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Submission #240565

# Submission time Handle Problem Language Result Execution time Memory
240565 2020-06-20T05:00:04 Z arnold518 Feast (NOI19_feast) C++14
100 / 100
 175 ms 15224 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 3e5;
const ll INF = 1e13;

int N, K;
ll A[MAXN+10];

pll dp1[MAXN+10], dp2[MAXN+10];
ll ans;

int solve(ll lambda)
{
	int i, j;

	dp1[0]={-INF, 0};
	dp2[0]={0, 0};
	for(i=1; i<=N; i++)
	{
		if(dp1[i-1].first>dp2[i-1].first-lambda) dp1[i]={dp1[i-1].first+A[i]*2, dp1[i-1].second};
		else dp1[i]={dp2[i-1].first-lambda+A[i]*2, dp2[i-1].second+1};
		dp2[i]=max(dp1[i-1], dp2[i-1]);
	}
	ans=max(dp1[N].first, dp2[N].first);
	if(dp1[N].first>dp2[N].first) return dp1[N].second;
	else return dp2[N].second;
}

int main()
{
	int i, j;

	scanf("%d%d", &N, &K);
	for(i=1; i<=N; i++) scanf("%lld", &A[i]);

	ll lo=0, hi=INF;
	while(lo+1<hi)
	{
		ll mid=lo+hi>>1;
		if(solve(mid*2+1)>=K) lo=mid;
		else hi=mid;
	}
	solve(lo*2);
	printf("%lld\n", ans/2+lo*K);
}

Compilation message

feast.cpp: In function 'int solve(ll)':
feast.cpp:19:9: warning: unused variable 'j' [-Wunused-variable]
  int i, j;
         ^
feast.cpp: In function 'int main()':
feast.cpp:44:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll mid=lo+hi>>1;
          ~~^~~
feast.cpp:36:9: warning: unused variable 'j' [-Wunused-variable]
  int i, j;
         ^
feast.cpp:38:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &N, &K);
  ~~~~~^~~~~~~~~~~~~~~~
feast.cpp:39:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(i=1; i<=N; i++) scanf("%lld", &A[i]);
                      ~~~~~^~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 112 ms 14584 KB Output is correct
2 Correct 116 ms 14712 KB Output is correct
3 Correct 123 ms 14856 KB Output is correct
4 Correct 115 ms 14840 KB Output is correct
5 Correct 116 ms 14712 KB Output is correct
6 Correct 116 ms 14456 KB Output is correct
7 Correct 114 ms 14456 KB Output is correct
8 Correct 115 ms 14840 KB Output is correct
9 Correct 124 ms 14588 KB Output is correct
10 Correct 126 ms 14796 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 95 ms 12920 KB Output is correct
2 Correct 105 ms 13304 KB Output is correct
3 Correct 97 ms 13048 KB Output is correct
4 Correct 99 ms 13048 KB Output is correct
5 Correct 121 ms 14456 KB Output is correct
6 Correct 101 ms 12912 KB Output is correct
7 Correct 104 ms 13176 KB Output is correct
8 Correct 126 ms 14840 KB Output is correct
9 Correct 122 ms 14456 KB Output is correct
10 Correct 109 ms 13048 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 140 ms 15096 KB Output is correct
2 Correct 141 ms 14712 KB Output is correct
3 Correct 136 ms 14968 KB Output is correct
4 Correct 127 ms 14712 KB Output is correct
5 Correct 134 ms 14992 KB Output is correct
6 Correct 138 ms 15048 KB Output is correct
7 Correct 131 ms 15096 KB Output is correct
8 Correct 128 ms 14840 KB Output is correct
9 Correct 135 ms 15096 KB Output is correct
10 Correct 131 ms 15096 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 4 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct

Subtask #5
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 4 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 5 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 6 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct
16 Correct 5 ms 384 KB Output is correct
17 Correct 5 ms 372 KB Output is correct
18 Correct 5 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 384 KB Output is correct

Subtask #6
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 4 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 5 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 6 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct
16 Correct 5 ms 384 KB Output is correct
17 Correct 5 ms 372 KB Output is correct
18 Correct 5 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 5 ms 384 KB Output is correct
21 Correct 6 ms 384 KB Output is correct
22 Correct 5 ms 384 KB Output is correct
23 Correct 5 ms 384 KB Output is correct
24 Correct 6 ms 512 KB Output is correct
25 Correct 5 ms 384 KB Output is correct
26 Correct 5 ms 384 KB Output is correct
27 Correct 6 ms 384 KB Output is correct
28 Correct 5 ms 384 KB Output is correct
29 Correct 5 ms 384 KB Output is correct
30 Correct 5 ms 384 KB Output is correct

Subtask #7
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 112 ms 14584 KB Output is correct
2 Correct 116 ms 14712 KB Output is correct
3 Correct 123 ms 14856 KB Output is correct
4 Correct 115 ms 14840 KB Output is correct
5 Correct 116 ms 14712 KB Output is correct
6 Correct 116 ms 14456 KB Output is correct
7 Correct 114 ms 14456 KB Output is correct
8 Correct 115 ms 14840 KB Output is correct
9 Correct 124 ms 14588 KB Output is correct
10 Correct 126 ms 14796 KB Output is correct
11 Correct 95 ms 12920 KB Output is correct
12 Correct 105 ms 13304 KB Output is correct
13 Correct 97 ms 13048 KB Output is correct
14 Correct 99 ms 13048 KB Output is correct
15 Correct 121 ms 14456 KB Output is correct
16 Correct 101 ms 12912 KB Output is correct
17 Correct 104 ms 13176 KB Output is correct
18 Correct 126 ms 14840 KB Output is correct
19 Correct 122 ms 14456 KB Output is correct
20 Correct 109 ms 13048 KB Output is correct
21 Correct 140 ms 15096 KB Output is correct
22 Correct 141 ms 14712 KB Output is correct
23 Correct 136 ms 14968 KB Output is correct
24 Correct 127 ms 14712 KB Output is correct
25 Correct 134 ms 14992 KB Output is correct
26 Correct 138 ms 15048 KB Output is correct
27 Correct 131 ms 15096 KB Output is correct
28 Correct 128 ms 14840 KB Output is correct
29 Correct 135 ms 15096 KB Output is correct
30 Correct 131 ms 15096 KB Output is correct
31 Correct 5 ms 384 KB Output is correct
32 Correct 5 ms 384 KB Output is correct
33 Correct 4 ms 384 KB Output is correct
34 Correct 5 ms 384 KB Output is correct
35 Correct 5 ms 384 KB Output is correct
36 Correct 5 ms 384 KB Output is correct
37 Correct 5 ms 384 KB Output is correct
38 Correct 5 ms 384 KB Output is correct
39 Correct 5 ms 384 KB Output is correct
40 Correct 4 ms 384 KB Output is correct
41 Correct 5 ms 384 KB Output is correct
42 Correct 5 ms 384 KB Output is correct
43 Correct 5 ms 384 KB Output is correct
44 Correct 6 ms 384 KB Output is correct
45 Correct 5 ms 384 KB Output is correct
46 Correct 5 ms 384 KB Output is correct
47 Correct 5 ms 372 KB Output is correct
48 Correct 5 ms 384 KB Output is correct
49 Correct 5 ms 384 KB Output is correct
50 Correct 5 ms 384 KB Output is correct
51 Correct 6 ms 384 KB Output is correct
52 Correct 5 ms 384 KB Output is correct
53 Correct 5 ms 384 KB Output is correct
54 Correct 6 ms 512 KB Output is correct
55 Correct 5 ms 384 KB Output is correct
56 Correct 5 ms 384 KB Output is correct
57 Correct 6 ms 384 KB Output is correct
58 Correct 5 ms 384 KB Output is correct
59 Correct 5 ms 384 KB Output is correct
60 Correct 5 ms 384 KB Output is correct
61 Correct 168 ms 14840 KB Output is correct
62 Correct 158 ms 15224 KB Output is correct
63 Correct 143 ms 14688 KB Output is correct
64 Correct 171 ms 15224 KB Output is correct
65 Correct 175 ms 14968 KB Output is correct
66 Correct 171 ms 14968 KB Output is correct
67 Correct 169 ms 14712 KB Output is correct
68 Correct 132 ms 15148 KB Output is correct
69 Correct 131 ms 14712 KB Output is correct
70 Correct 129 ms 14712 KB Output is correct