Submission #1087099

#	Time	Username	Problem	Language	Result	Execution time	Memory
1087099		underwaterkillerwhale	September (APIO24_september)	C++17	100 / 100	181 ms	23496 KiB

september

#include <bits/stdc++.h>
#define ll              long long
#define pii             pair<int,int>
#define pll             pair<ll,ll>
#define rep(i,m,n)      for(int i=(m); i<=(n); i++)
#define reb(i,m,n)      for(int i=(m); i>=(n); i--)
#define iter(id, v)     for(auto id : v)
#define fs              first
#define se              second
#define MP              make_pair
#define pb              push_back
#define bit(msk, i)     ((msk >> i) & 1)
#define SZ(v)           (ll)v.size()
#define ALL(v)          v.begin(),v.end()

using namespace std;

mt19937_64 rd(chrono :: steady_clock :: now ().time_since_epoch().count());
ll Rand (ll l, ll r) { return uniform_int_distribution<ll> (l, r) (rd); }

const int N = 1e5 + 7;
const int Mod = 1e9 + 7;
const int INF = 1e9;
const ll BASE = 137;
const int szBL = 350;

int n, m;
int P[N];
vector<int> ke[N];

int pos[N];
pii rr[N];
int mnP[N], mxC[N];

void dfs (int u, int p) {
    rr[u].fs = min(rr[u].fs, pos[u]);
    mxC[u] = pos[u];
    iter (&v, ke[u]) {
        dfs(v, u);
        mxC[u] = max(mxC[u], mxC[v]);
    }
    rr[u].se = max(rr[u].se, mxC[u]);
}

int solve (int _n, int _m, vector<int> _P, vector<vector<int>> _S) {
    rep (i, 0, n) vector<int> ().swap(ke[i]);
    n = _n;
    m = _m;
    --n;
    rep (i, 1, n) {
        P[i] = _P[i];
        ke[P[i]].pb(i);
    }
    rep (i, 1, n) rr[i].fs = INF, rr[i].se = 0;

    rep (j, 1, m) {
        rep (i, 1, n) {
            int x;
            x = _S[j - 1][i - 1];
            pos[x] = i;
        }
        dfs(0, 0);
        mnP[0] = INF;
        rep (i, 1, n) {
            mnP[i] = min(mnP[P[i]], pos[i]);
            if (mnP[i] < pos[i]) {
                rr[i].fs = min(rr[i].fs, rr[P[i]].fs);
                rr[i].se = max(rr[i].se, rr[P[i]].se);
            }
        }
    }

    sort (rr + 1, rr + 1 + n, [] (pii A, pii B) { return A.fs < B.fs || (A.fs == B.fs && A.se > B.se); });
    int res = 0;
    int L = -1, R = -1;
    rep (i, 1, n) {
        pii id = rr[i];
        if (R < id.fs) {
            ++res;
            tie(L, R) = id;
        }
        R = max(R, id.se);
    }
    return res;
}

void solution() {
    rep (i, 0, n) vector<int> ().swap(ke[i]);

    cin >> n >> m;
    --n;
    rep (i, 1, n) {
        cin >> P[i];
        ke[P[i]].pb(i);
    }
    rep (i, 1, n) rr[i].fs = INF, rr[i].se = 0;

    rep (j, 1, m) {
        rep (i, 1, n) {
            int x; cin >> x;
            pos[x] = i;
        }
        dfs(0, 0);
        mnP[0] = INF;
        rep (i, 1, n) {
            mnP[i] = min(mnP[P[i]], pos[i]);
            if (mnP[i] < pos[i]) {
                rr[i].fs = min(rr[i].fs, rr[P[i]].fs);
                rr[i].se = max(rr[i].se, rr[P[i]].se);
            }
        }
    }
//    rep (i, 1, n) cout << i<<": "<<rr[i].fs <<","<<rr[i].se <<"\n";
//    return;
    sort (rr + 1, rr + 1 + n, [] (pii A, pii B) { return A.fs < B.fs || (A.fs == B.fs && A.se > B.se); });
    int res = 0;
    int L = -1, R = -1;
    rep (i, 1, n) {
        pii id = rr[i];
        if (R < id.fs) {
            ++res;
            tie(L, R) = id;
        }
        R = max(R, id.se);
    }
    cout << res <<"\n";
}

#define file(name) freopen(name".inp","r",stdin); \
freopen(name".out","w",stdout);
//int main () {
////    file("c");
//    ios_base :: sync_with_stdio(false); cin.tie(0); cout.tie(0);
//    int num_Test = 1;
//    cout << solve(5, 2, {-1, 0, 0, 1, 1}, {{1, 2, 3, 4}, {4, 1, 2, 3}}) <<"\n";
////    cin >> num_Test;
////    while (num_Test--)
////        solution();
//}
/*
no bug +7
2
5 2
0 0 1 1
1 2 3 4
4 1 2 3
3 1
0 0
1 2


*/

• Subtask 1: 11 / 11
• Subtask 2: 14 / 14
• Subtask 3: 5 / 5
• Subtask 4: 9 / 9
• Subtask 5: 5 / 5
• Subtask 6: 11 / 11
• Subtask 7: 9 / 9
• Subtask 8: 11 / 11
• Subtask 9: 9 / 9
• Subtask 10: 16 / 16