(false);cin.tie(0);
    int t = 1; 
    // cin >> t;
    while(t--) {
        test();
    }
}

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 9816 KB Output is correct
2 Correct 4 ms 9820 KB Output is correct
3 Correct 3 ms 9820 KB Output is correct
4 Correct 4 ms 9704 KB Output is correct
5 Correct 6 ms 9820 KB Output is correct
6 Correct 6 ms 9820 KB Output is correct
7 Incorrect 3 ms 9820 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 9816 KB Output is correct
2 Correct 4 ms 9820 KB Output is correct
3 Correct 3 ms 9820 KB Output is correct
4 Correct 4 ms 9704 KB Output is correct
5 Correct 6 ms 9820 KB Output is correct
6 Correct 6 ms 9820 KB Output is correct
7 Incorrect 3 ms 9820 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 39 ms 29516 KB Output is correct
2 Correct 41 ms 30612 KB Output is correct
3 Execution timed out 1045 ms 292404 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 29 ms 26560 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1073 ms 289928 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 33 ms 26552 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1048 ms 289820 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #8
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 9816 KB Output is correct
2 Correct 4 ms 9820 KB Output is correct
3 Correct 3 ms 9820 KB Output is correct
4 Correct 4 ms 9704 KB Output is correct
5 Correct 6 ms 9820 KB Output is correct
6 Correct 6 ms 9820 KB Output is correct
7 Incorrect 3 ms 9820 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 9816 KB Output is correct
2 Correct 4 ms 9820 KB Output is correct
3 Correct 3 ms 9820 KB Output is correct
4 Correct 4 ms 9704 KB Output is correct
5 Correct 6 ms 9820 KB Output is correct
6 Correct 6 ms 9820 KB Output is correct
7 Incorrect 3 ms 9820 KB Output isn't correct
8 Halted 0 ms 0 KB -