oj.uz

Submission #1108866

# Submission time Handle Problem Language Result Execution time Memory
1108866 2024-11-05T12:19:04 Z AverageAmogusEnjoyer Joker (BOI20_joker) C++17
100 / 100
 1542 ms 19784 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
template<class T> bool cmin(T &i, T j) { return i > j ? i=j,true:false; }
template<class T> bool cmax(T &i, T j) { return i < j ? i=j,true:false; }

constexpr int nax = 200200,block_size = 450;
vector<tuple<int,int,int>> queries[block_size]; // r,l,idx
vector<bool> ans;
int edges[nax][2];
int n,m;

struct dsu_save {
    int x,y,lzx,lzy,szx,szy,parx,pary;
};

struct DSU {
    int lz[nax];
    int par[nax];
    int sz[nax];
    dsu_save stk[nax];
    int T = 0;
    DSU(int N) {
        for (int i = 0; i < N; i++)
            lz[i] = 0, par[i] = i, sz[i] = 1;
    }
    int get(int x,int &cx) {
        cx ^= lz[x];
        return (x == par[x] ? x : get(par[x],cx));
    }
    bool need_reset = 0;
    bool unite(int x,int y) {
        assert(!need_reset);

        // cout << "Adding edge: " << x + 1 << " " << y + 1 << endl;

        int cx = 0,cy = 0;
        int px = get(x,cx), py = get(y,cy);

        // cout << px + 1 << " " << py + 1 << " " << cx << " " << cy << endl;
        if (sz[px] < sz[py]) 
            swap(px,py);
        stk[T++] = {px,py,lz[px],lz[py],sz[px],sz[py],par[px],par[py]};
        if (cx == cy) {
            if (px == py) {
                need_reset = 1;
                return 1;
            } else {
                lz[py] ^= 1;
                sz[px] += sz[py];
                par[py] = px;
            }
        } else {
            if (px != py) {
                sz[px] += sz[py];
                par[py] = px;
            }
        }
        return 0;
    }
    void rollback(int k) {
        need_reset = 0;
        // do stuff
        assert(T >= k);
        while(k--) {
            auto &c = stk[--T];
            lz[c.x] = c.lzx,lz[c.y] = c.lzy,par[c.x] = c.parx,par[c.y] = c.pary,sz[c.x] = c.szx,sz[c.y] = c.szy;
        }
    }
};

DSU dsu(nax); 

bool solve_block(int block) {
    int current_r = m - 1;
    for (int i = max(0,(block - 1) * block_size); i < min(m,block * block_size); i++) {
        // cout << "edge index: " << i + 1 << endl;
        if (dsu.unite(edges[i][0],edges[i][1])) {
            for (int B = block; B < block_size; B++) 
                for (auto &[r,l,idx]: queries[B])
                    ans[idx] = 1;
            return 1;
        }
    }
    for (int i = 0; i < queries[block].size(); i++) {
        auto &[r,l,idx] = queries[block][i];
        while(current_r >= r) {
            // cout << "edge index: " << current_r + 1 << endl;
            if (dsu.unite(edges[current_r][0],edges[current_r][1])) {
                for (int j = i; j < queries[block].size(); j++) {
                    int idx2 = get<2>(queries[block][j]);
                    ans[idx2] = 1;
                }
                dsu.rollback(m - current_r); // potrebbero essere necessari dei +- 1
                return 0;
            }
            current_r--;
        }
        --l;
        int inserted = 0;
        while(l >= block * block_size) {
            // devo inserirlo
            inserted++;
            // cout << "edge index: " << l + 1 << endl;
            if (dsu.unite(edges[l][0],edges[l][1])) {
                ans[idx] = 1;
                break;
            }
            l--;
        }
        dsu.rollback(inserted);
    }
    dsu.rollback(m - current_r - 1);
    return 0;
}

vector<bool> trova_cicli(int N, int M, int Q, vector<int> A, vector<int> B, vector<int> L, vector<int> R) {
    n = N, m = M;
    for (int i = 0; i < M; i++)
        edges[i][0] = A[i],edges[i][1] = B[i];
    ans.resize(Q);
    for (int i = 0; i < Q; i++) 
        queries[L[i] / block_size].emplace_back(R[i],L[i],i);
    for (int i = 0; i < block_size; i++) 
        sort(queries[i].rbegin(),queries[i].rend());
    for (int i = 0; i < block_size; i++) 
        if (solve_block(i))
            break;
    return ans;
}

int main() {

    int N,M,Q;
    cin >> N >> M >> Q;
    vector<int> A(M),B(M),L(Q),R(Q);
    for (int i = 0; i < M; i++) {
        cin >> A[i] >> B[i];
        --A[i],--B[i];
    }
    for (int i = 0; i < Q; i++) {
        cin >> L[i] >> R[i];
        --L[i];
    }
    auto res = trova_cicli(N,M,Q,A,B,L,R);
    for (int i = 0; i < Q; i++) 
        cout << (res[i] ? "YES" : "NO") << "\n";

}

Compilation message

Joker.cpp: In function 'bool solve_block(int)':
Joker.cpp:86:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::tuple<int, int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   86 |     for (int i = 0; i < queries[block].size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~~~~~~~~~
Joker.cpp:91:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::tuple<int, int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |                 for (int j = i; j < queries[block].size(); j++) {
      |                                 ~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4688 KB Output is correct
2 Correct 2 ms 4688 KB Output is correct
3 Correct 1 ms 4688 KB Output is correct
4 Correct 2 ms 4688 KB Output is correct
5 Correct 1 ms 4688 KB Output is correct
6 Correct 2 ms 4688 KB Output is correct
7 Correct 2 ms 4740 KB Output is correct
8 Correct 3 ms 4688 KB Output is correct
9 Correct 2 ms 4688 KB Output is correct
10 Correct 2 ms 4688 KB Output is correct
11 Correct 2 ms 4688 KB Output is correct
12 Correct 2 ms 4736 KB Output is correct
13 Correct 2 ms 4688 KB Output is correct
14 Correct 1 ms 4688 KB Output is correct
15 Correct 2 ms 4856 KB Output is correct
16 Correct 2 ms 4944 KB Output is correct
17 Correct 2 ms 4688 KB Output is correct
18 Correct 2 ms 4700 KB Output is correct
19 Correct 2 ms 4688 KB Output is correct
20 Correct 1 ms 4688 KB Output is correct
21 Correct 2 ms 4688 KB Output is correct
22 Correct 2 ms 4688 KB Output is correct
23 Correct 2 ms 4688 KB Output is correct
24 Correct 1 ms 4688 KB Output is correct
25 Correct 2 ms 4688 KB Output is correct
26 Correct 2 ms 4688 KB Output is correct
27 Correct 2 ms 4856 KB Output is correct
28 Correct 2 ms 4940 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4688 KB Output is correct
2 Correct 2 ms 4688 KB Output is correct
3 Correct 1 ms 4688 KB Output is correct
4 Correct 2 ms 4688 KB Output is correct
5 Correct 1 ms 4688 KB Output is correct
6 Correct 2 ms 4688 KB Output is correct
7 Correct 2 ms 4740 KB Output is correct
8 Correct 3 ms 4688 KB Output is correct
9 Correct 2 ms 4688 KB Output is correct
10 Correct 2 ms 4688 KB Output is correct
11 Correct 2 ms 4688 KB Output is correct
12 Correct 2 ms 4736 KB Output is correct
13 Correct 2 ms 4688 KB Output is correct
14 Correct 1 ms 4688 KB Output is correct
15 Correct 2 ms 4856 KB Output is correct
16 Correct 2 ms 4944 KB Output is correct
17 Correct 2 ms 4688 KB Output is correct
18 Correct 2 ms 4700 KB Output is correct
19 Correct 2 ms 4688 KB Output is correct
20 Correct 1 ms 4688 KB Output is correct
21 Correct 2 ms 4688 KB Output is correct
22 Correct 2 ms 4688 KB Output is correct
23 Correct 2 ms 4688 KB Output is correct
24 Correct 1 ms 4688 KB Output is correct
25 Correct 2 ms 4688 KB Output is correct
26 Correct 2 ms 4688 KB Output is correct
27 Correct 2 ms 4856 KB Output is correct
28 Correct 2 ms 4940 KB Output is correct
29 Correct 7 ms 4688 KB Output is correct
30 Correct 5 ms 4688 KB Output is correct
31 Correct 5 ms 4688 KB Output is correct
32 Correct 4 ms 4688 KB Output is correct
33 Correct 4 ms 4688 KB Output is correct
34 Correct 5 ms 4688 KB Output is correct
35 Correct 5 ms 4688 KB Output is correct
36 Correct 4 ms 4688 KB Output is correct
37 Correct 6 ms 4688 KB Output is correct
38 Correct 7 ms 4688 KB Output is correct
39 Correct 6 ms 4688 KB Output is correct
40 Correct 4 ms 4700 KB Output is correct
41 Correct 5 ms 4688 KB Output is correct
42 Correct 5 ms 4688 KB Output is correct
43 Correct 3 ms 4688 KB Output is correct
44 Correct 3 ms 4864 KB Output is correct
45 Correct 3 ms 4688 KB Output is correct
46 Correct 4 ms 4688 KB Output is correct
47 Correct 4 ms 4688 KB Output is correct
48 Correct 5 ms 4688 KB Output is correct
49 Correct 4 ms 4688 KB Output is correct
50 Correct 5 ms 4688 KB Output is correct
51 Correct 5 ms 4688 KB Output is correct
52 Correct 5 ms 4688 KB Output is correct
53 Correct 5 ms 4688 KB Output is correct
54 Correct 6 ms 4688 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4688 KB Output is correct
2 Correct 2 ms 4688 KB Output is correct
3 Correct 153 ms 17092 KB Output is correct
4 Correct 152 ms 19240 KB Output is correct
5 Correct 167 ms 19128 KB Output is correct
6 Correct 174 ms 17076 KB Output is correct
7 Correct 159 ms 17088 KB Output is correct
8 Correct 155 ms 17080 KB Output is correct
9 Correct 149 ms 17088 KB Output is correct
10 Correct 159 ms 16936 KB Output is correct
11 Correct 165 ms 17080 KB Output is correct
12 Correct 167 ms 17080 KB Output is correct
13 Correct 176 ms 16944 KB Output is correct
14 Correct 156 ms 17080 KB Output is correct
15 Correct 153 ms 17080 KB Output is correct
16 Correct 151 ms 17080 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4688 KB Output is correct
2 Correct 2 ms 4688 KB Output is correct
3 Correct 1 ms 4688 KB Output is correct
4 Correct 2 ms 4688 KB Output is correct
5 Correct 1 ms 4688 KB Output is correct
6 Correct 2 ms 4688 KB Output is correct
7 Correct 2 ms 4740 KB Output is correct
8 Correct 3 ms 4688 KB Output is correct
9 Correct 2 ms 4688 KB Output is correct
10 Correct 2 ms 4688 KB Output is correct
11 Correct 2 ms 4688 KB Output is correct
12 Correct 2 ms 4736 KB Output is correct
13 Correct 2 ms 4688 KB Output is correct
14 Correct 1 ms 4688 KB Output is correct
15 Correct 2 ms 4856 KB Output is correct
16 Correct 2 ms 4944 KB Output is correct
17 Correct 2 ms 4688 KB Output is correct
18 Correct 2 ms 4700 KB Output is correct
19 Correct 2 ms 4688 KB Output is correct
20 Correct 1 ms 4688 KB Output is correct
21 Correct 2 ms 4688 KB Output is correct
22 Correct 2 ms 4688 KB Output is correct
23 Correct 2 ms 4688 KB Output is correct
24 Correct 1 ms 4688 KB Output is correct
25 Correct 2 ms 4688 KB Output is correct
26 Correct 2 ms 4688 KB Output is correct
27 Correct 2 ms 4856 KB Output is correct
28 Correct 2 ms 4940 KB Output is correct
29 Correct 153 ms 17092 KB Output is correct
30 Correct 152 ms 19240 KB Output is correct
31 Correct 167 ms 19128 KB Output is correct
32 Correct 174 ms 17076 KB Output is correct
33 Correct 159 ms 17088 KB Output is correct
34 Correct 155 ms 17080 KB Output is correct
35 Correct 149 ms 17088 KB Output is correct
36 Correct 159 ms 16936 KB Output is correct
37 Correct 165 ms 17080 KB Output is correct
38 Correct 167 ms 17080 KB Output is correct
39 Correct 176 ms 16944 KB Output is correct
40 Correct 156 ms 17080 KB Output is correct
41 Correct 153 ms 17080 KB Output is correct
42 Correct 151 ms 17080 KB Output is correct
43 Correct 337 ms 17076 KB Output is correct
44 Correct 361 ms 19164 KB Output is correct
45 Correct 365 ms 19380 KB Output is correct
46 Correct 311 ms 17076 KB Output is correct
47 Correct 317 ms 16936 KB Output is correct
48 Correct 169 ms 17076 KB Output is correct
49 Correct 196 ms 16936 KB Output is correct
50 Correct 335 ms 16932 KB Output is correct
51 Correct 374 ms 17076 KB Output is correct
52 Correct 355 ms 17076 KB Output is correct
53 Correct 349 ms 17112 KB Output is correct
54 Correct 386 ms 17332 KB Output is correct
55 Correct 385 ms 16944 KB Output is correct
56 Correct 400 ms 17120 KB Output is correct

Subtask #5
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4688 KB Output is correct
2 Correct 2 ms 4688 KB Output is correct
3 Correct 1 ms 4688 KB Output is correct
4 Correct 2 ms 4688 KB Output is correct
5 Correct 1 ms 4688 KB Output is correct
6 Correct 2 ms 4688 KB Output is correct
7 Correct 2 ms 4740 KB Output is correct
8 Correct 3 ms 4688 KB Output is correct
9 Correct 2 ms 4688 KB Output is correct
10 Correct 2 ms 4688 KB Output is correct
11 Correct 2 ms 4688 KB Output is correct
12 Correct 2 ms 4736 KB Output is correct
13 Correct 2 ms 4688 KB Output is correct
14 Correct 1 ms 4688 KB Output is correct
15 Correct 2 ms 4856 KB Output is correct
16 Correct 2 ms 4944 KB Output is correct
17 Correct 2 ms 4688 KB Output is correct
18 Correct 2 ms 4700 KB Output is correct
19 Correct 2 ms 4688 KB Output is correct
20 Correct 1 ms 4688 KB Output is correct
21 Correct 2 ms 4688 KB Output is correct
22 Correct 2 ms 4688 KB Output is correct
23 Correct 2 ms 4688 KB Output is correct
24 Correct 1 ms 4688 KB Output is correct
25 Correct 2 ms 4688 KB Output is correct
26 Correct 2 ms 4688 KB Output is correct
27 Correct 2 ms 4856 KB Output is correct
28 Correct 2 ms 4940 KB Output is correct
29 Correct 7 ms 4688 KB Output is correct
30 Correct 5 ms 4688 KB Output is correct
31 Correct 5 ms 4688 KB Output is correct
32 Correct 4 ms 4688 KB Output is correct
33 Correct 4 ms 4688 KB Output is correct
34 Correct 5 ms 4688 KB Output is correct
35 Correct 5 ms 4688 KB Output is correct
36 Correct 4 ms 4688 KB Output is correct
37 Correct 6 ms 4688 KB Output is correct
38 Correct 7 ms 4688 KB Output is correct
39 Correct 6 ms 4688 KB Output is correct
40 Correct 4 ms 4700 KB Output is correct
41 Correct 5 ms 4688 KB Output is correct
42 Correct 5 ms 4688 KB Output is correct
43 Correct 3 ms 4688 KB Output is correct
44 Correct 3 ms 4864 KB Output is correct
45 Correct 3 ms 4688 KB Output is correct
46 Correct 4 ms 4688 KB Output is correct
47 Correct 4 ms 4688 KB Output is correct
48 Correct 5 ms 4688 KB Output is correct
49 Correct 4 ms 4688 KB Output is correct
50 Correct 5 ms 4688 KB Output is correct
51 Correct 5 ms 4688 KB Output is correct
52 Correct 5 ms 4688 KB Output is correct
53 Correct 5 ms 4688 KB Output is correct
54 Correct 6 ms 4688 KB Output is correct
55 Correct 296 ms 11336 KB Output is correct
56 Correct 1169 ms 13732 KB Output is correct
57 Correct 85 ms 13384 KB Output is correct
58 Correct 75 ms 11444 KB Output is correct
59 Correct 165 ms 11336 KB Output is correct
60 Correct 311 ms 11432 KB Output is correct
61 Correct 194 ms 11336 KB Output is correct
62 Correct 345 ms 11592 KB Output is correct
63 Correct 92 ms 11436 KB Output is correct
64 Correct 198 ms 11428 KB Output is correct
65 Correct 352 ms 11336 KB Output is correct

Subtask #6
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4688 KB Output is correct
2 Correct 2 ms 4688 KB Output is correct
3 Correct 1 ms 4688 KB Output is correct
4 Correct 2 ms 4688 KB Output is correct
5 Correct 1 ms 4688 KB Output is correct
6 Correct 2 ms 4688 KB Output is correct
7 Correct 2 ms 4740 KB Output is correct
8 Correct 3 ms 4688 KB Output is correct
9 Correct 2 ms 4688 KB Output is correct
10 Correct 2 ms 4688 KB Output is correct
11 Correct 2 ms 4688 KB Output is correct
12 Correct 2 ms 4736 KB Output is correct
13 Correct 2 ms 4688 KB Output is correct
14 Correct 1 ms 4688 KB Output is correct
15 Correct 2 ms 4856 KB Output is correct
16 Correct 2 ms 4944 KB Output is correct
17 Correct 2 ms 4688 KB Output is correct
18 Correct 2 ms 4700 KB Output is correct
19 Correct 2 ms 4688 KB Output is correct
20 Correct 1 ms 4688 KB Output is correct
21 Correct 2 ms 4688 KB Output is correct
22 Correct 2 ms 4688 KB Output is correct
23 Correct 2 ms 4688 KB Output is correct
24 Correct 1 ms 4688 KB Output is correct
25 Correct 2 ms 4688 KB Output is correct
26 Correct 2 ms 4688 KB Output is correct
27 Correct 2 ms 4856 KB Output is correct
28 Correct 2 ms 4940 KB Output is correct
29 Correct 7 ms 4688 KB Output is correct
30 Correct 5 ms 4688 KB Output is correct
31 Correct 5 ms 4688 KB Output is correct
32 Correct 4 ms 4688 KB Output is correct
33 Correct 4 ms 4688 KB Output is correct
34 Correct 5 ms 4688 KB Output is correct
35 Correct 5 ms 4688 KB Output is correct
36 Correct 4 ms 4688 KB Output is correct
37 Correct 6 ms 4688 KB Output is correct
38 Correct 7 ms 4688 KB Output is correct
39 Correct 6 ms 4688 KB Output is correct
40 Correct 4 ms 4700 KB Output is correct
41 Correct 5 ms 4688 KB Output is correct
42 Correct 5 ms 4688 KB Output is correct
43 Correct 3 ms 4688 KB Output is correct
44 Correct 3 ms 4864 KB Output is correct
45 Correct 3 ms 4688 KB Output is correct
46 Correct 4 ms 4688 KB Output is correct
47 Correct 4 ms 4688 KB Output is correct
48 Correct 5 ms 4688 KB Output is correct
49 Correct 4 ms 4688 KB Output is correct
50 Correct 5 ms 4688 KB Output is correct
51 Correct 5 ms 4688 KB Output is correct
52 Correct 5 ms 4688 KB Output is correct
53 Correct 5 ms 4688 KB Output is correct
54 Correct 6 ms 4688 KB Output is correct
55 Correct 153 ms 17092 KB Output is correct
56 Correct 152 ms 19240 KB Output is correct
57 Correct 167 ms 19128 KB Output is correct
58 Correct 174 ms 17076 KB Output is correct
59 Correct 159 ms 17088 KB Output is correct
60 Correct 155 ms 17080 KB Output is correct
61 Correct 149 ms 17088 KB Output is correct
62 Correct 159 ms 16936 KB Output is correct
63 Correct 165 ms 17080 KB Output is correct
64 Correct 167 ms 17080 KB Output is correct
65 Correct 176 ms 16944 KB Output is correct
66 Correct 156 ms 17080 KB Output is correct
67 Correct 153 ms 17080 KB Output is correct
68 Correct 151 ms 17080 KB Output is correct
69 Correct 337 ms 17076 KB Output is correct
70 Correct 361 ms 19164 KB Output is correct
71 Correct 365 ms 19380 KB Output is correct
72 Correct 311 ms 17076 KB Output is correct
73 Correct 317 ms 16936 KB Output is correct
74 Correct 169 ms 17076 KB Output is correct
75 Correct 196 ms 16936 KB Output is correct
76 Correct 335 ms 16932 KB Output is correct
77 Correct 374 ms 17076 KB Output is correct
78 Correct 355 ms 17076 KB Output is correct
79 Correct 349 ms 17112 KB Output is correct
80 Correct 386 ms 17332 KB Output is correct
81 Correct 385 ms 16944 KB Output is correct
82 Correct 400 ms 17120 KB Output is correct
83 Correct 296 ms 11336 KB Output is correct
84 Correct 1169 ms 13732 KB Output is correct
85 Correct 85 ms 13384 KB Output is correct
86 Correct 75 ms 11444 KB Output is correct
87 Correct 165 ms 11336 KB Output is correct
88 Correct 311 ms 11432 KB Output is correct
89 Correct 194 ms 11336 KB Output is correct
90 Correct 345 ms 11592 KB Output is correct
91 Correct 92 ms 11436 KB Output is correct
92 Correct 198 ms 11428 KB Output is correct
93 Correct 352 ms 11336 KB Output is correct
94 Correct 587 ms 17620 KB Output is correct
95 Correct 1542 ms 19784 KB Output is correct
96 Correct 517 ms 19644 KB Output is correct
97 Correct 354 ms 17700 KB Output is correct
98 Correct 397 ms 17480 KB Output is correct
99 Correct 204 ms 17480 KB Output is correct
100 Correct 308 ms 17592 KB Output is correct
101 Correct 437 ms 17644 KB Output is correct
102 Correct 592 ms 17592 KB Output is correct
103 Correct 789 ms 17656 KB Output is correct
104 Correct 391 ms 17480 KB Output is correct
105 Correct 560 ms 17480 KB Output is correct
106 Correct 784 ms 17480 KB Output is correct
107 Correct 542 ms 19384 KB Output is correct
108 Correct 787 ms 17736 KB Output is correct
109 Correct 817 ms 17480 KB Output is correct
110 Correct 841 ms 17480 KB Output is correct
111 Correct 831 ms 17484 KB Output is correct
112 Correct 878 ms 17644 KB Output is correct
113 Correct 858 ms 17480 KB Output is correct
114 Correct 839 ms 17592 KB Output is correct
115 Correct 826 ms 17592 KB Output is correct
116 Correct 814 ms 17584 KB Output is correct