Submission #412688

#	Time	Username	Problem	Language	Result	Execution time	Memory
412688		usachevd0	Seats (IOI18_seats)	C++14	53 / 100	3208 ms	88068 KiB

seats

#include <bits/stdc++.h>
#ifndef LOCAL
    #include "seats.h"
#endif

using namespace std;

#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define Time (clock() * 1.0 / CLOCKS_PER_SEC)
using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;
using pil = pair<int, ll>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;
using ld = long double;
template<typename T1, typename T2> bool chkmin(T1& x, T2 y) {
    return y < x ? (x = y, true) : false;
}
template<typename T1, typename T2> bool chkmax(T1& x, T2 y) {
    return y > x ? (x = y, true) : false;
}
void debug_out() {
    cerr << endl;
}
template<typename T1, typename... T2> void debug_out(T1 A, T2... B) {
    cerr << ' ' << A;
    debug_out(B...);
}
template<typename T> void mdebug_out(T* a, int n) {
    for (int i = 0; i < n; ++i)
        cerr << a[i] << ' ';
    cerr << endl;
}
#ifdef LOCAL
    #define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
    #define mdebug(a, n) cerr << #a << ": ", mdebug_out(a, n)
#else
    #define debug(...) 1337
    #define mdebug(a, n) 1337
#endif
template<typename T> ostream& operator << (ostream& stream, const vector<T>& v) {
    for (auto& x : v)
        stream << x << ' ';
    return stream;
}
template<typename T1, typename T2> ostream& operator << (ostream& stream, const pair<T1, T2>& p) {
    return stream << p.first << ' ' << p.second;
}


const int INF32 = 1e9;
const int maxN = 1e6 + 6;
const int Dx[4] = {1, 0, -1, 0};
const int Dy[4] = {0, 1, 0, -1};
int N, M, S;
int X[maxN], Y[maxN];
vector<int> grid[maxN];

const int logN = 20;
const int NN = 1 << logN;
int lazy[2 * NN];
int mn[2 * NN], cnt[2 * NN];

void init(int v, int vl, int vr) {
    lazy[v] = 0;
    mn[v] = 0;
    cnt[v] = vr - vl + 1;
    if (vl != vr) {
        int vm = (vl + vr) >> 1;
        init(v << 1, vl, vm);
        init(v << 1 | 1, vm + 1, vr);
    }
}

void apply(int v, int delta) {
    mn[v] += delta;
    lazy[v] += delta;
}

void push(int v) {
    if (!lazy[v]) return;
    apply(v << 1, lazy[v]);
    apply(v << 1 | 1, lazy[v]);
    lazy[v] = 0;
}

void upd(int v) {
    mn[v] = mn[v << 1];
    cnt[v] = cnt[v << 1];
    if (mn[v << 1 | 1] < mn[v]) {
        mn[v] = mn[v << 1 | 1];
        cnt[v] = cnt[v << 1 | 1];
    } else if (mn[v << 1 | 1] == mn[v]) {
        cnt[v] += cnt[v << 1 | 1];
    }
}

void add(int v, int vl, int vr, int l, int r, int delta) {
    if (l > r || vr < l || r < vl) return;
    if (l <= vl && vr <= r) {
        apply(v, delta);
        return;
    }
    int vm = (vl + vr) >> 1;
    push(v);
    add(v << 1, vl, vm, l, r, delta);
    add(v << 1 | 1, vm + 1, vr, l, r, delta);
    upd(v);
}
void add(int l, int r, int delta) {
    //debug(l, r, delta);
    chkmax(l, 1);
    chkmin(r, S);
    if (l > r) return;
    add(1, 1, S, l, r, delta);
}

void rec(int x, int y, int d, int delta) {
    int x1 = x + Dx[d], y1 = y + Dy[d];
    int x2 = x + Dx[(d + 1) % 4], y2 = y + Dy[(d + 1) % 4];
    int x3 = x + Dx[d] + Dx[(d + 1) % 4], y3 = y + Dy[d] + Dy[(d + 1) % 4];
    int v = grid[x][y];
    int v1 = grid[x1][y1];
    int v2 = grid[x2][y2];
    int v3 = grid[x3][y3];
    add(max(v1, v2), v - 1, delta);
    add(v, min({v1, v2, v3}) - 1, delta);
}

int gt() {
    if (mn[1] == 4)
        return cnt[1];
    return 0;
}

void give_initial_chart(int _N, int _M, vector<int> _X, vector<int> _Y) {
    N = _N, M = _M;
    S = N * M;
    for (int x = 0; x <= N + 2; ++x)
        grid[x].assign(M + 3, INF32);
    for (int i = 1; i <= N * M; ++i) {
        X[i] = _X[i - 1] + 1;
        Y[i] = _Y[i - 1] + 1;
        grid[X[i]][Y[i]] = i;
    }
    init(1, 1, S);
    for (int x = 1; x <= N; ++x)
        for (int y = 1; y <= M; ++y)
            for (int d = 0; d < 4; ++d)
                rec(x, y, d, 1);
    //exit(0);
}

const int swap_sgn[2] = {-1, 1};
int swap_seats(int a, int b) {
    ++a;
    ++b;
    vector<int> v = {a, b};
    for (int rot = 0; rot < 2; ++rot) {
        for (int i : {a, b}) {
            int x = X[i], y = Y[i];
            for (int d = 0; d < 4; ++d) {
                rec(x, y, d, swap_sgn[rot]);
                int x1 = x + Dx[d], y1 = y + Dy[d];
                for (int u = 1; u <= 2; ++u) {
                    rec(x1, y1, (d + u) % 4, swap_sgn[rot]);
                }
                int x3 = x + Dx[d] + Dx[(d + 1) % 4], y3 = y + Dy[d] + Dy[(d + 1) % 4];
                rec(x3, y3, d ^ 2, swap_sgn[rot]);
            }
        }
        if (rot == 1) break;
        swap(X[a], X[b]);
        swap(Y[a], Y[b]);
        grid[X[a]][Y[a]] = a;
        grid[X[b]][Y[b]] = b;
    }
    return gt();
}

#ifdef LOCAL

int read_int() {
  int x;
  if (scanf("%d", &x) != 1) {
    fprintf(stderr, "Error while reading input\n");
    exit(1);
  }
  return x;
}

int32_t main() {
#ifdef LOCAL
    freopen("in", "r", stdin);
#endif
    ios::sync_with_stdio(0);
    cin.tie(0);
    
int H = read_int();
  int W = read_int();
  int Q = read_int();
  std::vector<int> R(H * W), C(H * W);
  for (int i = 0; i < H * W; ++i) {
    R[i] = read_int();
    C[i] = read_int();
  }
  std::vector<int> A(Q), B(Q);
  for (int j = 0; j < Q; ++j) {
    A[j] = read_int();
    B[j] = read_int();
  }

  give_initial_chart(H, W, R, C);
  for (int j = 0; j < Q; ++j) {
    int answer = swap_seats(A[j], B[j]);
    printf("%d\n", answer);
  }

    return 0;
}
#endif

• Subtask 1: 0 / 5
• Subtask 2: 0 / 6
• Subtask 3: 20 / 20
• Subtask 4: 0 / 6
• Subtask 5: 33 / 33
• Subtask 6: 0 / 30