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Submission #577679

# Submission time Handle Problem Language Result Execution time Memory
577679 2022-06-15T08:01:10 Z kingfran1907 Event Hopping (BOI22_events) C++14
100 / 100
 429 ms 333436 KB 
#include <bits/stdc++.h>
#define X first
#define Y second

using namespace std;

const int maxn = 2e5+10;
const int inf = 0x3f3f3f3f;
const int logo = 20;
const int off = 1 << logo;
const int treesiz = off << 1;

int n, q;
pair<int, int> s[maxn];
vector< int > v;
int dp[30][maxn];
int mini[maxn];
int rmq[logo][logo][maxn];
int pot[maxn];

int query(int ind, int a, int b) {
	int len = b - a + 1;
	int ac = pot[len];
	
	return min(rmq[ind][ac][a], rmq[ind][ac][b - (1 << ac) + 1]);
}

int main() {
	scanf("%d%d", &n, &q);
	for (int i = 0; i < n; i++) {
		int a, b;
		scanf("%d%d", &a, &b);
		s[i] = {a, b};
		v.push_back(a);
		v.push_back(b);
	}
	
	pot[1] = 0;
	for (int i = 2; i < maxn; i++) {
		pot[i] = pot[i - 1];
		if ((i & (i - 1)) == 0) pot[i]++;
	}
	
	sort(v.begin(), v.end());
	v.resize(unique(v.begin(), v.end()) - v.begin());
	for (int i = 0; i < v.size(); i++) mini[i] = i;
	for (int i = 0; i < n; i++) {
		s[i].X = lower_bound(v.begin(), v.end(), s[i].X) - v.begin();
		s[i].Y = lower_bound(v.begin(), v.end(), s[i].Y) - v.begin();
		mini[s[i].Y] = min(mini[s[i].Y], s[i].X);
	}
	
	for (int i = 0; i < v.size(); i++) {
		dp[0][i] = mini[i];
		//printf("mini %d --> %d\n", i, mini[i]);
	}
	
	memset(rmq, inf, sizeof rmq);
	for (int i = 1; i < logo; i++) {
		for (int j = 0; j < v.size(); j++) rmq[i - 1][0][j] = dp[i - 1][j];
		for (int j = 1; j < logo; j++)
			for (int k = 0; k < v.size(); k++)
				rmq[i - 1][j][k] = min(rmq[i - 1][j - 1][k], rmq[i - 1][j - 1][k + (1 << (j - 1))]);
		
		for (int j = 0; j < v.size(); j++) {
			dp[i][j] = query(i - 1, dp[i - 1][j], j);
		}
	}
	for (int j = 0; j < v.size(); j++) rmq[logo - 1][0][j] = dp[logo - 1][j];
	for (int j = 1; j < logo; j++)
		for (int k = 0; k < v.size(); k++)
			rmq[logo - 1][j][k] = min(rmq[logo - 1][j - 1][k], rmq[logo - 1][j - 1][k + (1 << (j - 1))]);
	
	while (q--) {
		int a, b;
		scanf("%d%d", &a, &b); a--, b--;
		if (s[a].Y > s[b].Y) {
			printf("impossible\n");
			continue;
		}
		if (a == b) {
			printf("0\n");
			continue;
		}
		int ca = a, cb = b;
		
		int sol = inf;
		/*int dis = 0;
		b = s[b].Y;
		a = s[a].Y;
		for (int i = logo - 1; i >= 0; i--) {
			if (dp[i][b] > a) b = dp[i][b], dis += (1 << i);
			//printf("debug: %d %d\n", a, b);
		}
		if (mini[b] <= a)
			sol = min(sol, dis + 2);
		else {
			printf("impossible\n");
			continue;
		}*/
		
		int dis = 0;
		b = s[cb].Y;
		int l = s[cb].X;
		a = s[ca].Y;
		for (int i = logo - 1; i >= 0; i--) {
			int tren = query(i, l, b);
			if (tren > a) l = tren, dis += (1 << i);
			//printf("debug: %d %d %d\n", a, l, b);
		}
		if (l <= a) sol = min(sol, dis + 1);
		if (query(0, l, b) <= a) sol = min(dis + 2, sol);
		if (sol >= inf) printf("impossible\n");
		else printf("%d\n", sol);
	}
	return 0;
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:46:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |  for (int i = 0; i < v.size(); i++) mini[i] = i;
      |                  ~~^~~~~~~~~~
events.cpp:53:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |  for (int i = 0; i < v.size(); i++) {
      |                  ~~^~~~~~~~~~
events.cpp:60:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |   for (int j = 0; j < v.size(); j++) rmq[i - 1][0][j] = dp[i - 1][j];
      |                   ~~^~~~~~~~~~
events.cpp:62:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |    for (int k = 0; k < v.size(); k++)
      |                    ~~^~~~~~~~~~
events.cpp:65:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |   for (int j = 0; j < v.size(); j++) {
      |                   ~~^~~~~~~~~~
events.cpp:69:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   69 |  for (int j = 0; j < v.size(); j++) rmq[logo - 1][0][j] = dp[logo - 1][j];
      |                  ~~^~~~~~~~~~
events.cpp:71:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |   for (int k = 0; k < v.size(); k++)
      |                   ~~^~~~~~~~~~
events.cpp:29:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |  scanf("%d%d", &n, &q);
      |  ~~~~~^~~~~~~~~~~~~~~~
events.cpp:32:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |   scanf("%d%d", &a, &b);
      |   ~~~~~^~~~~~~~~~~~~~~~
events.cpp:76:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |   scanf("%d%d", &a, &b); a--, b--;
      |   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 132 ms 314304 KB Output is correct
2 Correct 265 ms 324812 KB Output is correct
3 Correct 261 ms 324880 KB Output is correct
4 Correct 320 ms 324700 KB Output is correct
5 Correct 290 ms 325588 KB Output is correct
6 Correct 299 ms 326368 KB Output is correct
7 Correct 287 ms 326720 KB Output is correct
8 Correct 340 ms 333352 KB Output is correct
9 Correct 363 ms 333364 KB Output is correct
10 Correct 335 ms 325084 KB Output is correct
11 Correct 410 ms 328388 KB Output is correct
12 Correct 293 ms 325316 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 121 ms 314316 KB Output is correct
2 Correct 118 ms 314208 KB Output is correct
3 Correct 133 ms 314328 KB Output is correct
4 Correct 127 ms 314392 KB Output is correct
5 Correct 125 ms 314444 KB Output is correct
6 Correct 123 ms 314380 KB Output is correct
7 Correct 138 ms 314464 KB Output is correct
8 Correct 128 ms 314392 KB Output is correct
9 Correct 126 ms 314268 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 121 ms 314316 KB Output is correct
2 Correct 118 ms 314208 KB Output is correct
3 Correct 133 ms 314328 KB Output is correct
4 Correct 127 ms 314392 KB Output is correct
5 Correct 125 ms 314444 KB Output is correct
6 Correct 123 ms 314380 KB Output is correct
7 Correct 138 ms 314464 KB Output is correct
8 Correct 128 ms 314392 KB Output is correct
9 Correct 126 ms 314268 KB Output is correct
10 Correct 126 ms 314336 KB Output is correct
11 Correct 130 ms 314308 KB Output is correct
12 Correct 138 ms 314332 KB Output is correct
13 Correct 119 ms 314352 KB Output is correct
14 Correct 130 ms 314396 KB Output is correct
15 Correct 124 ms 314320 KB Output is correct
16 Correct 119 ms 314376 KB Output is correct
17 Correct 131 ms 314472 KB Output is correct
18 Correct 129 ms 314224 KB Output is correct
19 Correct 169 ms 315392 KB Output is correct
20 Correct 158 ms 315340 KB Output is correct
21 Correct 158 ms 315708 KB Output is correct
22 Correct 176 ms 315660 KB Output is correct
23 Correct 154 ms 315912 KB Output is correct
24 Correct 169 ms 315852 KB Output is correct
25 Correct 183 ms 315552 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 121 ms 314316 KB Output is correct
2 Correct 118 ms 314208 KB Output is correct
3 Correct 133 ms 314328 KB Output is correct
4 Correct 127 ms 314392 KB Output is correct
5 Correct 125 ms 314444 KB Output is correct
6 Correct 123 ms 314380 KB Output is correct
7 Correct 138 ms 314464 KB Output is correct
8 Correct 128 ms 314392 KB Output is correct
9 Correct 126 ms 314268 KB Output is correct
10 Correct 117 ms 314188 KB Output is correct
11 Correct 120 ms 314240 KB Output is correct
12 Correct 131 ms 314304 KB Output is correct
13 Correct 128 ms 314352 KB Output is correct
14 Correct 131 ms 314396 KB Output is correct
15 Correct 114 ms 314372 KB Output is correct
16 Correct 119 ms 314444 KB Output is correct
17 Correct 130 ms 314380 KB Output is correct
18 Correct 129 ms 314260 KB Output is correct
19 Correct 220 ms 324156 KB Output is correct
20 Correct 211 ms 324200 KB Output is correct
21 Correct 224 ms 324212 KB Output is correct
22 Correct 259 ms 327172 KB Output is correct
23 Correct 262 ms 332228 KB Output is correct
24 Correct 264 ms 332312 KB Output is correct
25 Correct 140 ms 315964 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 267 ms 324696 KB Output is correct
2 Correct 291 ms 324708 KB Output is correct
3 Correct 265 ms 324796 KB Output is correct
4 Correct 308 ms 333360 KB Output is correct
5 Correct 345 ms 325076 KB Output is correct
6 Correct 361 ms 333028 KB Output is correct
7 Correct 383 ms 332988 KB Output is correct
8 Correct 395 ms 333176 KB Output is correct
9 Correct 281 ms 332276 KB Output is correct
10 Correct 308 ms 332628 KB Output is correct
11 Correct 305 ms 332624 KB Output is correct
12 Correct 303 ms 332720 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 132 ms 314304 KB Output is correct
2 Correct 265 ms 324812 KB Output is correct
3 Correct 261 ms 324880 KB Output is correct
4 Correct 320 ms 324700 KB Output is correct
5 Correct 290 ms 325588 KB Output is correct
6 Correct 299 ms 326368 KB Output is correct
7 Correct 287 ms 326720 KB Output is correct
8 Correct 340 ms 333352 KB Output is correct
9 Correct 363 ms 333364 KB Output is correct
10 Correct 335 ms 325084 KB Output is correct
11 Correct 410 ms 328388 KB Output is correct
12 Correct 293 ms 325316 KB Output is correct
13 Correct 121 ms 314316 KB Output is correct
14 Correct 118 ms 314208 KB Output is correct
15 Correct 133 ms 314328 KB Output is correct
16 Correct 127 ms 314392 KB Output is correct
17 Correct 125 ms 314444 KB Output is correct
18 Correct 123 ms 314380 KB Output is correct
19 Correct 138 ms 314464 KB Output is correct
20 Correct 128 ms 314392 KB Output is correct
21 Correct 126 ms 314268 KB Output is correct
22 Correct 126 ms 314336 KB Output is correct
23 Correct 130 ms 314308 KB Output is correct
24 Correct 138 ms 314332 KB Output is correct
25 Correct 119 ms 314352 KB Output is correct
26 Correct 130 ms 314396 KB Output is correct
27 Correct 124 ms 314320 KB Output is correct
28 Correct 119 ms 314376 KB Output is correct
29 Correct 131 ms 314472 KB Output is correct
30 Correct 129 ms 314224 KB Output is correct
31 Correct 169 ms 315392 KB Output is correct
32 Correct 158 ms 315340 KB Output is correct
33 Correct 158 ms 315708 KB Output is correct
34 Correct 176 ms 315660 KB Output is correct
35 Correct 154 ms 315912 KB Output is correct
36 Correct 169 ms 315852 KB Output is correct
37 Correct 183 ms 315552 KB Output is correct
38 Correct 117 ms 314188 KB Output is correct
39 Correct 120 ms 314240 KB Output is correct
40 Correct 131 ms 314304 KB Output is correct
41 Correct 128 ms 314352 KB Output is correct
42 Correct 131 ms 314396 KB Output is correct
43 Correct 114 ms 314372 KB Output is correct
44 Correct 119 ms 314444 KB Output is correct
45 Correct 130 ms 314380 KB Output is correct
46 Correct 129 ms 314260 KB Output is correct
47 Correct 220 ms 324156 KB Output is correct
48 Correct 211 ms 324200 KB Output is correct
49 Correct 224 ms 324212 KB Output is correct
50 Correct 259 ms 327172 KB Output is correct
51 Correct 262 ms 332228 KB Output is correct
52 Correct 264 ms 332312 KB Output is correct
53 Correct 140 ms 315964 KB Output is correct
54 Correct 267 ms 324696 KB Output is correct
55 Correct 291 ms 324708 KB Output is correct
56 Correct 265 ms 324796 KB Output is correct
57 Correct 308 ms 333360 KB Output is correct
58 Correct 345 ms 325076 KB Output is correct
59 Correct 361 ms 333028 KB Output is correct
60 Correct 383 ms 332988 KB Output is correct
61 Correct 395 ms 333176 KB Output is correct
62 Correct 281 ms 332276 KB Output is correct
63 Correct 308 ms 332628 KB Output is correct
64 Correct 305 ms 332624 KB Output is correct
65 Correct 303 ms 332720 KB Output is correct
66 Correct 126 ms 314312 KB Output is correct
67 Correct 250 ms 324772 KB Output is correct
68 Correct 255 ms 324924 KB Output is correct
69 Correct 321 ms 324700 KB Output is correct
70 Correct 265 ms 325692 KB Output is correct
71 Correct 310 ms 326448 KB Output is correct
72 Correct 272 ms 326700 KB Output is correct
73 Correct 324 ms 333436 KB Output is correct
74 Correct 306 ms 333432 KB Output is correct
75 Correct 323 ms 325160 KB Output is correct
76 Correct 381 ms 328360 KB Output is correct
77 Correct 228 ms 325312 KB Output is correct
78 Correct 150 ms 314288 KB Output is correct
79 Correct 115 ms 314396 KB Output is correct
80 Correct 120 ms 314396 KB Output is correct
81 Correct 121 ms 314376 KB Output is correct
82 Correct 135 ms 314340 KB Output is correct
83 Correct 121 ms 314452 KB Output is correct
84 Correct 124 ms 314516 KB Output is correct
85 Correct 133 ms 314276 KB Output is correct
86 Correct 168 ms 315432 KB Output is correct
87 Correct 154 ms 315332 KB Output is correct
88 Correct 169 ms 315632 KB Output is correct
89 Correct 167 ms 315592 KB Output is correct
90 Correct 160 ms 315872 KB Output is correct
91 Correct 153 ms 315932 KB Output is correct
92 Correct 177 ms 315596 KB Output is correct
93 Correct 230 ms 324196 KB Output is correct
94 Correct 222 ms 324160 KB Output is correct
95 Correct 231 ms 324192 KB Output is correct
96 Correct 241 ms 327228 KB Output is correct
97 Correct 286 ms 332272 KB Output is correct
98 Correct 276 ms 332304 KB Output is correct
99 Correct 134 ms 315968 KB Output is correct
100 Correct 397 ms 333028 KB Output is correct
101 Correct 428 ms 332968 KB Output is correct
102 Correct 429 ms 333136 KB Output is correct
103 Correct 323 ms 332784 KB Output is correct
104 Correct 332 ms 332512 KB Output is correct
105 Correct 303 ms 332636 KB Output is correct
106 Correct 300 ms 322932 KB Output is correct
107 Correct 330 ms 324916 KB Output is correct
108 Correct 299 ms 325228 KB Output is correct
109 Correct 296 ms 325004 KB Output is correct
110 Correct 338 ms 332940 KB Output is correct
111 Correct 326 ms 332916 KB Output is correct