oj.uz

Submission #417911

# Submission time Handle Problem Language Result Execution time Memory
417911 2021-06-04T13:46:13 Z nicolaalexandra Joker (BOI20_joker) C++14
25 / 100
 1178 ms 9604 KB 
#include <bits/stdc++.h>
#define DIM 400010
using namespace std;

int fth[DIM],Size[DIM],dp[DIM];
pair <int,int> mch[DIM];
deque <pair<int,int> > s;
int n,m,q,x,y,i,first;

int get_rad (int x){
    while (fth[x] != x)
        x = fth[x];
    return x;
}

int uneste (int x, int y, int &cnt){
    int radx = get_rad (x), rady = get_rad (y);
    if (radx == rady)
        return 0;

    cnt++;

    if (Size[radx] < Size[rady])
        swap (radx,rady);

    s.push_back(make_pair(radx,rady));
    Size[radx] += Size[rady];
    fth[rady] = radx;

    return 1;
}

void undo(){
    int x = s.back().first, y = s.back().second;
    s.pop_back();
    Size[x] -= Size[y];
    fth[y] = y;
}

void solve (int st, int dr, int opt_st, int opt_dr){
    if (st > dr)
        return;
    int mid = (st+dr)>>1, opt_mid;

    /// adaug tot pana la mid
    int ok = 0;
    int cnt = 0; /// de cate ori fac unirile efective
    for (int i=max(1,st-1);i<mid;i++){
        int x = mch[i].first, y = mch[i].second;

        if (!uneste(x,y,cnt)){
            ok = 1;
            break;
        } else undo(), cnt--;

        uneste (x,y+n,cnt);
        uneste (x+n,y,cnt);
    }

    if (ok || first <= mid){ /// se strica proprietatea de bipartit pana sa ajung la mid
        dp[mid] = m+1;
        opt_mid = m+1;
        first = min (first,mid);

    } else {
        for (opt_mid = min(m,opt_dr); opt_mid >= mid ; opt_mid--){

            /// adaug muchia asta si vad daca se pastreaza propr de bipartit
            int x = mch[opt_mid].first, y = mch[opt_mid].second;

            if (!uneste(x,y,cnt)){
                break;
            } else undo(),cnt--;

            uneste (x,y+n,cnt); /// muchiile astea vin ca la 2sat
            uneste (x+n,y,cnt);
        }

        dp[mid] = opt_mid;
    }

    /// trb sa construiesc padurile special pt urmatorul apel

    /// dau undo la toate si mai adaug dupa de la opt_mid la opt_dr
    for (int i=1;i<=cnt;i++)
        undo();

    int val = 0;
    for (int i=opt_dr;i>opt_mid;i--){
        int x = mch[i].first, y = mch[i].second;
        uneste (x,y+n,val);
        uneste (x+n,y,val);
    }

    solve (st,mid-1,opt_st,opt_mid);

    for (int i=1;i<=val;i++)
        undo();

    int val2 = 0;
    for (int i=st;i<mid;i++){
        int x = mch[i].first, y = mch[i].second;
        uneste (x,y+n,val2);
        uneste (x+n,y,val2);
    }

    solve (mid+1,dr,opt_mid,opt_dr);

    for (int i=1;i<=val2;i++)
        undo();
}



int main (){

    //ifstream cin ("date.in");
    //ofstream cout ("date.out");

    cin>>n>>m>>q;
    for (i=1;i<=m;i++)
        cin>>mch[i].first>>mch[i].second;

    for (i=1;i<=2*n;i++)
        fth[i] = i, Size[i] = 1;
    first = m+1;
    solve (1,m,1,m+1);

    for (;q--;){
        cin>>x>>y;

        if (y >= dp[x])
            cout<<"NO\n";
        else cout<<"YES\n";
    }


    return 0;
}

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Incorrect 1 ms 332 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Incorrect 1 ms 332 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 855 ms 6480 KB Output is correct
4 Correct 1025 ms 9604 KB Output is correct
5 Correct 890 ms 8944 KB Output is correct
6 Correct 790 ms 5848 KB Output is correct
7 Correct 826 ms 5844 KB Output is correct
8 Correct 983 ms 5296 KB Output is correct
9 Correct 910 ms 6540 KB Output is correct
10 Correct 1178 ms 9200 KB Output is correct
11 Correct 871 ms 6484 KB Output is correct
12 Correct 896 ms 8688 KB Output is correct
13 Correct 797 ms 3928 KB Output is correct
14 Correct 976 ms 5248 KB Output is correct
15 Correct 1055 ms 7660 KB Output is correct
16 Correct 1150 ms 9132 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Incorrect 1 ms 332 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Incorrect 1 ms 332 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 332 KB Output is correct
11 Incorrect 1 ms 332 KB Output isn't correct
12 Halted 0 ms 0 KB -