oj.uz

Submission #828236

# Submission time Handle Problem Language Result Execution time Memory
828236 2023-08-17T07:03:20 Z jlallas384 Parachute rings (IOI12_rings) C++17
55 / 100
 4000 ms 208116 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;
        for(int x: ans){
            proc(x);
            for(int u: g[x]){
                proc(u, 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 1 ms 308 KB Output is correct
2 Correct 2 ms 980 KB Output is correct
3 Correct 3 ms 980 KB Output is correct
4 Correct 1 ms 440 KB Output is correct
5 Correct 2 ms 980 KB Output is correct
6 Correct 3 ms 1492 KB Output is correct
7 Correct 1 ms 852 KB Output is correct
8 Correct 3 ms 980 KB Output is correct
9 Correct 3 ms 1108 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 552 ms 92504 KB Output is correct
2 Correct 1083 ms 117376 KB Output is correct
3 Correct 1286 ms 121272 KB Output is correct
4 Correct 1382 ms 176968 KB Output is correct
5 Correct 1471 ms 178152 KB Output is correct
6 Correct 1779 ms 208116 KB Output is correct
7 Correct 1253 ms 119516 KB Output is correct
8 Correct 1318 ms 159532 KB Output is correct
9 Correct 1409 ms 174884 KB Output is correct
10 Correct 1043 ms 172940 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 308 KB Output is correct
2 Correct 2 ms 980 KB Output is correct
3 Correct 3 ms 980 KB Output is correct
4 Correct 1 ms 440 KB Output is correct
5 Correct 2 ms 980 KB Output is correct
6 Correct 3 ms 1492 KB Output is correct
7 Correct 1 ms 852 KB Output is correct
8 Correct 3 ms 980 KB Output is correct
9 Correct 3 ms 1108 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 2188 KB Output is correct
13 Correct 5 ms 2004 KB Output is correct
14 Correct 173 ms 1492 KB Output is correct
15 Correct 288 ms 2564 KB Output is correct
16 Correct 5 ms 2132 KB Output is correct
17 Correct 5 ms 1620 KB Output is correct
18 Correct 7 ms 2644 KB Output is correct
19 Correct 5 ms 2260 KB Output is correct
20 Correct 5 ms 2132 KB Output is correct

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 308 KB Output is correct
2 Correct 2 ms 980 KB Output is correct
3 Correct 3 ms 980 KB Output is correct
4 Correct 1 ms 440 KB Output is correct
5 Correct 2 ms 980 KB Output is correct
6 Correct 3 ms 1492 KB Output is correct
7 Correct 1 ms 852 KB Output is correct
8 Correct 3 ms 980 KB Output is correct
9 Correct 3 ms 1108 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 2188 KB Output is correct
13 Correct 5 ms 2004 KB Output is correct
14 Correct 173 ms 1492 KB Output is correct
15 Correct 288 ms 2564 KB Output is correct
16 Correct 5 ms 2132 KB Output is correct
17 Correct 5 ms 1620 KB Output is correct
18 Correct 7 ms 2644 KB Output is correct
19 Correct 5 ms 2260 KB Output is correct
20 Correct 5 ms 2132 KB Output is correct
21 Correct 22 ms 7736 KB Output is correct
22 Correct 39 ms 12140 KB Output is correct
23 Correct 54 ms 15212 KB Output is correct
24 Execution timed out 4062 ms 10420 KB Time limit exceeded
25 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 308 KB Output is correct
2 Correct 2 ms 980 KB Output is correct
3 Correct 3 ms 980 KB Output is correct
4 Correct 1 ms 440 KB Output is correct
5 Correct 2 ms 980 KB Output is correct
6 Correct 3 ms 1492 KB Output is correct
7 Correct 1 ms 852 KB Output is correct
8 Correct 3 ms 980 KB Output is correct
9 Correct 3 ms 1108 KB Output is correct
10 Correct 3 ms 1108 KB Output is correct
11 Correct 552 ms 92504 KB Output is correct
12 Correct 1083 ms 117376 KB Output is correct
13 Correct 1286 ms 121272 KB Output is correct
14 Correct 1382 ms 176968 KB Output is correct
15 Correct 1471 ms 178152 KB Output is correct
16 Correct 1779 ms 208116 KB Output is correct
17 Correct 1253 ms 119516 KB Output is correct
18 Correct 1318 ms 159532 KB Output is correct
19 Correct 1409 ms 174884 KB Output is correct
20 Correct 1043 ms 172940 KB Output is correct
21 Correct 3 ms 1108 KB Output is correct
22 Correct 5 ms 2188 KB Output is correct
23 Correct 5 ms 2004 KB Output is correct
24 Correct 173 ms 1492 KB Output is correct
25 Correct 288 ms 2564 KB Output is correct
26 Correct 5 ms 2132 KB Output is correct
27 Correct 5 ms 1620 KB Output is correct
28 Correct 7 ms 2644 KB Output is correct
29 Correct 5 ms 2260 KB Output is correct
30 Correct 5 ms 2132 KB Output is correct
31 Correct 22 ms 7736 KB Output is correct
32 Correct 39 ms 12140 KB Output is correct
33 Correct 54 ms 15212 KB Output is correct
34 Execution timed out 4062 ms 10420 KB Time limit exceeded
35 Halted 0 ms 0 KB -