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Submission #549938

# Submission time Handle Problem Language Result Execution time Memory
549938 2022-04-16T21:48:22 Z LucaDantas Railway Trip (JOI17_railway_trip) C++17
100 / 100
 221 ms 18676 KB 
#include <bits/stdc++.h>
using namespace std;

constexpr int maxn = 1e5+10, logn = 20;

int a[maxn], l[maxn][logn], r[maxn][logn];

int main() {
	int n, k, q; scanf("%d %d %d", &n, &k, &q);
	for(int i = 1; i <= n; i++)
		scanf("%d", a+i);

	l[1][0] = 1;
	for(int i = 2; i <= n; i++) {
		l[i][0] = i-1;
		while(a[l[i][0]] < a[i])
			l[i][0] = l[l[i][0]][0];
	}

	r[n][0] = n;
	for(int i = n-1; i >= 1; i--) {
		r[i][0] = i+1;
		while(a[r[i][0]] < a[i])
			r[i][0] = r[r[i][0]][0];
	}

	for(int lg = 1; lg < logn; lg++) {
		for(int i = 1; i <= n; i++) {
			l[i][lg] = min(l[l[i][lg-1]][lg-1], l[r[i][lg-1]][lg-1]);
			r[i][lg] = max(r[l[i][lg-1]][lg-1], r[r[i][lg-1]][lg-1]);
		}
	}

	while(q--) {
		int x, y; scanf("%d %d", &x, &y);
		if(x > y) swap(x, y);
		int L = x, R = x, ans = 0;
		for(int lg = logn-1; lg >= 0; lg--) if(max(r[L][lg], r[R][lg]) < y) {
			ans += 1<<lg;
			tie(L, R) = make_pair(min(l[L][lg], l[R][lg]), max(r[L][lg], r[R][lg]));
		}

		x = R;
		L = y, R = y;
		for(int lg = logn-1; lg >= 0; lg--) if(min(l[L][lg], l[R][lg]) > x) {
			ans += 1<<lg;
			tie(L, R) = make_pair(min(l[L][lg], l[R][lg]), max(r[L][lg], r[R][lg]));
		}
		printf("%d\n", ans);
	}
}

Compilation message

railway_trip.cpp: In function 'int main()':
railway_trip.cpp:9:20: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |  int n, k, q; scanf("%d %d %d", &n, &k, &q);
      |               ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
railway_trip.cpp:11:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |   scanf("%d", a+i);
      |   ~~~~~^~~~~~~~~~~
railway_trip.cpp:35:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |   int x, y; scanf("%d %d", &x, &y);
      |             ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 304 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 304 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 46 ms 16536 KB Output is correct
3 Correct 48 ms 16576 KB Output is correct
4 Correct 42 ms 16596 KB Output is correct
5 Correct 50 ms 16616 KB Output is correct
6 Correct 43 ms 16724 KB Output is correct
7 Correct 44 ms 16900 KB Output is correct
8 Correct 39 ms 16460 KB Output is correct
9 Correct 50 ms 16908 KB Output is correct
10 Correct 42 ms 16708 KB Output is correct
11 Correct 49 ms 16852 KB Output is correct
12 Correct 49 ms 16912 KB Output is correct
13 Correct 49 ms 16868 KB Output is correct
14 Correct 48 ms 16844 KB Output is correct
15 Correct 49 ms 16896 KB Output is correct
16 Correct 50 ms 16872 KB Output is correct
17 Correct 45 ms 16928 KB Output is correct
18 Correct 45 ms 16844 KB Output is correct
19 Correct 45 ms 16976 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 132 ms 18188 KB Output is correct
2 Correct 144 ms 18112 KB Output is correct
3 Correct 165 ms 18116 KB Output is correct
4 Correct 128 ms 18172 KB Output is correct
5 Correct 155 ms 18136 KB Output is correct
6 Correct 147 ms 18148 KB Output is correct
7 Correct 122 ms 18124 KB Output is correct
8 Correct 173 ms 18188 KB Output is correct
9 Correct 221 ms 18168 KB Output is correct
10 Correct 200 ms 18208 KB Output is correct
11 Correct 221 ms 18360 KB Output is correct
12 Correct 196 ms 18244 KB Output is correct
13 Correct 219 ms 18228 KB Output is correct
14 Correct 187 ms 18096 KB Output is correct
15 Correct 181 ms 18076 KB Output is correct
16 Correct 147 ms 17980 KB Output is correct

Subtask #4
55.0 / 55.0

# Verdict Execution time Memory Grader output
1 Correct 122 ms 18332 KB Output is correct
2 Correct 116 ms 18240 KB Output is correct
3 Correct 125 ms 18256 KB Output is correct
4 Correct 112 ms 18244 KB Output is correct
5 Correct 207 ms 18240 KB Output is correct
6 Correct 189 ms 18588 KB Output is correct
7 Correct 168 ms 18612 KB Output is correct
8 Correct 175 ms 18448 KB Output is correct
9 Correct 205 ms 18528 KB Output is correct
10 Correct 149 ms 18552 KB Output is correct
11 Correct 157 ms 18508 KB Output is correct
12 Correct 173 ms 18544 KB Output is correct
13 Correct 165 ms 18604 KB Output is correct
14 Correct 165 ms 18676 KB Output is correct
15 Correct 177 ms 18572 KB Output is correct
16 Correct 191 ms 18528 KB Output is correct
17 Correct 165 ms 18564 KB Output is correct
18 Correct 166 ms 18508 KB Output is correct
19 Correct 166 ms 18488 KB Output is correct
20 Correct 136 ms 18360 KB Output is correct
21 Correct 126 ms 18316 KB Output is correct
22 Correct 127 ms 18384 KB Output is correct
23 Correct 127 ms 18232 KB Output is correct