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Submission #420623

# Submission time Handle Problem Language Result Execution time Memory
420623 2021-06-08T13:00:46 Z Nicholas_Patrick Cigle (COI21_cigle) C++17
100 / 100
 908 ms 98524 KB 
#pragma GCC optimize("O3")
#include <cstdio>
#include <queue>
#include <algorithm>
using namespace std;
 
int main(){
	int n;
	scanf("%d", &n);
	vector<int> d(n);
	for(int& i : d)
		scanf("%d", &i);
	vector<vector<int>> dp(n, vector<int>(n, 0));
	/*
		dp[x][y]
		x: last brick laid
		y: earliest brick in last row
		y≤x
	*/
	for(int i=1; i<n; i++){
		vector<int> suffsum, prefsum;
		for(int j=i; j--;){
			if(suffsum.empty()){
				suffsum.push_back(d[j]);
			}else{
				suffsum.push_back(d[j]+suffsum.back());
			}
		}
		for(int j=i; j<n; j++){
			if(prefsum.empty()){
				prefsum.push_back(d[j]);
			}else{
				prefsum.push_back(d[j]+prefsum.back());
			}
		}
		for(int j=0, k=0, matches=0; j<prefsum.size(); j++){
			while(k+1<suffsum.size() and suffsum[k]<prefsum[j])
				k++;
			if(prefsum[j]==suffsum[k]){
				matches++;
				if(i+j+1<n and i-k-2>=0)
					dp[i+j+1][i]=max(dp[i+j+1][i], dp[i-1][i-k-2]+matches);
			}
		}
		if(i){
			for(int j=0; j<n; j++)
				dp[j][i]=max(dp[j][i-1], dp[j][i]);
		}
		for(int j=1; j<n; j++)
			dp[j][i]=max(dp[j][i], dp[j-1][i]);
	}
	printf("%d\n", dp[n-1][n-1]);
}

Compilation message

cigle.cpp: In function 'int main()':
cigle.cpp:36:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |   for(int j=0, k=0, matches=0; j<prefsum.size(); j++){
      |                                ~^~~~~~~~~~~~~~~
cigle.cpp:37:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |    while(k+1<suffsum.size() and suffsum[k]<prefsum[j])
      |          ~~~^~~~~~~~~~~~~~~
cigle.cpp:9:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
cigle.cpp:12:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |   scanf("%d", &i);
      |   ~~~~~^~~~~~~~~~

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 1228 KB Output is correct
2 Correct 4 ms 1228 KB Output is correct
3 Correct 4 ms 1288 KB Output is correct
4 Correct 4 ms 1228 KB Output is correct
5 Correct 4 ms 1228 KB Output is correct
6 Correct 5 ms 1228 KB Output is correct
7 Correct 5 ms 1228 KB Output is correct
8 Correct 5 ms 1228 KB Output is correct
9 Correct 6 ms 1228 KB Output is correct
10 Correct 4 ms 1228 KB Output is correct
11 Correct 4 ms 1228 KB Output is correct
12 Correct 4 ms 1228 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 4 ms 1228 KB Output is correct
22 Correct 4 ms 1228 KB Output is correct
23 Correct 4 ms 1288 KB Output is correct
24 Correct 4 ms 1228 KB Output is correct
25 Correct 4 ms 1228 KB Output is correct
26 Correct 5 ms 1228 KB Output is correct
27 Correct 5 ms 1228 KB Output is correct
28 Correct 5 ms 1228 KB Output is correct
29 Correct 6 ms 1228 KB Output is correct
30 Correct 4 ms 1228 KB Output is correct
31 Correct 4 ms 1228 KB Output is correct
32 Correct 4 ms 1228 KB Output is correct
33 Correct 4 ms 1228 KB Output is correct
34 Correct 4 ms 1228 KB Output is correct
35 Correct 4 ms 1228 KB Output is correct
36 Correct 4 ms 1228 KB Output is correct
37 Correct 5 ms 1228 KB Output is correct
38 Correct 5 ms 1228 KB Output is correct
39 Correct 5 ms 1228 KB Output is correct
40 Correct 4 ms 1228 KB Output is correct
41 Correct 4 ms 1228 KB Output is correct
42 Correct 4 ms 1228 KB Output is correct
43 Correct 4 ms 1228 KB Output is correct
44 Correct 4 ms 1228 KB Output is correct
45 Correct 4 ms 1228 KB Output is correct
46 Correct 4 ms 1228 KB Output is correct
47 Correct 4 ms 1228 KB Output is correct
48 Correct 4 ms 1228 KB Output is correct
49 Correct 4 ms 1228 KB Output is correct

Subtask #5
52.0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Correct 1 ms 204 KB Output is correct
21 Correct 4 ms 1228 KB Output is correct
22 Correct 4 ms 1228 KB Output is correct
23 Correct 4 ms 1288 KB Output is correct
24 Correct 4 ms 1228 KB Output is correct
25 Correct 4 ms 1228 KB Output is correct
26 Correct 5 ms 1228 KB Output is correct
27 Correct 5 ms 1228 KB Output is correct
28 Correct 5 ms 1228 KB Output is correct
29 Correct 6 ms 1228 KB Output is correct
30 Correct 4 ms 1228 KB Output is correct
31 Correct 4 ms 1228 KB Output is correct
32 Correct 4 ms 1228 KB Output is correct
33 Correct 4 ms 1228 KB Output is correct
34 Correct 4 ms 1228 KB Output is correct
35 Correct 4 ms 1228 KB Output is correct
36 Correct 4 ms 1228 KB Output is correct
37 Correct 5 ms 1228 KB Output is correct
38 Correct 5 ms 1228 KB Output is correct
39 Correct 5 ms 1228 KB Output is correct
40 Correct 4 ms 1228 KB Output is correct
41 Correct 4 ms 1228 KB Output is correct
42 Correct 4 ms 1228 KB Output is correct
43 Correct 4 ms 1228 KB Output is correct
44 Correct 4 ms 1228 KB Output is correct
45 Correct 4 ms 1228 KB Output is correct
46 Correct 4 ms 1228 KB Output is correct
47 Correct 4 ms 1228 KB Output is correct
48 Correct 4 ms 1228 KB Output is correct
49 Correct 4 ms 1228 KB Output is correct
50 Correct 861 ms 98412 KB Output is correct
51 Correct 842 ms 98400 KB Output is correct
52 Correct 861 ms 98396 KB Output is correct
53 Correct 847 ms 98400 KB Output is correct
54 Correct 864 ms 98400 KB Output is correct
55 Correct 878 ms 98396 KB Output is correct
56 Correct 902 ms 98400 KB Output is correct
57 Correct 908 ms 98396 KB Output is correct
58 Correct 859 ms 98400 KB Output is correct
59 Correct 856 ms 98392 KB Output is correct
60 Correct 846 ms 98368 KB Output is correct
61 Correct 834 ms 98412 KB Output is correct
62 Correct 799 ms 98360 KB Output is correct
63 Correct 832 ms 98408 KB Output is correct
64 Correct 794 ms 98408 KB Output is correct
65 Correct 804 ms 98408 KB Output is correct
66 Correct 820 ms 98408 KB Output is correct
67 Correct 818 ms 98524 KB Output is correct
68 Correct 798 ms 98408 KB Output is correct
69 Correct 805 ms 98404 KB Output is correct
70 Correct 826 ms 98400 KB Output is correct
71 Correct 809 ms 98396 KB Output is correct
72 Correct 797 ms 98404 KB Output is correct