oj.uz

Submission #828193

# Submission time Handle Problem Language Result Execution time Memory
828193 2023-08-17T06:32:24 Z jlallas384 Parachute rings (IOI12_rings) C++17
20 / 100
 4000 ms 116804 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 = {};
        }
        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) if(x != a && x != b){
            int bad = 0;
            if(!mp[x].unite(a, b)){
                bad = 1;
            }
            if(!bad) nans.insert(x);
        }
        ans = nans;
        assert(ans.size() <= 2);
        for(int i = 0; i < n; i++){
            proc(i, 0);
        }
    }
    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){
                    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;
                for(int i = 0; i < n; i++){
                    proc(i, 0);
                }
            }
            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 4 ms 1004 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 2 ms 852 KB Output is correct
6 Correct 4 ms 1364 KB Output is correct
7 Correct 1 ms 852 KB Output is correct
8 Correct 5 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
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 500 ms 91868 KB Output is correct
2 Correct 1042 ms 116804 KB Output is correct
3 Execution timed out 4057 ms 106796 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #3
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 4 ms 1004 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 2 ms 852 KB Output is correct
6 Correct 4 ms 1364 KB Output is correct
7 Correct 1 ms 852 KB Output is correct
8 Correct 5 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 15 ms 1108 KB Output is correct
12 Correct 12 ms 2004 KB Output is correct
13 Correct 24 ms 1956 KB Output is correct
14 Incorrect 221 ms 1364 KB Output isn't correct
15 Halted 0 ms 0 KB -

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 4 ms 1004 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 2 ms 852 KB Output is correct
6 Correct 4 ms 1364 KB Output is correct
7 Correct 1 ms 852 KB Output is correct
8 Correct 5 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 15 ms 1108 KB Output is correct
12 Correct 12 ms 2004 KB Output is correct
13 Correct 24 ms 1956 KB Output is correct
14 Incorrect 221 ms 1364 KB Output isn't correct
15 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 4 ms 1004 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 2 ms 852 KB Output is correct
6 Correct 4 ms 1364 KB Output is correct
7 Correct 1 ms 852 KB Output is correct
8 Correct 5 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 500 ms 91868 KB Output is correct
12 Correct 1042 ms 116804 KB Output is correct
13 Execution timed out 4057 ms 106796 KB Time limit exceeded
14 Halted 0 ms 0 KB -