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Submission #258626

# Submission time Handle Problem Language Result Execution time Memory
258626 2020-08-06T09:25:14 Z Diuven Joker (BOI20_joker) C++14
14 / 100
 2000 ms 12904 KB 
#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> pii;
const int MAX = 200010;
struct edge_t { int u, v; };
struct stat_t { int x, p, s, b; };
inline int _min(int a, int b){ return a<b ? a : b; }
inline int _max(int a, int b){ return a>b ? a : b; }


class bipuf {
    bool bip;
    int n, U[MAX*2], S[MAX*2];
    vector<stat_t> hist;
    int find(int x){
        return x==U[x] ? x : find(U[x]);
    }
    stat_t unite(int u, int v){
        u = find(u), v = find(v);
        stat_t bef = {0, 0, 0, bip};
        if(u==v) return bef;
        if(S[u]>S[v]) swap(u, v);
        bef = {u, U[u], S[v], bip};
        U[u] = v; S[v] += S[u];
        return bef;
    }
    void revert(stat_t st){
        bip = st.b;
        int v = st.x;
        if(v==0) return;
        S[U[v]] = st.s;
        U[v] = st.p;
    }
public:
    bipuf(int sz){
        bip = true;
        n = 2*sz+1;
        iota(U+1, U+n+1, 1);
        fill(S+1, S+n+1, 1);
    }
    void add_edge(edge_t e){
        int u = e.u, v = e.v;
        stat_t st1 = unite(u*2, v*2+1);
        stat_t st2 = unite(u*2+1, v*2);
        if(find(u*2) == find(u*2+1) || find(v*2) == find(v*2+1))
            bip = false;
        hist.push_back(st1);
        hist.push_back(st2);
    }
    void pop_edge(){
        stat_t st2 = hist.back(); hist.pop_back();
        stat_t st1 = hist.back(); hist.pop_back();
        revert(st2); revert(st1);
    }
    bool is_bip(){
        return bip;
    }
};

int n, m, q;
edge_t E[MAX];
int pos[MAX];
// pos[l] : using ([1,l] + [pos[l], m]) is bipartite

void solve(int s, int e, int l, int r, bipuf &UF){
    // UF set as [1, s) + (r, m]
    if(e>s) return;
    int mid = (s+e)/2, &p = pos[mid];
    for(int i=_max(1, s); i<=mid; i++)
        UF.add_edge(E[i]);
    // [1, mid] + (r, m]
    int bgn = _min(r, m), fin = _max(l, mid+1);
    for(int i=bgn; i>=fin; i--){
        UF.add_edge(E[i]);
        if(UF.is_bip()) p=i;
    }
    int sto = _min(bgn, p);
    // [1, mid] + [fin, m]
    for(int i=fin; i<=sto; i++)
        UF.pop_edge();
    // [1, mid] + (sto, m]

    solve(s, mid-1, l, p, UF);
    // set UF
    solve(mid+1, e, p, r, UF);
}



int main(){
    ios::sync_with_stdio(0); cin.tie(0);

    cin>>n>>m>>q;

    for(int i=1; i<=m; i++){
        int u, v; cin>>u>>v;
        E[i] = {u, v};
    }
    fill(pos, pos+m+1, m+2);

    static bipuf UF(n);

//    solve(0, m, 1, m+1, UF);

    for(int i=1; i<=q; i++){
        int l, r; cin>>l>>r;
        for(int j=1; j<l; j++)
            UF.add_edge(E[j]);
        for(int j=m; j>r; j--)
            UF.add_edge(E[j]);
        cout<<(UF.is_bip() ? "NO" : "YES")<<'\n';
        for(int j=1; j<l; j++)
            UF.pop_edge();
        for(int j=m; j>r; j--)
            UF.pop_edge();
//        cout<<(pos[l-1] <= r+1 ? "NO" : "YES")<<'\n';
    }

}

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 2 ms 384 KB Output is correct
22 Correct 2 ms 384 KB Output is correct
23 Correct 2 ms 384 KB Output is correct
24 Correct 1 ms 384 KB Output is correct
25 Correct 2 ms 384 KB Output is correct
26 Correct 1 ms 384 KB Output is correct
27 Correct 2 ms 436 KB Output is correct
28 Correct 1 ms 384 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 2 ms 384 KB Output is correct
22 Correct 2 ms 384 KB Output is correct
23 Correct 2 ms 384 KB Output is correct
24 Correct 1 ms 384 KB Output is correct
25 Correct 2 ms 384 KB Output is correct
26 Correct 1 ms 384 KB Output is correct
27 Correct 2 ms 436 KB Output is correct
28 Correct 1 ms 384 KB Output is correct
29 Correct 73 ms 544 KB Output is correct
30 Correct 95 ms 632 KB Output is correct
31 Correct 116 ms 624 KB Output is correct
32 Correct 107 ms 512 KB Output is correct
33 Correct 114 ms 512 KB Output is correct
34 Correct 108 ms 636 KB Output is correct
35 Correct 117 ms 632 KB Output is correct
36 Correct 71 ms 632 KB Output is correct
37 Correct 113 ms 632 KB Output is correct
38 Correct 132 ms 632 KB Output is correct
39 Correct 82 ms 640 KB Output is correct
40 Correct 98 ms 632 KB Output is correct
41 Correct 95 ms 632 KB Output is correct
42 Correct 94 ms 632 KB Output is correct
43 Correct 200 ms 632 KB Output is correct
44 Correct 199 ms 632 KB Output is correct
45 Correct 194 ms 636 KB Output is correct
46 Correct 178 ms 632 KB Output is correct
47 Correct 94 ms 632 KB Output is correct
48 Correct 97 ms 632 KB Output is correct
49 Correct 100 ms 632 KB Output is correct
50 Correct 104 ms 636 KB Output is correct
51 Correct 118 ms 632 KB Output is correct
52 Correct 116 ms 632 KB Output is correct
53 Correct 112 ms 632 KB Output is correct
54 Correct 117 ms 632 KB Output is correct

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Execution timed out 2072 ms 12904 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 2 ms 384 KB Output is correct
22 Correct 2 ms 384 KB Output is correct
23 Correct 2 ms 384 KB Output is correct
24 Correct 1 ms 384 KB Output is correct
25 Correct 2 ms 384 KB Output is correct
26 Correct 1 ms 384 KB Output is correct
27 Correct 2 ms 436 KB Output is correct
28 Correct 1 ms 384 KB Output is correct
29 Execution timed out 2072 ms 12904 KB Time limit exceeded
30 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 2 ms 384 KB Output is correct
22 Correct 2 ms 384 KB Output is correct
23 Correct 2 ms 384 KB Output is correct
24 Correct 1 ms 384 KB Output is correct
25 Correct 2 ms 384 KB Output is correct
26 Correct 1 ms 384 KB Output is correct
27 Correct 2 ms 436 KB Output is correct
28 Correct 1 ms 384 KB Output is correct
29 Correct 73 ms 544 KB Output is correct
30 Correct 95 ms 632 KB Output is correct
31 Correct 116 ms 624 KB Output is correct
32 Correct 107 ms 512 KB Output is correct
33 Correct 114 ms 512 KB Output is correct
34 Correct 108 ms 636 KB Output is correct
35 Correct 117 ms 632 KB Output is correct
36 Correct 71 ms 632 KB Output is correct
37 Correct 113 ms 632 KB Output is correct
38 Correct 132 ms 632 KB Output is correct
39 Correct 82 ms 640 KB Output is correct
40 Correct 98 ms 632 KB Output is correct
41 Correct 95 ms 632 KB Output is correct
42 Correct 94 ms 632 KB Output is correct
43 Correct 200 ms 632 KB Output is correct
44 Correct 199 ms 632 KB Output is correct
45 Correct 194 ms 636 KB Output is correct
46 Correct 178 ms 632 KB Output is correct
47 Correct 94 ms 632 KB Output is correct
48 Correct 97 ms 632 KB Output is correct
49 Correct 100 ms 632 KB Output is correct
50 Correct 104 ms 636 KB Output is correct
51 Correct 118 ms 632 KB Output is correct
52 Correct 116 ms 632 KB Output is correct
53 Correct 112 ms 632 KB Output is correct
54 Correct 117 ms 632 KB Output is correct
55 Execution timed out 2076 ms 12612 KB Time limit exceeded
56 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct
11 Correct 2 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 2 ms 384 KB Output is correct
15 Correct 2 ms 384 KB Output is correct
16 Correct 1 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 1 ms 384 KB Output is correct
19 Correct 2 ms 384 KB Output is correct
20 Correct 2 ms 384 KB Output is correct
21 Correct 2 ms 384 KB Output is correct
22 Correct 2 ms 384 KB Output is correct
23 Correct 2 ms 384 KB Output is correct
24 Correct 1 ms 384 KB Output is correct
25 Correct 2 ms 384 KB Output is correct
26 Correct 1 ms 384 KB Output is correct
27 Correct 2 ms 436 KB Output is correct
28 Correct 1 ms 384 KB Output is correct
29 Correct 73 ms 544 KB Output is correct
30 Correct 95 ms 632 KB Output is correct
31 Correct 116 ms 624 KB Output is correct
32 Correct 107 ms 512 KB Output is correct
33 Correct 114 ms 512 KB Output is correct
34 Correct 108 ms 636 KB Output is correct
35 Correct 117 ms 632 KB Output is correct
36 Correct 71 ms 632 KB Output is correct
37 Correct 113 ms 632 KB Output is correct
38 Correct 132 ms 632 KB Output is correct
39 Correct 82 ms 640 KB Output is correct
40 Correct 98 ms 632 KB Output is correct
41 Correct 95 ms 632 KB Output is correct
42 Correct 94 ms 632 KB Output is correct
43 Correct 200 ms 632 KB Output is correct
44 Correct 199 ms 632 KB Output is correct
45 Correct 194 ms 636 KB Output is correct
46 Correct 178 ms 632 KB Output is correct
47 Correct 94 ms 632 KB Output is correct
48 Correct 97 ms 632 KB Output is correct
49 Correct 100 ms 632 KB Output is correct
50 Correct 104 ms 636 KB Output is correct
51 Correct 118 ms 632 KB Output is correct
52 Correct 116 ms 632 KB Output is correct
53 Correct 112 ms 632 KB Output is correct
54 Correct 117 ms 632 KB Output is correct
55 Execution timed out 2072 ms 12904 KB Time limit exceeded
56 Halted 0 ms 0 KB -