oj.uz

Submission #1113869

# Submission time Handle Problem Language Result Execution time Memory
1113869 2024-11-17T16:14:10 Z thelegendary08 Fire (BOI24_fire) C++17
21 / 100
 2000 ms 76548 KB 
#include<bits/stdc++.h>
#define pb push_back
#define int long long
#define vi vector<int>
#define vvi vector<vector<int>>
#define pii pair<int, int>
#define vpii vector<pair<int, int>>
#define vc vector<char>
#define vb vector<bool>
#define mii map<int,int>
#define f0r(i,n) for(int i=0;i<n;i++)
#define FOR(i,k,n) for(int i=k;i<n;i++)
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define in(a) int a; cin>>a
#define in2(a,b) int a,b; cin>>a>>b
#define in3(a,b,c) int a,b,c; cin>>a>>b>>c
#define in4(a,b,c,d) int a,b,c,d; cin>>a>>b>>c>>d
#define vin(v,n); vi v(n); f0r(i,n){cin>>v[i];}
#define out(a) cout<<a<<'\n'
#define out2(a,b) cout<<a<<' '<<b<<'\n'
#define out3(a,b,c) cout<<a<<' '<<b<<' '<<c<<'\n'
#define out4(a,b,c,d) cout<<a<<' '<<b<<' '<<c<<' '<<d<<'\n'
#define vout(v) for(auto u : v){cout<<u<<' ';} cout<<'\n'
#define dout(a) cout<<a<<' '<<#a<<'\n'
#define dout2(a,b) cout<<a<<' '<<#a<<' '<<b<<' '<<#b<<'\n'
#define yn(x); if(x){cout<<"YES"<<'\n';}else{cout<<"NO"<<'\n';}
const int leg = 1e9 + 7;
const int mod = 998244353;
using namespace std;
signed main(){
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	//ifstream cin(".in");
	//ofstream cout(".out");
	in2(n,m);
	vpii v;
	f0r(i,n){
		in2(a,b);
		v.pb({a,b});
	}
	sort(all(v));
	vpii w;
	int mx = -1;
	f0r(i, n){
		if(v[i].second + (v[i].first > v[i].second) * m > mx){
			w.pb(v[i]);
			mx = v[i].second + (v[i].first > v[i].second) * m;
		}
	}
	n = w.size();
	
	f0r(i, n){
		//out2(w[i].first, w[i].second);
	}
	
	bool ok = 1;
	f0r(i, n-1){
		if(w[i].first < w[i].second){
			if(!(w[i+1].first <= w[i].second && w[i].first <= w[i+1].first))ok = 0;
		}
		else{
			if(!(w[i+1].first >= w[i].first || w[i+1].first <= w[i].second))ok = 0;
		}
	}
	if(w[n-1].first < w[n-1].second || w[n-1].second < w[0].first)ok = 0;
	if(!ok || n < 2)out(-1);
	else{
		int ptr = 0;
		vi nxt(n);
		f0r(i, n){
			int save = ptr;
			if(w[i].first < w[i].second){
				while(w[i].first <= w[ptr].first && w[ptr].first <= w[i].second){
					ptr++;
					ptr %= n;
					if(ptr == save){
						break;
					}
				}
			}
			else{
				while(w[ptr].first >= w[i].first || w[ptr].first <= w[i].second){
					ptr++;
					ptr %= n;
					if(ptr == save)break;
				}
			}
			if(ptr != 0)nxt[i] = ptr - 1;
		
			else nxt[i] = n-1;
		}
		//vout(nxt);
		
		
		pii jmp[n][20];
		f0r(i, n){
			int loops = 0;
			if(w[i].first > w[i].second)loops++;
			if(w[i].second > w[nxt[i]].second)loops++;
			jmp[i][0] = {nxt[i], loops};
		}
		FOR(i, 1, 20){
			f0r(j,n){
				jmp[j][i] = {jmp[jmp[j][i-1].first][i-1].first, (jmp[j][i-1].second + jmp[jmp[j][i-1].first][i-1].second - (w[jmp[j][i-1].first].first > w[jmp[j][i-1].first].second))};
			}
		}
		f0r(i, n){
			//out2(jmp[i][0].first, jmp[i][0].second);
		}
		//out("");
		f0r(i, n){
			//out2(jmp[i][1].first, jmp[i][1].second);
		}
		
		int ans = 4e18;
		f0r(i, n){
			if(jmp[i][0].second == 1 && w[jmp[i][0].first].second >= w[i].first){
				ans = min(ans, 2ll);
			}
			else{
				int cur = 0;
				int dex = i;
				int loops = 0;
				for(int j = 19; j>=0; j--){
					if(loops == 0){
						if(jmp[dex][j].second == 1 && w[jmp[dex][j].first].second < w[i].first){
							cur += (1 << j);
							loops++;
							dex = jmp[dex][j].first;
							//out("path 1");
						}
						else if(jmp[dex][j].second == 0){
							cur += (1 << j);
							dex = jmp[dex][j].first;
							//out("path 2");
						}
					}
					else if(loops == 1){
						if((jmp[dex][j].second == 0 || (jmp[dex][j].second == 1  && w[dex].first > w[dex].second)) && w[jmp[dex][j].first].second < w[i].first){
							cur += (1 << j);
							dex = jmp[dex][j].first;
							//out("path 3");
						}
					}
					//dout2(loops, dex);
				}
				//out(cur+2);
				ans = min(ans, cur + 2);
			}
			
		}
		if(ans != 4e18)out(ans);
		else out(-1);
	}
	
	
}

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Incorrect 1 ms 336 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Incorrect 1 ms 336 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Incorrect 1 ms 336 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 1 ms 336 KB Output is correct
12 Correct 1 ms 336 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 1 ms 336 KB Output is correct
15 Correct 4 ms 2128 KB Output is correct
16 Correct 4 ms 2368 KB Output is correct
17 Correct 4 ms 848 KB Output is correct
18 Correct 4 ms 2384 KB Output is correct
19 Correct 2 ms 604 KB Output is correct
20 Correct 22 ms 7308 KB Output is correct
21 Correct 54 ms 16968 KB Output is correct
22 Correct 54 ms 14780 KB Output is correct
23 Correct 154 ms 75564 KB Output is correct
24 Correct 132 ms 62020 KB Output is correct
25 Execution timed out 2081 ms 9400 KB Time limit exceeded
26 Halted 0 ms 0 KB -

Subtask #5
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 504 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 1 ms 336 KB Output is correct
12 Correct 4 ms 2128 KB Output is correct
13 Correct 3 ms 2128 KB Output is correct
14 Correct 3 ms 2128 KB Output is correct
15 Correct 21 ms 6772 KB Output is correct
16 Correct 164 ms 72756 KB Output is correct
17 Correct 144 ms 72644 KB Output is correct
18 Correct 151 ms 76548 KB Output is correct
19 Correct 156 ms 76480 KB Output is correct
20 Correct 164 ms 75624 KB Output is correct

Subtask #6
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Incorrect 1 ms 336 KB Output isn't correct
4 Halted 0 ms 0 KB -