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Submission #996787

# Submission time Handle Problem Language Result Execution time Memory
996787 2024-06-11T08:16:27 Z siewjh Trains (BOI24_trains) C++17
100 / 100
 164 ms 131584 KB 
#include <bits/stdc++.h>
using namespace std;
const int mod = 1e9 + 7;
const int MAXN = 100355;
int suff[350][MAXN], ans[MAXN];
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0); cout.tie(0);
	int nums; cin >> nums;
	vector<int> step(nums + 1), stop(nums + 1);
	for (int i = 1; i <= nums; i++){
		int amt; cin >> step[i] >> amt;
		if (step[i] != 0){
			amt = min(amt, (nums - i) / step[i]);
			stop[i] = i + amt * step[i];
		}
	}
	int bsz = 330;
	for (int i = nums; i >= 1; i--){
		ans[i] = 1;
		int ssz = step[i];
		if (ssz > bsz){
			for (int x = stop[i]; x > i; x -= ssz) ans[i] = (ans[i] + ans[x]) % mod;
		}
		else if (ssz != 0){
			ans[i] = (ans[i] + suff[ssz][i + ssz] - suff[ssz][stop[i] + ssz] + mod) % mod;
		}
		for (int x = 1; x <= bsz; x++) suff[x][i] = (suff[x][i + x] + ans[i]) % mod;
	}
	cout << ans[1];
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1880 KB Output is correct
2 Correct 1 ms 1884 KB Output is correct
3 Correct 1 ms 1884 KB Output is correct
4 Correct 1 ms 1884 KB Output is correct
5 Correct 1 ms 1884 KB Output is correct
6 Correct 1 ms 1884 KB Output is correct
7 Correct 1 ms 1884 KB Output is correct
8 Correct 1 ms 1884 KB Output is correct
9 Correct 3 ms 1884 KB Output is correct
10 Correct 1 ms 1884 KB Output is correct
11 Correct 1 ms 1880 KB Output is correct
12 Correct 2 ms 1884 KB Output is correct
13 Correct 1 ms 1884 KB Output is correct
14 Correct 1 ms 1884 KB Output is correct
15 Correct 1 ms 1896 KB Output is correct
16 Correct 1 ms 1880 KB Output is correct
17 Correct 2 ms 1884 KB Output is correct
18 Correct 1 ms 1884 KB Output is correct
19 Correct 2 ms 1880 KB Output is correct

Subtask #2
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1880 KB Output is correct
2 Correct 1 ms 1884 KB Output is correct
3 Correct 1 ms 1884 KB Output is correct
4 Correct 1 ms 1884 KB Output is correct
5 Correct 1 ms 1884 KB Output is correct
6 Correct 1 ms 1884 KB Output is correct
7 Correct 1 ms 1884 KB Output is correct
8 Correct 1 ms 1884 KB Output is correct
9 Correct 3 ms 1884 KB Output is correct
10 Correct 1 ms 1884 KB Output is correct
11 Correct 1 ms 1880 KB Output is correct
12 Correct 2 ms 1884 KB Output is correct
13 Correct 1 ms 1884 KB Output is correct
14 Correct 1 ms 1884 KB Output is correct
15 Correct 1 ms 1896 KB Output is correct
16 Correct 1 ms 1880 KB Output is correct
17 Correct 2 ms 1884 KB Output is correct
18 Correct 1 ms 1884 KB Output is correct
19 Correct 2 ms 1880 KB Output is correct
20 Correct 13 ms 12636 KB Output is correct
21 Correct 5 ms 5724 KB Output is correct
22 Correct 14 ms 14920 KB Output is correct
23 Correct 10 ms 10224 KB Output is correct
24 Correct 6 ms 7260 KB Output is correct
25 Correct 11 ms 13464 KB Output is correct
26 Correct 7 ms 7772 KB Output is correct
27 Correct 12 ms 12996 KB Output is correct
28 Correct 13 ms 14940 KB Output is correct
29 Correct 14 ms 14924 KB Output is correct
30 Correct 14 ms 14936 KB Output is correct
31 Correct 18 ms 14928 KB Output is correct
32 Correct 14 ms 14940 KB Output is correct
33 Correct 18 ms 14800 KB Output is correct
34 Correct 13 ms 14936 KB Output is correct
35 Correct 14 ms 14868 KB Output is correct
36 Correct 15 ms 14940 KB Output is correct

Subtask #3
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1884 KB Output is correct
2 Correct 10 ms 10264 KB Output is correct
3 Correct 8 ms 7772 KB Output is correct
4 Correct 12 ms 12952 KB Output is correct
5 Correct 88 ms 103084 KB Output is correct
6 Correct 120 ms 131408 KB Output is correct
7 Correct 123 ms 131412 KB Output is correct
8 Correct 2 ms 1884 KB Output is correct
9 Correct 1 ms 1884 KB Output is correct
10 Correct 1 ms 1884 KB Output is correct
11 Correct 15 ms 14940 KB Output is correct
12 Correct 124 ms 131408 KB Output is correct
13 Correct 1 ms 1880 KB Output is correct
14 Correct 13 ms 14792 KB Output is correct
15 Correct 127 ms 131416 KB Output is correct

Subtask #4
34.0 / 34.0

# Verdict Execution time Memory Grader output
1 Correct 62 ms 65876 KB Output is correct
2 Correct 47 ms 53840 KB Output is correct
3 Correct 158 ms 131548 KB Output is correct
4 Correct 89 ms 95824 KB Output is correct
5 Correct 1 ms 1880 KB Output is correct
6 Correct 1 ms 1880 KB Output is correct
7 Correct 14 ms 14940 KB Output is correct
8 Correct 125 ms 131412 KB Output is correct

Subtask #5
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1880 KB Output is correct
2 Correct 1 ms 1884 KB Output is correct
3 Correct 1 ms 1884 KB Output is correct
4 Correct 1 ms 1884 KB Output is correct
5 Correct 1 ms 1884 KB Output is correct
6 Correct 1 ms 1884 KB Output is correct
7 Correct 1 ms 1884 KB Output is correct
8 Correct 1 ms 1884 KB Output is correct
9 Correct 3 ms 1884 KB Output is correct
10 Correct 1 ms 1884 KB Output is correct
11 Correct 1 ms 1880 KB Output is correct
12 Correct 2 ms 1884 KB Output is correct
13 Correct 1 ms 1884 KB Output is correct
14 Correct 1 ms 1884 KB Output is correct
15 Correct 1 ms 1896 KB Output is correct
16 Correct 1 ms 1880 KB Output is correct
17 Correct 2 ms 1884 KB Output is correct
18 Correct 1 ms 1884 KB Output is correct
19 Correct 2 ms 1880 KB Output is correct
20 Correct 13 ms 12636 KB Output is correct
21 Correct 5 ms 5724 KB Output is correct
22 Correct 14 ms 14920 KB Output is correct
23 Correct 10 ms 10224 KB Output is correct
24 Correct 6 ms 7260 KB Output is correct
25 Correct 11 ms 13464 KB Output is correct
26 Correct 7 ms 7772 KB Output is correct
27 Correct 12 ms 12996 KB Output is correct
28 Correct 13 ms 14940 KB Output is correct
29 Correct 14 ms 14924 KB Output is correct
30 Correct 14 ms 14936 KB Output is correct
31 Correct 18 ms 14928 KB Output is correct
32 Correct 14 ms 14940 KB Output is correct
33 Correct 18 ms 14800 KB Output is correct
34 Correct 13 ms 14936 KB Output is correct
35 Correct 14 ms 14868 KB Output is correct
36 Correct 15 ms 14940 KB Output is correct
37 Correct 2 ms 1884 KB Output is correct
38 Correct 10 ms 10264 KB Output is correct
39 Correct 8 ms 7772 KB Output is correct
40 Correct 12 ms 12952 KB Output is correct
41 Correct 88 ms 103084 KB Output is correct
42 Correct 120 ms 131408 KB Output is correct
43 Correct 123 ms 131412 KB Output is correct
44 Correct 2 ms 1884 KB Output is correct
45 Correct 1 ms 1884 KB Output is correct
46 Correct 1 ms 1884 KB Output is correct
47 Correct 15 ms 14940 KB Output is correct
48 Correct 124 ms 131408 KB Output is correct
49 Correct 1 ms 1880 KB Output is correct
50 Correct 13 ms 14792 KB Output is correct
51 Correct 127 ms 131416 KB Output is correct
52 Correct 62 ms 65876 KB Output is correct
53 Correct 47 ms 53840 KB Output is correct
54 Correct 158 ms 131548 KB Output is correct
55 Correct 89 ms 95824 KB Output is correct
56 Correct 1 ms 1880 KB Output is correct
57 Correct 1 ms 1880 KB Output is correct
58 Correct 14 ms 14940 KB Output is correct
59 Correct 125 ms 131412 KB Output is correct
60 Correct 103 ms 110932 KB Output is correct
61 Correct 124 ms 131424 KB Output is correct
62 Correct 141 ms 131408 KB Output is correct
63 Correct 120 ms 131408 KB Output is correct
64 Correct 122 ms 131392 KB Output is correct
65 Correct 164 ms 131492 KB Output is correct
66 Correct 120 ms 131412 KB Output is correct
67 Correct 137 ms 131408 KB Output is correct
68 Correct 125 ms 131408 KB Output is correct
69 Correct 129 ms 131564 KB Output is correct
70 Correct 128 ms 131584 KB Output is correct
71 Correct 120 ms 131404 KB Output is correct
72 Correct 121 ms 131408 KB Output is correct