oj.uz

Submission #172295

# Submission time Handle Problem Language Result Execution time Memory
172295 2020-01-01T00:09:52 Z qkxwsm Simurgh (IOI17_simurgh) C++14
51 / 100
 197 ms 4088 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include "simurgh.h"

using namespace std;
using namespace __gnu_pbds;

template<class T, class U>
void ckmin(T &a, U b)
{
    if (a > b) a = b;
}

template<class T, class U>
void ckmax(T &a, U b)
{
    if (a < b) a = b;
}

struct custom_hash
{
    template<class T>
    T operator()(T a) const
    {
        return (a ^ (a >> 15)) ^ (a * 69);
    }
};

template<class T, class U>
using hash_table = gp_hash_table<T, U, custom_hash>;

#define MP make_pair
#define PB push_back
#define LB lower_bound
#define UB upper_bound
#define fi first
#define se second
#define SZ(x) ((int) (x).size())
#define ALL(x) (x).begin(), (x).end()
#define FOR(i, a, b) for (auto i = (a); i < (b); i++)
#define FORD(i, a, b) for (auto i = (a) - 1; i >= (b); i--)
#define MAXN 513

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vpi;
typedef vector<pll> vpl;

int N, M, T;
int eid[MAXN][MAXN];
int st[MAXN], ft[MAXN];
hash_table<int, int> rec[MAXN];
vi edge[MAXN];
bitset<MAXN> seen;
int parent[MAXN], depth[MAXN];
int ans[MAXN * MAXN];
vi quer;
vi ret;

int get(int a, int b)
{
    if (rec[a].find(b) != rec[a].end()) return rec[a][b];
    quer.clear();
    if (a == 0 && b == 0)
    {
        FOR(i, 1, N)
        {
            quer.PB(eid[i][parent[i]]);
        }
        rec[a][b] = count_common_roads(quer);
    }
    else
    {
        FOR(i, 1, N)
        {
            if (i == a) continue;
            quer.PB(eid[i][parent[i]]);
        }
        quer.PB(b);
        rec[a][b] = count_common_roads(quer);
    }
    return rec[a][b];
    //take the tree, except delete a and add edge b.
}

void dfs(int u, int p)
{
    st[u] = T; ft[u] = T;
    T++;
    seen[u] = true;
    for (int v : edge[u])
    {
        if (v == p) continue;
        if (seen[v])
        {
            ckmin(ft[u], st[v]);
            continue;
        }
        parent[v] = u;
        depth[v] = depth[u] + 1;
        dfs(v, u);
        ckmin(ft[u], ft[v]);
    }
}

vi find_roads(int n, vi e1, vi e2)
{
    N = n; M = SZ(e1);
    FOR(i, 0, M)
    {
        edge[e1[i]].PB(e2[i]);
        edge[e2[i]].PB(e1[i]);
        eid[e1[i]][e2[i]] = i;
        eid[e2[i]][e1[i]] = i;
        ans[i] = -1;
    }
    parent[0] = N; parent[N] = N;
    dfs(0, N);
    // FOR(i, 1, N)
    // {
    //     cerr << i << " -> " << parent[i] << endl;
    // }
    //1 = yes, -1 = no, 0 = idk
    FOR(ed, 0, M)
    {
        int u = e1[ed], v = e2[ed];
        if (depth[u] > depth[v]) swap(u, v);
        if (u == parent[v]) continue;
        //lol there are no side edges.
        vi nodes; nodes.PB(v);
        while(nodes.back() != u)
        {
            nodes.PB(parent[nodes.back()]);
        }
        assert(nodes.back() == u);
        //you know the answer?
        int s = -1;
        FOR(i, 0, SZ(nodes) - 1)
        {
            if (ans[eid[nodes[i]][nodes[i + 1]]] != -1)
            {
                s = nodes[i];
                break;
            }
        }
        if (s == -1)
        {
            int mn = get(0, 0), mx = mn;
            FOR(i, 0, SZ(nodes) - 1)
            {
                int x = get(nodes[i], ed);
                ckmin(mn, x);
                ckmax(mx, x);
            }
            FOR(i, 0, SZ(nodes) - 1)
            {
                int x = get(nodes[i], ed);
                ans[eid[nodes[i]][nodes[i + 1]]] = ((mn == mx || x == mx) ? 0 : 1);
            }
            int x = get(0, 0);
            ans[ed] = ((mn == mx || x == mx) ? 0 : 1);
        }
        else
        {
            int x = get(s, ed);
            int y = get(0, 0);
            //y + ed - s = x -> ed = x + s - y
            ans[ed] = x + ans[eid[s][parent[s]]] - y;
            FOR(i, 0, SZ(nodes) - 1)
            {
                int ed1 = eid[nodes[i]][nodes[i + 1]];
                if (ans[ed1] != -1) continue;
                x = get(nodes[i], ed);
                //x = y + ed - ed1
                ans[ed1] = y - x + ans[ed];
            }
        }
    }
    FOR(u, 1, N)
    {
        if (ans[eid[u][parent[u]]] == -1)
        {
            ans[eid[u][parent[u]]] = 1;
        }
    }
    FOR(i, 0, M)
    {
        assert(ans[i] == 0 || ans[i] == 1);
        if (ans[i] == 1) ret.PB(i);
    }
    // cerr << "RETURNS:";
    // for (int x : ret)
    // {
    //     cerr << ' ' << x;
    // }
    // cerr << endl;
    return ret;
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 504 KB correct
2 Correct 2 ms 504 KB correct
3 Correct 2 ms 504 KB correct
4 Correct 2 ms 504 KB correct
5 Correct 2 ms 504 KB correct
6 Correct 2 ms 504 KB correct
7 Correct 2 ms 376 KB correct
8 Correct 2 ms 504 KB correct
9 Correct 2 ms 504 KB correct
10 Correct 2 ms 504 KB correct
11 Correct 2 ms 504 KB correct
12 Correct 2 ms 504 KB correct
13 Correct 2 ms 508 KB correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 504 KB correct
2 Correct 2 ms 504 KB correct
3 Correct 2 ms 504 KB correct
4 Correct 2 ms 504 KB correct
5 Correct 2 ms 504 KB correct
6 Correct 2 ms 504 KB correct
7 Correct 2 ms 376 KB correct
8 Correct 2 ms 504 KB correct
9 Correct 2 ms 504 KB correct
10 Correct 2 ms 504 KB correct
11 Correct 2 ms 504 KB correct
12 Correct 2 ms 504 KB correct
13 Correct 2 ms 508 KB correct
14 Correct 5 ms 632 KB correct
15 Correct 4 ms 632 KB correct
16 Correct 4 ms 632 KB correct
17 Correct 4 ms 632 KB correct
18 Correct 3 ms 504 KB correct
19 Correct 4 ms 632 KB correct
20 Correct 4 ms 632 KB correct
21 Correct 4 ms 632 KB correct
22 Correct 3 ms 632 KB correct
23 Correct 3 ms 632 KB correct
24 Correct 3 ms 632 KB correct
25 Correct 2 ms 632 KB correct
26 Correct 3 ms 632 KB correct
27 Correct 3 ms 632 KB correct
28 Correct 3 ms 632 KB correct
29 Correct 2 ms 632 KB correct
30 Correct 3 ms 632 KB correct
31 Correct 3 ms 632 KB correct
32 Correct 3 ms 632 KB correct
33 Correct 3 ms 632 KB correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 504 KB correct
2 Correct 2 ms 504 KB correct
3 Correct 2 ms 504 KB correct
4 Correct 2 ms 504 KB correct
5 Correct 2 ms 504 KB correct
6 Correct 2 ms 504 KB correct
7 Correct 2 ms 376 KB correct
8 Correct 2 ms 504 KB correct
9 Correct 2 ms 504 KB correct
10 Correct 2 ms 504 KB correct
11 Correct 2 ms 504 KB correct
12 Correct 2 ms 504 KB correct
13 Correct 2 ms 508 KB correct
14 Correct 5 ms 632 KB correct
15 Correct 4 ms 632 KB correct
16 Correct 4 ms 632 KB correct
17 Correct 4 ms 632 KB correct
18 Correct 3 ms 504 KB correct
19 Correct 4 ms 632 KB correct
20 Correct 4 ms 632 KB correct
21 Correct 4 ms 632 KB correct
22 Correct 3 ms 632 KB correct
23 Correct 3 ms 632 KB correct
24 Correct 3 ms 632 KB correct
25 Correct 2 ms 632 KB correct
26 Correct 3 ms 632 KB correct
27 Correct 3 ms 632 KB correct
28 Correct 3 ms 632 KB correct
29 Correct 2 ms 632 KB correct
30 Correct 3 ms 632 KB correct
31 Correct 3 ms 632 KB correct
32 Correct 3 ms 632 KB correct
33 Correct 3 ms 632 KB correct
34 Correct 197 ms 2908 KB correct
35 Correct 186 ms 2936 KB correct
36 Correct 126 ms 2464 KB correct
37 Correct 11 ms 1016 KB correct
38 Correct 193 ms 2924 KB correct
39 Correct 162 ms 2808 KB correct
40 Correct 129 ms 2396 KB correct
41 Correct 191 ms 2960 KB correct
42 Correct 192 ms 2936 KB correct
43 Correct 105 ms 2168 KB correct
44 Correct 80 ms 1960 KB correct
45 Correct 94 ms 1904 KB correct
46 Correct 70 ms 1736 KB correct
47 Correct 33 ms 1272 KB correct
48 Correct 4 ms 888 KB correct
49 Correct 11 ms 1016 KB correct
50 Correct 31 ms 1400 KB correct
51 Correct 91 ms 1912 KB correct
52 Correct 79 ms 1912 KB correct
53 Correct 70 ms 1784 KB correct
54 Correct 104 ms 2168 KB correct
55 Correct 96 ms 2044 KB correct
56 Correct 97 ms 2032 KB correct
57 Correct 97 ms 2144 KB correct

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 504 KB correct
2 Correct 2 ms 504 KB correct
3 Incorrect 150 ms 4088 KB WA in grader: NO
4 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 504 KB correct
2 Correct 2 ms 504 KB correct
3 Correct 2 ms 504 KB correct
4 Correct 2 ms 504 KB correct
5 Correct 2 ms 504 KB correct
6 Correct 2 ms 504 KB correct
7 Correct 2 ms 376 KB correct
8 Correct 2 ms 504 KB correct
9 Correct 2 ms 504 KB correct
10 Correct 2 ms 504 KB correct
11 Correct 2 ms 504 KB correct
12 Correct 2 ms 504 KB correct
13 Correct 2 ms 508 KB correct
14 Correct 5 ms 632 KB correct
15 Correct 4 ms 632 KB correct
16 Correct 4 ms 632 KB correct
17 Correct 4 ms 632 KB correct
18 Correct 3 ms 504 KB correct
19 Correct 4 ms 632 KB correct
20 Correct 4 ms 632 KB correct
21 Correct 4 ms 632 KB correct
22 Correct 3 ms 632 KB correct
23 Correct 3 ms 632 KB correct
24 Correct 3 ms 632 KB correct
25 Correct 2 ms 632 KB correct
26 Correct 3 ms 632 KB correct
27 Correct 3 ms 632 KB correct
28 Correct 3 ms 632 KB correct
29 Correct 2 ms 632 KB correct
30 Correct 3 ms 632 KB correct
31 Correct 3 ms 632 KB correct
32 Correct 3 ms 632 KB correct
33 Correct 3 ms 632 KB correct
34 Correct 197 ms 2908 KB correct
35 Correct 186 ms 2936 KB correct
36 Correct 126 ms 2464 KB correct
37 Correct 11 ms 1016 KB correct
38 Correct 193 ms 2924 KB correct
39 Correct 162 ms 2808 KB correct
40 Correct 129 ms 2396 KB correct
41 Correct 191 ms 2960 KB correct
42 Correct 192 ms 2936 KB correct
43 Correct 105 ms 2168 KB correct
44 Correct 80 ms 1960 KB correct
45 Correct 94 ms 1904 KB correct
46 Correct 70 ms 1736 KB correct
47 Correct 33 ms 1272 KB correct
48 Correct 4 ms 888 KB correct
49 Correct 11 ms 1016 KB correct
50 Correct 31 ms 1400 KB correct
51 Correct 91 ms 1912 KB correct
52 Correct 79 ms 1912 KB correct
53 Correct 70 ms 1784 KB correct
54 Correct 104 ms 2168 KB correct
55 Correct 96 ms 2044 KB correct
56 Correct 97 ms 2032 KB correct
57 Correct 97 ms 2144 KB correct
58 Correct 2 ms 504 KB correct
59 Correct 2 ms 504 KB correct
60 Incorrect 150 ms 4088 KB WA in grader: NO
61 Halted 0 ms 0 KB -