oj.uz

Submission #541765

# Submission time Handle Problem Language Result Execution time Memory
541765 2022-03-24T10:41:42 Z alextodoran Parachute rings (IOI12_rings) C++17
100 / 100
 2519 ms 119312 KB 
/**
 ____ ____ ____ ____ ____
||a |||t |||o |||d |||o ||
||__|||__|||__|||__|||__||
|/__\|/__\|/__\|/__\|/__\|

**/

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int CHAINS = 1;
const int CYCLE = 2;
const int RANDOM = 3;
const int QUIT = 4;

struct DSU {
    vector <int> root;
    vector <int> dim;
    int ignore;
    int cycleLength;
    int findRoot (int u) {
        return (root[u] == u ? u : root[u] = findRoot(root[u]));
    }
    bool join (int u, int v) {
        if (u == ignore || v == ignore) {
            return false;
        }
        u = findRoot(u);
        v = findRoot(v);
        if (u != v) {
            root[u] = v;
            dim[v] += dim[u];
            return false;
        } else {
            cycleLength = dim[u];
            return true;
        }
    }
    DSU (int N, int _ignore = -1) {
        root.resize(N);
        dim.resize(N);
        iota(root.begin(), root.end(), 0);
        fill(dim.begin(), dim.end(), 1);
        ignore = _ignore;
        cycleLength = 0;
    }
    DSU () {}
};

int N;

vector <vector <int>> adj;

DSU graph;
vector <pair <int, DSU>> options;
int phase;

int cntBlack;
vector <int> adjBlack;
bool red;

vector <pair <int, int>> links;

void Init (int _N) {
    N = _N;
    adj.resize(N);
    adjBlack.resize(N);
    phase = CHAINS;
    graph = DSU(N);
}
int CountCritical () {
    if (phase == QUIT) {
        return 0;
    } else if (phase == CHAINS) {
        return N;
    } else if (phase == CYCLE) {
        return graph.cycleLength;
    } else if (phase == RANDOM) {
        int answer = 0;
        for (pair <int, DSU> &opt : options) {
            if (red == true && (int) adj[opt.first].size() <= 3) {
                continue;
            }
            if (adjBlack[opt.first] < cntBlack) {
                continue;
            }
            if (opt.second.cycleLength > 0) {
                continue;
            }
            answer++;
        }
        return answer;
    }
}
void Link (int u, int v) {
    adj[u].push_back(v);
    adj[v].push_back(u);
    if ((int) adj[v].size() >= 3) {
        swap(u, v);
    }
    if (phase < RANDOM && (int) adj[u].size() >= 3) {
        phase = RANDOM;
        options.push_back(make_pair(u, DSU()));
        for (int v : adj[u]) {
            options.push_back(make_pair(v, DSU()));
        }
        for (pair <int, DSU> &opt : options) {
            opt.second = DSU(N, opt.first);
            for (pair <int, int> l : links) {
                opt.second.join(l.first, l.second);
            }
        }
    }
    links.push_back(make_pair(u, v));
    if (phase == CHAINS) {
        if (graph.join(u, v) == true) {
            phase = CYCLE;
        }
    } else if (phase == CYCLE) {
        if (graph.join(u, v) == true) {
            phase = QUIT;
        }
    } else {
        graph.join(u, v);
        for (pair <int, DSU> &opt : options) {
            opt.second.join(u, v);
        }
        if ((int) adj[u].size() == 3) {
            cntBlack++;
            adjBlack[u]++;
            for (int x : adj[u]) {
                adjBlack[x]++;
            }
        }
        if ((int) adj[v].size() == 3) {
            cntBlack++;
            adjBlack[v]++;
            for (int x : adj[v]) {
                adjBlack[x]++;
            }
        }
        if ((int) adj[u].size() == 4 || (int) adj[v].size() == 4) {
            if (red == true) {
                phase = QUIT;
            } else {
                red = true;
            }
        }
    }
}

Compilation message

rings.cpp: In function 'int CountCritical()':
rings.cpp:98:1: warning: control reaches end of non-void function [-Wreturn-type]
   98 | }
      | ^
rings.cpp: In function 'void Link(int, int)':
rings.cpp:20:8: warning: '*((void*)&<anonymous> +48)' may be used uninitialized in this function [-Wmaybe-uninitialized]
   20 | struct DSU {
      |        ^~~
rings.cpp:20:8: warning: '*((void*)&<anonymous> +48)' may be used uninitialized in this function [-Wmaybe-uninitialized]
   20 | struct DSU {
      |        ^~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 2 ms 728 KB Output is correct
3 Correct 3 ms 852 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 2 ms 724 KB Output is correct
7 Correct 1 ms 596 KB Output is correct
8 Correct 2 ms 592 KB Output is correct
9 Correct 3 ms 852 KB Output is correct
10 Correct 3 ms 852 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 358 ms 45876 KB Output is correct
2 Correct 1307 ms 95484 KB Output is correct
3 Correct 2519 ms 114180 KB Output is correct
4 Correct 1034 ms 87980 KB Output is correct
5 Correct 961 ms 88016 KB Output is correct
6 Correct 983 ms 86136 KB Output is correct
7 Correct 2311 ms 112772 KB Output is correct
8 Correct 1369 ms 111688 KB Output is correct
9 Correct 1449 ms 119312 KB Output is correct
10 Correct 662 ms 85556 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 2 ms 728 KB Output is correct
3 Correct 3 ms 852 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 2 ms 724 KB Output is correct
7 Correct 1 ms 596 KB Output is correct
8 Correct 2 ms 592 KB Output is correct
9 Correct 3 ms 852 KB Output is correct
10 Correct 3 ms 852 KB Output is correct
11 Correct 3 ms 852 KB Output is correct
12 Correct 5 ms 1420 KB Output is correct
13 Correct 5 ms 1492 KB Output is correct
14 Correct 4 ms 1236 KB Output is correct
15 Correct 4 ms 1876 KB Output is correct
16 Correct 4 ms 1108 KB Output is correct
17 Correct 5 ms 1492 KB Output is correct
18 Correct 7 ms 2292 KB Output is correct
19 Correct 4 ms 1236 KB Output is correct
20 Correct 5 ms 1492 KB Output is correct

Subtask #4
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 2 ms 728 KB Output is correct
3 Correct 3 ms 852 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 2 ms 724 KB Output is correct
7 Correct 1 ms 596 KB Output is correct
8 Correct 2 ms 592 KB Output is correct
9 Correct 3 ms 852 KB Output is correct
10 Correct 3 ms 852 KB Output is correct
11 Correct 3 ms 852 KB Output is correct
12 Correct 5 ms 1420 KB Output is correct
13 Correct 5 ms 1492 KB Output is correct
14 Correct 4 ms 1236 KB Output is correct
15 Correct 4 ms 1876 KB Output is correct
16 Correct 4 ms 1108 KB Output is correct
17 Correct 5 ms 1492 KB Output is correct
18 Correct 7 ms 2292 KB Output is correct
19 Correct 4 ms 1236 KB Output is correct
20 Correct 5 ms 1492 KB Output is correct
21 Correct 15 ms 3664 KB Output is correct
22 Correct 24 ms 5620 KB Output is correct
23 Correct 32 ms 7076 KB Output is correct
24 Correct 80 ms 9212 KB Output is correct
25 Correct 19 ms 7508 KB Output is correct
26 Correct 56 ms 10192 KB Output is correct
27 Correct 40 ms 7648 KB Output is correct
28 Correct 57 ms 10684 KB Output is correct
29 Correct 47 ms 9312 KB Output is correct
30 Correct 65 ms 8700 KB Output is correct

Subtask #5
31.0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 2 ms 728 KB Output is correct
3 Correct 3 ms 852 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 2 ms 724 KB Output is correct
7 Correct 1 ms 596 KB Output is correct
8 Correct 2 ms 592 KB Output is correct
9 Correct 3 ms 852 KB Output is correct
10 Correct 3 ms 852 KB Output is correct
11 Correct 358 ms 45876 KB Output is correct
12 Correct 1307 ms 95484 KB Output is correct
13 Correct 2519 ms 114180 KB Output is correct
14 Correct 1034 ms 87980 KB Output is correct
15 Correct 961 ms 88016 KB Output is correct
16 Correct 983 ms 86136 KB Output is correct
17 Correct 2311 ms 112772 KB Output is correct
18 Correct 1369 ms 111688 KB Output is correct
19 Correct 1449 ms 119312 KB Output is correct
20 Correct 662 ms 85556 KB Output is correct
21 Correct 3 ms 852 KB Output is correct
22 Correct 5 ms 1420 KB Output is correct
23 Correct 5 ms 1492 KB Output is correct
24 Correct 4 ms 1236 KB Output is correct
25 Correct 4 ms 1876 KB Output is correct
26 Correct 4 ms 1108 KB Output is correct
27 Correct 5 ms 1492 KB Output is correct
28 Correct 7 ms 2292 KB Output is correct
29 Correct 4 ms 1236 KB Output is correct
30 Correct 5 ms 1492 KB Output is correct
31 Correct 15 ms 3664 KB Output is correct
32 Correct 24 ms 5620 KB Output is correct
33 Correct 32 ms 7076 KB Output is correct
34 Correct 80 ms 9212 KB Output is correct
35 Correct 19 ms 7508 KB Output is correct
36 Correct 56 ms 10192 KB Output is correct
37 Correct 40 ms 7648 KB Output is correct
38 Correct 57 ms 10684 KB Output is correct
39 Correct 47 ms 9312 KB Output is correct
40 Correct 65 ms 8700 KB Output is correct
41 Correct 197 ms 31536 KB Output is correct
42 Correct 499 ms 82272 KB Output is correct
43 Correct 320 ms 69340 KB Output is correct
44 Correct 1006 ms 108800 KB Output is correct
45 Correct 1568 ms 102108 KB Output is correct
46 Correct 601 ms 73644 KB Output is correct
47 Correct 850 ms 74728 KB Output is correct
48 Correct 691 ms 92304 KB Output is correct
49 Correct 567 ms 77092 KB Output is correct
50 Correct 666 ms 76060 KB Output is correct
51 Correct 360 ms 62784 KB Output is correct
52 Correct 897 ms 88148 KB Output is correct
53 Correct 722 ms 92744 KB Output is correct
54 Correct 1290 ms 96992 KB Output is correct
55 Correct 1628 ms 105464 KB Output is correct