oj.uz

Submission #828144

# Submission time Handle Problem Language Result Execution time Memory
828144 2023-08-17T05:58:49 Z jlallas384 Parachute rings (IOI12_rings) C++17
37 / 100
 1696 ms 207764 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;
ufds ds;
 
int bad = 0;
int d4 = 0;
 
void Init(int N){
    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) 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){
    if(bad) return;
    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(mp.size()){
        set<int> nans;
        for(int x: ans) if(x != a && x != b){
            int bad = 0;
            if(!mp[x].unite(a, b)){
                bad = 1;
            }
            if(!bad) nans.insert(x);
        }
        ans = nans;
    }
    if(!res){
        if(!cyc){
            dfs(a, -1, b);
            ans = {};
            for(int x: path){
                ans.insert(x);
            }
            cyc = 1;
        }else{
            if(ans.size() >= 3) ans = {}, bad = 1;
            if(mp.size() == 0){
                set<int> nans;
                for(int x: ans){
                    mp[x] = ufds(n);
                    int tbad = 0;
                    for(auto [u, v]: eds){
                        if(u != x && v != x){
                            if(!mp[x].unite(u, v)) tbad = 1;
                        }
                    }
                    if(!tbad) nans.insert(x);
                }
                ans = nans;
            }
        }
    }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 1 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 1364 KB Output is correct
7 Correct 1 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 499 ms 91976 KB Output is correct
2 Correct 1027 ms 116916 KB Output is correct
3 Correct 368 ms 107004 KB Output is correct
4 Correct 1451 ms 176392 KB Output is correct
5 Correct 1405 ms 177952 KB Output is correct
6 Correct 1696 ms 207764 KB Output is correct
7 Correct 366 ms 107212 KB Output is correct
8 Correct 1255 ms 159104 KB Output is correct
9 Correct 1352 ms 174392 KB Output is correct
10 Correct 976 ms 172244 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 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 1364 KB Output is correct
7 Correct 1 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 Incorrect 3 ms 1108 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 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 1364 KB Output is correct
7 Correct 1 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 Incorrect 3 ms 1108 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 1 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 1364 KB Output is correct
7 Correct 1 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 499 ms 91976 KB Output is correct
12 Correct 1027 ms 116916 KB Output is correct
13 Correct 368 ms 107004 KB Output is correct
14 Correct 1451 ms 176392 KB Output is correct
15 Correct 1405 ms 177952 KB Output is correct
16 Correct 1696 ms 207764 KB Output is correct
17 Correct 366 ms 107212 KB Output is correct
18 Correct 1255 ms 159104 KB Output is correct
19 Correct 1352 ms 174392 KB Output is correct
20 Correct 976 ms 172244 KB Output is correct
21 Incorrect 3 ms 1108 KB Output isn't correct
22 Halted 0 ms 0 KB -