oj.uz

Submission #800120

# Submission time Handle Problem Language Result Execution time Memory
800120 2023-08-01T10:29:26 Z TB_ Joker (BOI20_joker) C++17
0 / 100
 208 ms 63692 KB 
#include <bits/stdc++.h>
using namespace std;

// #undef _GLIBCXX_DEBUG                // disable run-time bound checking, etc
// #pragma GCC optimize("Ofast,inline") // Ofast = O3,fast-math,allow-store-data-races,no-protect-parens
// #pragma GCC optimize ("unroll-loops")

// #pragma GCC target("bmi,bmi2,lzcnt,popcnt")                      // bit manipulation
// #pragma GCC target("movbe")                                      // byte swap
// #pragma GCC target("aes,pclmul,rdrnd")                           // encryption
// #pragma GCC target("avx,avx2,f16c,fma,sse3,ssse3,sse4.1,sse4.2") // SIMD

// #include <bits/extc++.h>
// using namespace __gnu_pbds;
// template<class T>using ordered_set = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;
// template<class T>using ordered_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define ll long long
#define INF (ll)1e9+7
#define fo(i, n) for(int i=0;i<((ll)n);i++)
#define deb(x) cout << #x << " = " << x << endl;
#define deb2(x, y) cout << #x << " = " << x << ", " << #y << " = " << y << endl
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define LSOne(S) ((S) & (-S))
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
inline int readint(){ int v = 0; char c; while((c = getchar()) != EOF && c != ' ' && c != '\n'){ v *= 10; v += c - '0'; } return v; }
inline int readintsigned() { int v = 0; int sign = 1; char c = getchar(); if (c == '-') { sign = -1; } else { v += c - '0'; } while ((c = getchar()) != EOF && c != ' ' && c != '\n') { v *= 10; v += c - '0'; } return v * sign; }
inline string readstring() { string s; char c; while ((c = getchar()) != EOF && c != '\n' && c != ' ') { s.push_back(c); } return s; }
template <class result_t=std::chrono::milliseconds,class clock_t=std::chrono::steady_clock,class duration_t = std::chrono::milliseconds>
auto since(std::chrono::time_point<clock_t, duration_t> const& start){return std::chrono::duration_cast<result_t>(clock_t::now() - start);}
typedef pair<int, int> pii;
typedef pair<ll, ll> pl;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vpii;
typedef vector<pl> vpl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef vector<vpii> vvpii;
typedef vector<vpl> vvpl;



struct UnionFind{
    vl degree, height, p, siz;
    vector<vvpl> updates; // pUpdates, heightUpdate, sizUpdate
    vi possibleUpdate;
    int n;
    int possible = 0;
    UnionFind(int n) : n(n) {
        height.assign(n, 0);
        degree.assign(n, 0); 
        p.assign(n, 0); 
        siz.assign(n, 1); 
        fo(i, n) p[i] = i;
    }

    int find(int x){
        if(x == p[x]) return x;
        updates[updates.size()-1][0].pb({x, p[x]});
        updates[updates.size()-1][1].pb({x, height[x]});
        int res = find(p[x]);
        height[x] = height[p[x]]+1;
        return p[x] = res;
    }


    void addEdge(int a, int b){
        possibleUpdate.pb(possible);
        updates.pb({{}, {}, {}});
        int a2 = find(a);
        int b2 = find(b);
        if(a2==b2){
            if(height[a]%2 == height[b]%2) possible++;
        }else{
            if(siz[b2] > siz[a2]) swap(a, b);
            updates[updates.size()-1][2].pb({a, siz[a]});
            updates[updates.size()-1][0].pb({b, p[b]});
            siz[a] += siz[b];
            p[b] = a;
        }
    }  


    void backtrack(){
        possible = possibleUpdate[possibleUpdate.size()-1];
        for(auto up : updates[possibleUpdate.size()-1][0]) p[up.F] = up.S;
        for(auto up : updates[possibleUpdate.size()-1][1]) height[up.F] = up.S;
        for(auto up : updates[possibleUpdate.size()-1][2]) siz[up.F] = up.S;
        updates.pop_back();
        possibleUpdate.pop_back();
    }  
};


int main() {
    // cout << fixed << setprecision(20);
    // auto start = std::chrono::steady_clock::now(); // since(start).count()
    cin.tie(0)->sync_with_stdio(0);

    int n, m, q, from, to, que;
    vpl edges;
    cin >> n >> m >> q;
    fo(i, m){
        cin >> from >> to;
        edges.pb({from-1, to-1});
    }

    vector<vector<tuple<int, int, int>>> queries(1000);
    fo(x, q){
        cin >> from >> to;
        queries[from/((int)sqrt(n))].pb({to-1, from-1, x});
    }
    fo(i, 1000){
        sort(rall(queries[i]));
    }
    UnionFind uf(n);
    vi ans(q, 0);
    fo(section, 1000){
        int lo = 0, hi = m-1;
        for(auto query : queries[section]){
            tie(to, from, que) = query;
            fo(i, hi-to) uf.addEdge(edges[hi-i].F,edges[hi-i].S);
            hi=to;

            fo(i, from-lo) 
                uf.addEdge(edges[lo+i].F, edges[lo+i].S);
            if(uf.possible) ans[que] = 1;
            fo(i, from-((int)sqrt(n))*section)
                uf.backtrack();
            lo = ((int)sqrt(n))*section;
        }
        while(uf.possibleUpdate.size())
            uf.backtrack();
    }
    fo(i, q) cout << (ans[i]?"YES\n":"NO\n");


    return 0;
}

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Incorrect 1 ms 340 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Incorrect 1 ms 340 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 208 ms 63692 KB Output is correct
4 Correct 191 ms 63492 KB Output is correct
5 Incorrect 186 ms 63388 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Incorrect 1 ms 340 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Incorrect 1 ms 340 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 320 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Incorrect 1 ms 340 KB Output isn't correct
7 Halted 0 ms 0 KB -