| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 1090292 | underwaterkillerwhale | Seats (IOI18_seats) | C++17 | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#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 = 1e6 + 7;
const int Mod = 1e9 + 2022; ///loonf mod sai
const int INF = 1e9;
const ll BASE = 137;
const int szBL = 350;
int n, m, Q;
pii seat[N];
vector<vector<int>> a;
namespace sub2 {
pii pmn[N], pmx[N];
int solution (int u, int v) {
swap(seat[u], seat[v]);
a[seat[u].fs][seat[u].se] = u;
a[seat[v].fs][seat[v].se] = v;
pmn[0] = MP(INF, INF);
int res = 0;
rep (T, 1, n * m) {
pmn[T].fs = min (pmn[T - 1].fs, seat[T].fs);
pmn[T].se = min (pmn[T - 1].se, seat[T].se);
pmx[T].fs = max (pmx[T - 1].fs, seat[T].fs);
pmx[T].se = max (pmx[T - 1].se, seat[T].se);
if ((pmx[T].fs - pmn[T].se + 1) * (pmx[T].se - pmn[T].se + 1) == T) ++res;
}
return res;
}
}
namespace sub4 {
struct Fenwick_Tree {
int m;
int fen[N];
void init (int n) {
m = n;
}
void update (int pos, int val) {
for (; pos <= m; pos += pos &-pos) fen[pos] += val;
}
int get (int pos) {
int res = 0;
for (;pos > 0; pos -= pos & -pos) res += fen[pos];
return res;
}
}BIT;
pii pmn[N], pmx[N];
bool ok[N], hasinit = 0;
void init () {
hasinit = 1;
BIT.init(n * m);
pmn[0] = MP(INF, INF);
int res = 0;
rep (T, 1, n * m) {
pmn[T].fs = min (pmn[T - 1].fs, seat[T].fs);
pmn[T].se = min (pmn[T - 1].se, seat[T].se);
pmx[T].fs = max (pmx[T - 1].fs, seat[T].fs);
pmx[T].se = max (pmx[T - 1].se, seat[T].se);
if ((pmx[T].fs - pmn[T].se + 1) * (pmx[T].se - pmn[T].se + 1) == T) {
ok[T] = 1;
BIT.update(T, 1);
}
}
}
int solution (int u, int v) {
if (!hasinit)
init();
swap(seat[u], seat[v]);
a[seat[u].fs][seat[u].se] = u;
a[seat[v].fs][seat[v].se] = v;
rep (T, min(u, v), max(u, v))
if (ok[T]) BIT.update(T, -1), ok[T] = 0;
rep (T, min(u, v), max(u, v)) {
pmn[T].fs = min (pmn[T - 1].fs, seat[T].fs);
pmn[T].se = min (pmn[T - 1].se, seat[T].se);
pmx[T].fs = max (pmx[T - 1].fs, seat[T].fs);
pmx[T].se = max (pmx[T - 1].se, seat[T].se);
if ((pmx[T].fs - pmn[T].se + 1) * (pmx[T].se - pmn[T].se + 1) == T) {
ok[T] = 1;
BIT.update(T, 1);
}
}
return BIT.get(n * m);
}
}
namespace sub3 {
struct Segment_Tree {
int m;
pii st[N << 2];
void init (int n) {
m = n;
rep (i, 1, n << 2) st[i] = MP(INF, 0);
}
void update (int id, int l, int r, int pos, int val) {
if (l > pos || r < pos) return;
if (l == r) {
st[id] = MP(val, val);
return;
}
int mid = l + r >> 1;
update (id << 1, l, mid, pos, val);
update (id << 1 | 1, mid + 1, r, pos, val);
st[id].fs = min(st[id << 1].fs, st[id << 1 | 1].fs);
st[id].se = max(st[id << 1].se, st[id << 1 | 1].se);
}
pii get (int id, int l, int r, int u, int v) {
if (l > v || r < u) return MP(INF, 0);
if (l >= u && r <= v) return st[id];
int mid = l + r >> 1;
pii lc = get (id << 1, l, mid, u, v);
pii rc = get (id << 1 | 1, mid + 1, r, u, v);
return MP(min(lc.fs, rc.fs), max(lc.se, rc.se));
}
void update (int pos, int val) {
update (1, 1, m, pos, val);
}
pii get (int u, int v) {
return get (1, 1, m, u, v);
}
}rw, cl;
bool hasinit = 0;
void init () {
hasinit = 1;
rw.init(n * m);
cl.init(n * m);
rep (T, 1, n * m) {
rw.update(T, seat[T].fs);
cl.update(T, seat[T].se);
}
}
int solution (int u, int v) {
if (!hasinit) init();
swap(seat[u], seat[v]);
rw.update (u, seat[u].fs);
rw.update (v, seat[v].fs);
cl.update (u, seat[u].se);
cl.update (v, seat[v].se);
int res = 0;
rep (T, 1, n * m) {
pii curR = rw.get(1, T), curC = cl.get(1, T);
pii curmn = MP(curR.fs, curC.fs);
pii curmx = MP(curR.se, curC.se);
int delta = (curmx.fs - curmn.fs + 1) * (curmx.se - curmn.se + 1);
if (delta == T) {
++res;
}
else T = delta - 1;
}
return res;
}
}
int swap_seat (int u, int v) {
++u, ++v;
if (n <= 1e3 && m <= 1e3)
return sub3 :: solution(u, v);
else if (abs(u - v) <= 1e4)
return sub4 :: solution(u, v);
else if (n * m <= 1e4)
return sub2 :: solution(u, v);
}
void give_initial_chart (int _n, int _m, vector<int> _R, vector<int> _C) {
n = _n;
m = _m;
rep (i, 1, n * m)
seat[i] = MP(_R[i - 1] + 1, _C[i - 1] + 1);
a.resize(n + 2, vector<int> (m + 2, 0));
rep (i, 1, n * m)
a[seat[i].fs][seat[i].se] = i;
}
void solution() {
cin >> n >> m >> Q;
rep (i, 1, n * m) {
cin >> seat[i].fs >> seat[i].se;
++seat[i].fs;
++seat[i].se;
}
a.resize(n + 2, vector<int> (m + 2, 0));
rep (i, 1, n * m) a[seat[i].fs][seat[i].se] = i;
rep (i, 1, Q) {
int u, v;
cin >> u >> v;
cout << swap_seat (u, v) <<"\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;
//// cin >> num_Test;
// while (num_Test--)
// solution();
//}
/*
no bug +8
chu y break hay return se lam hong logic
xet transition cua i va i + 1
construct ket qua
chu y truong hop : KHONG CO GI
ko làm được
hướng 1: đổi hướng làm
hướng 2: đưa ra nhận xét
2 3 2
0 0
1 0
1 1
0 1
0 2
1 2
0 5
5 0
*/