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Submission #1027958

# Submission time Handle Problem Language Result Execution time Memory
1027958 2024-07-19T11:57:48 Z Issa Tiles (BOI24_tiles) C++17
30 / 100
 31 ms 11612 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define ent "\n"

const int maxn = 1e6 + 100;
const ll INF = (ll)1e18 + 100;
const int inf = 1e9 + 100;
const int MOD = 1e9 + 123;
const int maxl = 26;
const int P = 31;

int n, m;
int a[maxn];
int b[maxn];
int c[1010][1010];
vector<int> s;
struct asd{
	int r, cr;
	int l, cl;
	int ok[2];
} d[maxn * 4];
int t[maxn * 4];

void calc(int v, int tl, int tr, int mid){
	d[v].ok[0] = d[v<<1].ok[0] & d[v<<1|1].ok[0];
	d[v].ok[1] = d[v<<1].ok[1] & d[v<<1|1].ok[1];
	if(d[v<<1].l > s[tl] && d[v<<1|1].r < s[tr]){
		if(d[v<<1].cl == d[v<<1|1].cr){
			d[v].ok[d[v<<1].cl] &= (d[v<<1].l ^ d[v<<1|1].r) & 1;
		} else{
			d[v].ok[d[v<<1].cl] &= (d[v<<1].l ^ s[mid]) & 1;
			d[v].ok[d[v<<1|1].cr] &= (d[v<<1|1].r ^ s[mid+1]) & 1;
		}
	}
	d[v].r = d[v<<1].r;
	d[v].cr = d[v<<1].cr;
	if(d[v<<1|1].cr == d[v].cr && d[v].r == s[mid]) d[v].r = d[v<<1|1].r;
	d[v].l = d[v<<1|1].l;
	d[v].cl = d[v<<1|1].cl;
	if(d[v<<1].cl == d[v].cl && d[v].l == s[mid+1]) d[v].l = d[v<<1].l;
}

void build(int v = 1, int tl = 0, int tr = s.size() - 1){
	if(tl == tr){
		d[v] = {s[tl], 0, s[tl], 0, {1, 1}};
	} else{
		int mid = (tl + tr) >> 1;
		build(v<<1, tl, mid);
		build(v<<1|1, mid+1, tr);
		calc(v, tl, tr, mid);
	}
}

void pre(int v){
	t[v] ^= 1;
	d[v].cr ^= 1;
	d[v].cl ^= 1;
	swap(d[v].ok[0], d[v].ok[1]);
}

void push(int v, int tl, int tr){
	if(tl == tr || !t[v]) return;
	t[v] = 0; pre(v<<1); pre(v<<1|1);
}

void upd(int l, int r, int v = 1, int tl = 0, int tr = s.size()-1){
	push(v, tl, tr);
	if(s[tl] > r || s[tr] < l) return;
	if(l <= s[tl] && s[tr] <= r) pre(v);
	else{
		int mid = (tl + tr) >> 1;
		upd(l, r, v<<1, tl, mid);
		upd(l, r, v<<1|1 ,mid+1, tr);
		calc(v, tl, tr, mid);
	}
}

void out(int v = 1, int tl = 0, int tr = s.size() - 1){
	push(v, tl, tr);
	if(tl == tr) cout << d[v].cl << ' ';
	else{
		int mid = (tl + tr) >> 1;
		out(v<<1, tl, mid);
		out(v<<1|1, mid+1, tr);
	}
}

void test(){
	cin >> n >> m;
	int mx = 0;
	bool ok = 1;
	for(int i = 1; i <= n; i++){
		cin >> a[i] >> b[i];
		mx = max(mx, b[i]);
		ok &= (a[i] & 1);
	}
	if(ok){
		vector<pair<int, pii>> g;
		for(int i = 1; i <= n; i++){
			int j = i - 1;
			if(!j) j = n;
			if(a[i] == a[j]){
				int l = min(b[i], b[j]);
				int r = b[i] + b[j] - l;
				r--;
				s.push_back(l);
				s.push_back(r);
				s.push_back(r+1);
				s.push_back(l-1);
				g.push_back({a[i], {l, r}});
			}
		}
		sort(s.begin(), s.end());
		s.resize(unique(s.begin(), s.end()) - s.begin());
		build(); int ans = 0;
		sort(g.begin(), g.end());
		for(int i = 0; i < g.size(); i++){
			auto [l, r] = g[i].second;
			upd(l, r);
			// cout << l << ' ' << r << endl;
			if(i + 1 < g.size() && g[i].first < g[i+1].first){
				// out(); cout << endl;
				int f = d[1].ok[1];
				if(d[1].cr) f &= (d[1].r ^ s[0]) & 1;
				if(d[1].cl) f &= (d[1].l ^ s.back()) & 1;
				if(f){
					ans = g[i+1].first;
				} else break;
			}
		}
		cout << ans;
	} else if(m > 1000 || mx > 1000){
		vector<int> v;
		for(int i = 2; i <= n; i++){
			while(v.size() > 1){
				int k = v[v.size()-2], j = v.back();
				if(a[k] == a[j] && a[j] == a[i]) v.pop_back();
				else if(b[k] == b[j] && b[j] == b[i]) v.pop_back();
				else break;
			} v.push_back(i);
		}
		int ans = 0;
		for(int i: v){
			if((b[i] & 1 )|| !b[i]) break;
			ans = a[i] - (a[i] & 1);
			if(a[i] & 1) break;
		}
		cout << ans;
	} else{
		for(int i = 1; i <= n; i++){
			int j = i - 1;
			if(!j) j = n;
			if(a[i] == a[j]){
				int l = min(b[i], b[j]);
				int r = b[i] + b[j] - l;
				for(int y = l; y < r; y++){
					c[a[i]][y] ^= 1;
				}
			}
		}
		for(int i = 0; i < m; i++){
			for(int j = 0; j <= 1000; j++){
				if(i) c[i][j] ^= c[i-1][j];
			}
		}
		int ans = 0;
		for(int i = 0; i < m; i++){
			int ok = 0;
			for(int j = 0; j <= 1000; j++){
				if(c[i][j]){
					ok = 1;
					if(c[i+1][j] && c[i][j+1] && c[i+1][j+1]){
						c[i][j] = 0;
						c[i+1][j] = 0;
						c[i][j+1] = 0;
						c[i+1][j+1] = 0;
					} else{
						ok = 2;
						break;
					}
				}
			}
			if(ok == 2) break;
			if(ok == 1) continue;
			ans = i + 1;
		}
		cout << ans;
	}
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int t; t = 1;
    while(t--) test();
    cout << ent;
}

Compilation message

Main.cpp: In function 'void test()':
Main.cpp:120:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  120 |   for(int i = 0; i < g.size(); i++){
      |                  ~~^~~~~~~~~~
Main.cpp:124:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  124 |    if(i + 1 < g.size() && g[i].first < g[i+1].first){
      |       ~~~~~~^~~~~~~~~~

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 2 ms 8540 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 2 ms 8660 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 8540 KB Output is correct
9 Incorrect 1 ms 6492 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #2
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 2 ms 8540 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 2 ms 8660 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 8540 KB Output is correct
9 Incorrect 1 ms 6492 KB Output isn't correct
10 Halted 0 ms 0 KB -

Subtask #3
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8536 KB Output is correct
2 Correct 5 ms 7000 KB Output is correct
3 Correct 31 ms 7636 KB Output is correct
4 Correct 14 ms 7136 KB Output is correct
5 Correct 14 ms 7136 KB Output is correct
6 Correct 2 ms 8540 KB Output is correct
7 Correct 2 ms 8540 KB Output is correct
8 Correct 26 ms 7764 KB Output is correct
9 Correct 15 ms 7136 KB Output is correct
10 Correct 27 ms 7764 KB Output is correct
11 Correct 17 ms 7136 KB Output is correct
12 Correct 1 ms 6492 KB Output is correct
13 Correct 31 ms 7772 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 1 ms 6492 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6536 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 2 ms 8540 KB Output is correct
5 Correct 17 ms 8540 KB Output is correct
6 Correct 25 ms 8668 KB Output is correct
7 Correct 2 ms 8552 KB Output is correct
8 Correct 2 ms 8540 KB Output is correct
9 Correct 2 ms 8540 KB Output is correct
10 Correct 3 ms 8540 KB Output is correct
11 Correct 2 ms 8540 KB Output is correct
12 Correct 2 ms 8540 KB Output is correct
13 Correct 3 ms 8536 KB Output is correct
14 Correct 2 ms 8596 KB Output is correct
15 Correct 2 ms 8540 KB Output is correct
16 Correct 2 ms 8540 KB Output is correct
17 Correct 17 ms 8540 KB Output is correct
18 Correct 17 ms 8672 KB Output is correct
19 Correct 3 ms 8540 KB Output is correct
20 Correct 2 ms 8540 KB Output is correct
21 Correct 1 ms 8540 KB Output is correct
22 Correct 1 ms 8540 KB Output is correct
23 Correct 1 ms 6488 KB Output is correct
24 Correct 3 ms 8540 KB Output is correct
25 Correct 2 ms 8668 KB Output is correct
26 Correct 1 ms 6492 KB Output is correct
27 Correct 2 ms 8540 KB Output is correct
28 Correct 1 ms 6492 KB Output is correct
29 Correct 1 ms 6492 KB Output is correct
30 Correct 1 ms 8540 KB Output is correct
31 Correct 1 ms 8540 KB Output is correct
32 Correct 1 ms 8540 KB Output is correct
33 Correct 3 ms 8540 KB Output is correct
34 Correct 1 ms 6492 KB Output is correct
35 Correct 1 ms 6492 KB Output is correct
36 Correct 2 ms 8540 KB Output is correct
37 Correct 2 ms 8664 KB Output is correct
38 Correct 2 ms 8540 KB Output is correct
39 Correct 2 ms 8540 KB Output is correct
40 Correct 2 ms 8792 KB Output is correct
41 Correct 2 ms 8540 KB Output is correct
42 Correct 1 ms 6492 KB Output is correct
43 Correct 1 ms 6492 KB Output is correct
44 Correct 1 ms 6492 KB Output is correct
45 Correct 1 ms 6608 KB Output is correct
46 Correct 2 ms 8536 KB Output is correct
47 Correct 1 ms 6492 KB Output is correct
48 Correct 2 ms 8540 KB Output is correct
49 Correct 20 ms 10188 KB Output is correct
50 Correct 18 ms 10076 KB Output is correct
51 Correct 18 ms 10320 KB Output is correct
52 Correct 19 ms 10064 KB Output is correct
53 Correct 3 ms 8540 KB Output is correct
54 Correct 1 ms 6492 KB Output is correct
55 Correct 3 ms 8540 KB Output is correct
56 Correct 3 ms 8540 KB Output is correct
57 Correct 2 ms 8536 KB Output is correct
58 Correct 1 ms 6492 KB Output is correct
59 Correct 2 ms 8672 KB Output is correct
60 Correct 1 ms 6488 KB Output is correct
61 Correct 1 ms 6616 KB Output is correct
62 Correct 1 ms 6492 KB Output is correct
63 Correct 3 ms 8540 KB Output is correct
64 Correct 3 ms 8540 KB Output is correct
65 Correct 2 ms 8540 KB Output is correct
66 Correct 2 ms 8540 KB Output is correct
67 Correct 2 ms 8540 KB Output is correct
68 Correct 2 ms 8540 KB Output is correct
69 Correct 2 ms 8540 KB Output is correct
70 Correct 2 ms 8540 KB Output is correct
71 Correct 2 ms 8680 KB Output is correct
72 Correct 1 ms 6492 KB Output is correct

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 16 ms 7264 KB Output is correct
3 Correct 15 ms 7136 KB Output is correct
4 Correct 17 ms 8540 KB Output is correct
5 Correct 18 ms 10168 KB Output is correct
6 Correct 3 ms 8540 KB Output is correct
7 Correct 2 ms 8660 KB Output is correct
8 Incorrect 27 ms 11328 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #6
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 7632 KB Output is correct
2 Correct 16 ms 7268 KB Output is correct
3 Correct 2 ms 8540 KB Output is correct
4 Incorrect 27 ms 11612 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 2 ms 8540 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 2 ms 8660 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 8540 KB Output is correct
9 Incorrect 1 ms 6492 KB Output isn't correct
10 Halted 0 ms 0 KB -