oj.uz

Submission #828241

# Submission time Handle Problem Language Result Execution time Memory
828241 2023-08-17T07:05:19 Z jlallas384 Parachute rings (IOI12_rings) C++17
55 / 100
 1643 ms 207724 KB 
#include <bits/stdc++.h>
using namespace std;
 
 
 
struct ufds{
    vector<int> sz, par;
    ufds(){}
    ufds(int n): sz(n, 1), par(n){
        iota(par.begin(), par.end(), 0);
    }
    int find(int a){
        return par[a] == a ? a : par[a] = find(par[a]);
    }
    int unite(int a, int b){
        a = find(a), b = find(b);
        if(a == b) return 0;
        if(sz[a] < sz[b]) swap(a, b);
        par[b] = a;
        sz[a] += sz[b];
        return 1;
    }
};
 
set<int> ans;
vector<vector<int>> g, tree;
vector<int> deg;
int n = 0;
ufds ds;
 
int bad = 0;
int d4 = 0;
 
void Init(int N){
    assert(n == 0);
    n = N;
    g.resize(n);
    tree.resize(n);
    deg.resize(n);
    for(int i = 0; i < n; i++){
        ans.insert(i);
    }
    ds = ufds(n);
}
 
void proc(int a, int add = 1){
    if(deg[a] == 4){
        if(add){
            d4++;
            if(d4 == 2) ans = {}, bad = 1;
        }
        if(!ans.count(a)) ans = {};
        else ans = {a};
    }else if(deg[a] == 3){
        set<int> nans;
        if(ans.count(a)) nans.insert(a);
        for(int u: g[a]){
            if(ans.count(u)) nans.insert(u);
        }
        ans = nans;
    }
}
 
int CountCritical(){    
    if(bad) return 0;
    else return ans.size();
}
 
 
 
 
int cyc = 0;
 
vector<int> path;
int dfs(int v, int p, int x){
    path.push_back(v);
    if(v == x) return 1;
    for(int u: tree[v]) if(u != p){
        if(dfs(u, v, x)) return 1;
    }
    path.pop_back();
    return 0;
}
 
vector<pair<int,int>> eds;
map<int, ufds> mp;
 
void Link(int a, int b){
    int res = ds.unite(a, b);
    deg[a]++, deg[b]++;
    g[a].push_back(b);
    g[b].push_back(a);
    eds.emplace_back(a, b);
    proc(a), proc(b);
    if(cyc == 2){
        set<int> nans;
        for(int x: ans){
            int bad = 0;
            if(a != x && b != x && !mp[x].unite(a, b)){
                bad = 1;
            }
            if(!bad) nans.insert(x);
        }
        ans = nans;
        proc(a, 0), proc(b, 0);
        assert(ans.size() <= 2);
    }
    if(!res){
        if(!cyc){
            dfs(a, -1, b);
            ans = {};
            for(int x: path){
                ans.insert(x);
            }
            for(int i = 0; i < n; i++){
                proc(i, 0);
            }
            cyc = 1;
        }else{
            if(cyc == 1){
                set<int> nans;
                for(int x: ans) if(deg[x] >= 3){
                    ufds f(n);
                    int tbad = 0;
                    for(auto [u, v]: eds){
                        if(u != x && v != x){
                            if(!f.unite(u, v)) tbad = 1;
                        }
                    }
                    if(!tbad) nans.insert(x), mp[x] = f;;
                }
                ans = nans;
                assert(ans.size() <= 2);
            }
            cyc = 2;
        }
    }else{
        tree[a].push_back(b);
        tree[b].push_back(a);
    }
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 2 ms 852 KB Output is correct
3 Correct 3 ms 980 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 2 ms 852 KB Output is correct
6 Correct 3 ms 1456 KB Output is correct
7 Correct 2 ms 852 KB Output is correct
8 Correct 2 ms 980 KB Output is correct
9 Correct 3 ms 980 KB Output is correct
10 Correct 3 ms 1108 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 520 ms 91872 KB Output is correct
2 Correct 1048 ms 116780 KB Output is correct
3 Correct 1247 ms 120608 KB Output is correct
4 Correct 1357 ms 176272 KB Output is correct
5 Correct 1377 ms 177656 KB Output is correct
6 Correct 1643 ms 207724 KB Output is correct
7 Correct 1194 ms 119136 KB Output is correct
8 Correct 1271 ms 159100 KB Output is correct
9 Correct 1350 ms 174388 KB Output is correct
10 Correct 999 ms 172552 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 2 ms 852 KB Output is correct
3 Correct 3 ms 980 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 2 ms 852 KB Output is correct
6 Correct 3 ms 1456 KB Output is correct
7 Correct 2 ms 852 KB Output is correct
8 Correct 2 ms 980 KB Output is correct
9 Correct 3 ms 980 KB Output is correct
10 Correct 3 ms 1108 KB Output is correct
11 Correct 3 ms 1108 KB Output is correct
12 Correct 5 ms 2004 KB Output is correct
13 Correct 5 ms 1960 KB Output is correct
14 Correct 5 ms 1364 KB Output is correct
15 Correct 6 ms 2388 KB Output is correct
16 Correct 5 ms 2132 KB Output is correct
17 Correct 5 ms 1620 KB Output is correct
18 Correct 9 ms 2516 KB Output is correct
19 Correct 5 ms 2132 KB Output is correct
20 Correct 6 ms 2004 KB Output is correct

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 2 ms 852 KB Output is correct
3 Correct 3 ms 980 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 2 ms 852 KB Output is correct
6 Correct 3 ms 1456 KB Output is correct
7 Correct 2 ms 852 KB Output is correct
8 Correct 2 ms 980 KB Output is correct
9 Correct 3 ms 980 KB Output is correct
10 Correct 3 ms 1108 KB Output is correct
11 Correct 3 ms 1108 KB Output is correct
12 Correct 5 ms 2004 KB Output is correct
13 Correct 5 ms 1960 KB Output is correct
14 Correct 5 ms 1364 KB Output is correct
15 Correct 6 ms 2388 KB Output is correct
16 Correct 5 ms 2132 KB Output is correct
17 Correct 5 ms 1620 KB Output is correct
18 Correct 9 ms 2516 KB Output is correct
19 Correct 5 ms 2132 KB Output is correct
20 Correct 6 ms 2004 KB Output is correct
21 Correct 22 ms 7596 KB Output is correct
22 Correct 36 ms 11948 KB Output is correct
23 Correct 49 ms 14972 KB Output is correct
24 Correct 54 ms 10268 KB Output is correct
25 Correct 28 ms 10916 KB Output is correct
26 Incorrect 50 ms 10516 KB Output isn't correct
27 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 2 ms 852 KB Output is correct
3 Correct 3 ms 980 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 2 ms 852 KB Output is correct
6 Correct 3 ms 1456 KB Output is correct
7 Correct 2 ms 852 KB Output is correct
8 Correct 2 ms 980 KB Output is correct
9 Correct 3 ms 980 KB Output is correct
10 Correct 3 ms 1108 KB Output is correct
11 Correct 520 ms 91872 KB Output is correct
12 Correct 1048 ms 116780 KB Output is correct
13 Correct 1247 ms 120608 KB Output is correct
14 Correct 1357 ms 176272 KB Output is correct
15 Correct 1377 ms 177656 KB Output is correct
16 Correct 1643 ms 207724 KB Output is correct
17 Correct 1194 ms 119136 KB Output is correct
18 Correct 1271 ms 159100 KB Output is correct
19 Correct 1350 ms 174388 KB Output is correct
20 Correct 999 ms 172552 KB Output is correct
21 Correct 3 ms 1108 KB Output is correct
22 Correct 5 ms 2004 KB Output is correct
23 Correct 5 ms 1960 KB Output is correct
24 Correct 5 ms 1364 KB Output is correct
25 Correct 6 ms 2388 KB Output is correct
26 Correct 5 ms 2132 KB Output is correct
27 Correct 5 ms 1620 KB Output is correct
28 Correct 9 ms 2516 KB Output is correct
29 Correct 5 ms 2132 KB Output is correct
30 Correct 6 ms 2004 KB Output is correct
31 Correct 22 ms 7596 KB Output is correct
32 Correct 36 ms 11948 KB Output is correct
33 Correct 49 ms 14972 KB Output is correct
34 Correct 54 ms 10268 KB Output is correct
35 Correct 28 ms 10916 KB Output is correct
36 Incorrect 50 ms 10516 KB Output isn't correct
37 Halted 0 ms 0 KB -