oj.uz

답안 #577855

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
577855 2022-06-15T10:13:54 Z vanic Event Hopping (BOI22_events) C++14
100 / 100
 369 ms 19612 KB 
#include <cstdio>
#include <iostream>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <cstring>
#include <queue>
 
using namespace std;
 
const int maxn=1e5+5, Log=17, pot=(1<<Log), inf=1e9;
 
struct tournament{
	int t[pot*2];
	tournament(){
		for(int i=1; i<pot*2; i++){
			t[i]=inf;
		}
	}
	void update(int x, int val){
		t[x]=min(t[x], val);
		for(x/=2; x>0; x/=2){
			t[x]=min(t[x*2], t[x*2+1]);
		}
	}
	int query(int L, int D, int x, int l, int d){
		if(L>=l && D<=d){
			return t[x];
		}
		int lijeva=inf, desna=inf;
		if((L+D)/2>=l){
			lijeva=query(L, (L+D)/2, x*2, l, d);
		}
		if((L+D)/2+1<=d){
			desna=query((L+D)/2+1, D, x*2+1, l, d);
		}
		return min(lijeva, desna);
	}
	int nadji(int L, int D, int x, int l, int d, int val){
		if(L>=l && D<=d){
			if(t[x]==val){
				while(x<pot){
					if(t[x*2]==val){
						x*=2;
					}
					else{
						x=x*2+1;
					}
				}
				return x;
			}
			return -1;
		}
		int xx=-1;
		if((L+D)/2>=l){
			xx=nadji(L, (L+D)/2, x*2, l, d, val);
			if(xx!=-1){
				return xx;
			}
		}
		if((L+D)/2+1<=d){
			xx=nadji((L+D)/2+1, D, x*2+1, l, d, val);
			if(xx!=-1){
				return xx;
			}
		}
		return -1;
	}
};

tournament T;

 
pair < int, int > a[maxn];
set < int > s;
map < int, int > m;

int digni[maxn][Log];
int moj[maxn];

void precompute(){
	for(int i=1; i<Log; i++){
		for(int j=0; j<maxn; j++){
			digni[j][i]=j;
		}
	}
	for(int i=1; i<Log; i++){
		for(int j=0; j<maxn; j++){
			digni[j][i]=digni[digni[j][i-1]][i-1];
		}
	}
}

int provjeri(int x, int y){
	if(x==y){
		return 0;
	}
	if(a[y].first<=a[x].second && a[x].second<=a[y].second){
		return 1;
	}
	if(a[x].second>a[y].second){
		return -1;
	}
	int uk=1;
	x=a[x].second;
	y=moj[y];
	if(T.t[y+pot]<=x){
		return 2;
	}
//	cout << "aha " << x << ' ' <<  y << endl;
//	cout << T.t[digni[y][0]+pot] << endl;
	for(int i=Log-1; i>-1; i--){
		if(T.t[digni[y][i]+pot]>x){
//			cout << "dizem " << y << " na " << digni[y][i] << endl;
			y=digni[y][i];
			uk+=(1<<i);
		}
	}
	
	if(uk>maxn){
		return -1;
	}
	return uk+2;
}
 
int main(){
	int n, q;
	scanf("%d%d", &n, &q);
	for(int i=1; i<=n; i++){
		scanf("%d%d", &a[i].first, &a[i].second);
		s.insert(a[i].second);
	}
	int br=0;
	
	for(auto it=s.begin(); it!=s.end(); it++){
		m[*it]=br;
		br++;
	}
	set < int >::iterator it;
	for(int i=1; i<=n; i++){
		it=s.lower_bound(a[i].first);
		a[i]={m[*it], m[a[i].second]};
//		cout << a[i].first << ' ' << a[i].second << endl;
		T.update(a[i].second+pot, a[i].first);
	}
	int val, pos;
	for(int i=1; i<=n; i++){
		val=T.query(0, pot-1, 1, a[i].first, a[i].second);
//		cout << "vrijednost " << a[i].second << " je " << val << endl;
		if(val==a[i].first){
			moj[i]=a[i].second;
			continue;
		}
		pos=T.nadji(0, pot-1, 1, a[i].first, a[i].second, val);
		moj[i]=pos-pot;
	}
	int gran;
	for(int i=0; i<br; i++){
		gran=T.t[i+pot];
		val=T.query(0, pot-1, 1, gran, i);
		if(val==gran){
			digni[i][0]=i;
			continue;
		}
		pos=T.nadji(0, pot-1, 1, gran, i, val);
		digni[i][0]=pos-pot;
	}
	precompute();
/*	cout << "ovo sranje" << endl;
	for(int i=1; i<=n; i++){
		cout << moj[i] << ' ';
	}
	cout << endl;
	for(int i=0; i<br; i++){
		cout << T.t[i+pot] << ' ';
	}
	cout << endl;
	for(int i=0; i<br; i++){
		cout << digni[i][0] << ' ';
	}
	cout << endl;
	for(int i=0; i<br; i++){
		for(int j=0; j<3; j++){
			cout << digni[i][j] << ' ';
		}
		cout << endl;
	}*/
	int x, y, z;
	for(int i=0; i<q; i++){
		scanf("%d%d", &x, &y);
		z=provjeri(x, y);
		if(z==-1){
			printf("impossible\n");
		}
		else{
			printf("%d\n", z);
		}
	}
	return 0;
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:129:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  129 |  scanf("%d%d", &n, &q);
      |  ~~~~~^~~~~~~~~~~~~~~~
events.cpp:131:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  131 |   scanf("%d%d", &a[i].first, &a[i].second);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
events.cpp:191:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  191 |   scanf("%d%d", &x, &y);
      |   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 7892 KB Output is correct
2 Correct 290 ms 19168 KB Output is correct
3 Correct 284 ms 19036 KB Output is correct
4 Correct 298 ms 19096 KB Output is correct
5 Correct 262 ms 19152 KB Output is correct
6 Correct 251 ms 19236 KB Output is correct
7 Correct 308 ms 19240 KB Output is correct
8 Correct 222 ms 19548 KB Output is correct
9 Correct 227 ms 19532 KB Output is correct
10 Correct 273 ms 19424 KB Output is correct
11 Correct 240 ms 19476 KB Output is correct
12 Correct 109 ms 14900 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 7892 KB Output is correct
2 Correct 11 ms 7892 KB Output is correct
3 Correct 12 ms 8088 KB Output is correct
4 Correct 15 ms 8148 KB Output is correct
5 Correct 14 ms 8096 KB Output is correct
6 Correct 12 ms 8044 KB Output is correct
7 Correct 13 ms 8088 KB Output is correct
8 Correct 11 ms 8020 KB Output is correct
9 Correct 14 ms 7996 KB Output is correct

Subtask #3
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 7892 KB Output is correct
2 Correct 11 ms 7892 KB Output is correct
3 Correct 12 ms 8088 KB Output is correct
4 Correct 15 ms 8148 KB Output is correct
5 Correct 14 ms 8096 KB Output is correct
6 Correct 12 ms 8044 KB Output is correct
7 Correct 13 ms 8088 KB Output is correct
8 Correct 11 ms 8020 KB Output is correct
9 Correct 14 ms 7996 KB Output is correct
10 Correct 11 ms 7892 KB Output is correct
11 Correct 12 ms 7988 KB Output is correct
12 Correct 14 ms 8092 KB Output is correct
13 Correct 12 ms 8092 KB Output is correct
14 Correct 13 ms 8024 KB Output is correct
15 Correct 18 ms 8044 KB Output is correct
16 Correct 12 ms 8092 KB Output is correct
17 Correct 12 ms 8020 KB Output is correct
18 Correct 13 ms 8000 KB Output is correct
19 Correct 47 ms 8960 KB Output is correct
20 Correct 46 ms 8896 KB Output is correct
21 Correct 51 ms 9256 KB Output is correct
22 Correct 39 ms 9040 KB Output is correct
23 Correct 53 ms 9072 KB Output is correct
24 Correct 41 ms 9044 KB Output is correct
25 Correct 48 ms 8772 KB Output is correct

Subtask #4
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 7892 KB Output is correct
2 Correct 11 ms 7892 KB Output is correct
3 Correct 12 ms 8088 KB Output is correct
4 Correct 15 ms 8148 KB Output is correct
5 Correct 14 ms 8096 KB Output is correct
6 Correct 12 ms 8044 KB Output is correct
7 Correct 13 ms 8088 KB Output is correct
8 Correct 11 ms 8020 KB Output is correct
9 Correct 14 ms 7996 KB Output is correct
10 Correct 15 ms 7892 KB Output is correct
11 Correct 13 ms 7988 KB Output is correct
12 Correct 11 ms 8092 KB Output is correct
13 Correct 14 ms 8088 KB Output is correct
14 Correct 11 ms 8020 KB Output is correct
15 Correct 11 ms 8020 KB Output is correct
16 Correct 16 ms 8020 KB Output is correct
17 Correct 16 ms 8020 KB Output is correct
18 Correct 11 ms 7892 KB Output is correct
19 Correct 243 ms 18524 KB Output is correct
20 Correct 241 ms 18432 KB Output is correct
21 Correct 181 ms 13832 KB Output is correct
22 Correct 232 ms 18436 KB Output is correct
23 Correct 156 ms 18532 KB Output is correct
24 Correct 303 ms 18524 KB Output is correct
25 Correct 35 ms 9132 KB Output is correct

Subtask #5
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 320 ms 19048 KB Output is correct
2 Correct 305 ms 19020 KB Output is correct
3 Correct 273 ms 19036 KB Output is correct
4 Correct 287 ms 19544 KB Output is correct
5 Correct 310 ms 19432 KB Output is correct
6 Correct 369 ms 19160 KB Output is correct
7 Correct 306 ms 19168 KB Output is correct
8 Correct 336 ms 19420 KB Output is correct
9 Correct 144 ms 18524 KB Output is correct
10 Correct 309 ms 18952 KB Output is correct
11 Correct 258 ms 18636 KB Output is correct
12 Correct 305 ms 18816 KB Output is correct

Subtask #6
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 7892 KB Output is correct
2 Correct 290 ms 19168 KB Output is correct
3 Correct 284 ms 19036 KB Output is correct
4 Correct 298 ms 19096 KB Output is correct
5 Correct 262 ms 19152 KB Output is correct
6 Correct 251 ms 19236 KB Output is correct
7 Correct 308 ms 19240 KB Output is correct
8 Correct 222 ms 19548 KB Output is correct
9 Correct 227 ms 19532 KB Output is correct
10 Correct 273 ms 19424 KB Output is correct
11 Correct 240 ms 19476 KB Output is correct
12 Correct 109 ms 14900 KB Output is correct
13 Correct 13 ms 7892 KB Output is correct
14 Correct 11 ms 7892 KB Output is correct
15 Correct 12 ms 8088 KB Output is correct
16 Correct 15 ms 8148 KB Output is correct
17 Correct 14 ms 8096 KB Output is correct
18 Correct 12 ms 8044 KB Output is correct
19 Correct 13 ms 8088 KB Output is correct
20 Correct 11 ms 8020 KB Output is correct
21 Correct 14 ms 7996 KB Output is correct
22 Correct 11 ms 7892 KB Output is correct
23 Correct 12 ms 7988 KB Output is correct
24 Correct 14 ms 8092 KB Output is correct
25 Correct 12 ms 8092 KB Output is correct
26 Correct 13 ms 8024 KB Output is correct
27 Correct 18 ms 8044 KB Output is correct
28 Correct 12 ms 8092 KB Output is correct
29 Correct 12 ms 8020 KB Output is correct
30 Correct 13 ms 8000 KB Output is correct
31 Correct 47 ms 8960 KB Output is correct
32 Correct 46 ms 8896 KB Output is correct
33 Correct 51 ms 9256 KB Output is correct
34 Correct 39 ms 9040 KB Output is correct
35 Correct 53 ms 9072 KB Output is correct
36 Correct 41 ms 9044 KB Output is correct
37 Correct 48 ms 8772 KB Output is correct
38 Correct 15 ms 7892 KB Output is correct
39 Correct 13 ms 7988 KB Output is correct
40 Correct 11 ms 8092 KB Output is correct
41 Correct 14 ms 8088 KB Output is correct
42 Correct 11 ms 8020 KB Output is correct
43 Correct 11 ms 8020 KB Output is correct
44 Correct 16 ms 8020 KB Output is correct
45 Correct 16 ms 8020 KB Output is correct
46 Correct 11 ms 7892 KB Output is correct
47 Correct 243 ms 18524 KB Output is correct
48 Correct 241 ms 18432 KB Output is correct
49 Correct 181 ms 13832 KB Output is correct
50 Correct 232 ms 18436 KB Output is correct
51 Correct 156 ms 18532 KB Output is correct
52 Correct 303 ms 18524 KB Output is correct
53 Correct 35 ms 9132 KB Output is correct
54 Correct 320 ms 19048 KB Output is correct
55 Correct 305 ms 19020 KB Output is correct
56 Correct 273 ms 19036 KB Output is correct
57 Correct 287 ms 19544 KB Output is correct
58 Correct 310 ms 19432 KB Output is correct
59 Correct 369 ms 19160 KB Output is correct
60 Correct 306 ms 19168 KB Output is correct
61 Correct 336 ms 19420 KB Output is correct
62 Correct 144 ms 18524 KB Output is correct
63 Correct 309 ms 18952 KB Output is correct
64 Correct 258 ms 18636 KB Output is correct
65 Correct 305 ms 18816 KB Output is correct
66 Correct 10 ms 7892 KB Output is correct
67 Correct 275 ms 19020 KB Output is correct
68 Correct 297 ms 19048 KB Output is correct
69 Correct 261 ms 19080 KB Output is correct
70 Correct 263 ms 19152 KB Output is correct
71 Correct 288 ms 19288 KB Output is correct
72 Correct 254 ms 19168 KB Output is correct
73 Correct 238 ms 19612 KB Output is correct
74 Correct 225 ms 19604 KB Output is correct
75 Correct 286 ms 19420 KB Output is correct
76 Correct 280 ms 19452 KB Output is correct
77 Correct 116 ms 14900 KB Output is correct
78 Correct 10 ms 7988 KB Output is correct
79 Correct 14 ms 8088 KB Output is correct
80 Correct 18 ms 8020 KB Output is correct
81 Correct 13 ms 8020 KB Output is correct
82 Correct 17 ms 8020 KB Output is correct
83 Correct 15 ms 8092 KB Output is correct
84 Correct 11 ms 8084 KB Output is correct
85 Correct 11 ms 8000 KB Output is correct
86 Correct 51 ms 8932 KB Output is correct
87 Correct 49 ms 8988 KB Output is correct
88 Correct 54 ms 9188 KB Output is correct
89 Correct 51 ms 9048 KB Output is correct
90 Correct 40 ms 9120 KB Output is correct
91 Correct 37 ms 9132 KB Output is correct
92 Correct 49 ms 8716 KB Output is correct
93 Correct 286 ms 18528 KB Output is correct
94 Correct 230 ms 18552 KB Output is correct
95 Correct 184 ms 13804 KB Output is correct
96 Correct 272 ms 18508 KB Output is correct
97 Correct 153 ms 18476 KB Output is correct
98 Correct 266 ms 18524 KB Output is correct
99 Correct 56 ms 9068 KB Output is correct
100 Correct 315 ms 19268 KB Output is correct
101 Correct 304 ms 19220 KB Output is correct
102 Correct 300 ms 19292 KB Output is correct
103 Correct 320 ms 18816 KB Output is correct
104 Correct 262 ms 18632 KB Output is correct
105 Correct 298 ms 18908 KB Output is correct
106 Correct 224 ms 16896 KB Output is correct
107 Correct 287 ms 19256 KB Output is correct
108 Correct 247 ms 14652 KB Output is correct
109 Correct 179 ms 14596 KB Output is correct
110 Correct 306 ms 19272 KB Output is correct
111 Correct 297 ms 19168 KB Output is correct