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Submission #240615

# Submission time Handle Problem Language Result Execution time Memory
240615 2020-06-20T09:22:57 Z mhy908 Feast (NOI19_feast) C++14
100 / 100
 176 ms 12408 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long LL;
typedef pair<LL, LL> pll;
const LL llinf=10000000000000;

int n, k;
LL arr[300010], dp[300010][2], cnt[300010][2];

int solve(LL x){
    dp[0][0]=-llinf;
    dp[0][1]=0;
    for(int i=1; i<=n; i++){
        if(dp[i-1][0]>dp[i-1][1]-x)dp[i][0]=dp[i-1][0]+arr[i], cnt[i][0]=cnt[i-1][0];
        else dp[i][0]=dp[i-1][1]+arr[i]-x, cnt[i][0]=cnt[i-1][1]+1;
        if(pll(dp[i-1][0], -cnt[i-1][0])>pll(dp[i-1][1], -cnt[i-1][1]))dp[i][1]=dp[i-1][0], cnt[i][1]=cnt[i-1][0];
        else dp[i][1]=dp[i-1][1], cnt[i][1]=cnt[i-1][1];
    }
    if(pll(dp[n][0], -cnt[n][0])>pll(dp[n][1], -cnt[n][1]))return cnt[n][0];
    return cnt[n][1];
}

int main(){
    scanf("%d %d", &n, &k);
    for(int i=1; i<=n; i++){
        scanf("%lld", &arr[i]);
        arr[i]*=2;
    }
    LL l=0, r=llinf;
    while(l<r){
        LL mid=(l+r)/2;
        if(solve(mid*2+1)>=k)l=mid+1;
        else r=mid;
    }
    solve(l*2);
    printf("%lld", max(dp[n][0], dp[n][1])/2+l*k);
}

Compilation message

feast.cpp: In function 'int main()':
feast.cpp:24:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &k);
     ~~~~~^~~~~~~~~~~~~~~~~
feast.cpp:26:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld", &arr[i]);
         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 106 ms 11896 KB Output is correct
2 Correct 108 ms 12024 KB Output is correct
3 Correct 111 ms 12152 KB Output is correct
4 Correct 119 ms 12152 KB Output is correct
5 Correct 109 ms 12152 KB Output is correct
6 Correct 112 ms 11896 KB Output is correct
7 Correct 106 ms 11896 KB Output is correct
8 Correct 122 ms 12280 KB Output is correct
9 Correct 108 ms 11960 KB Output is correct
10 Correct 115 ms 12024 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 92 ms 12044 KB Output is correct
2 Correct 91 ms 12280 KB Output is correct
3 Correct 88 ms 12024 KB Output is correct
4 Correct 89 ms 12152 KB Output is correct
5 Correct 112 ms 12024 KB Output is correct
6 Correct 86 ms 12024 KB Output is correct
7 Correct 95 ms 12408 KB Output is correct
8 Correct 117 ms 12284 KB Output is correct
9 Correct 112 ms 12024 KB Output is correct
10 Correct 90 ms 12280 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 134 ms 12152 KB Output is correct
2 Correct 130 ms 12024 KB Output is correct
3 Correct 131 ms 12280 KB Output is correct
4 Correct 127 ms 12024 KB Output is correct
5 Correct 126 ms 12152 KB Output is correct
6 Correct 128 ms 12152 KB Output is correct
7 Correct 130 ms 12308 KB Output is correct
8 Correct 126 ms 12152 KB Output is correct
9 Correct 130 ms 12280 KB Output is correct
10 Correct 134 ms 12280 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 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 4 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 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 4 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 5 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 384 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 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 4 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 5 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 384 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 6 ms 512 KB Output is correct
23 Correct 5 ms 384 KB Output is correct
24 Correct 6 ms 416 KB Output is correct
25 Correct 6 ms 384 KB Output is correct
26 Correct 5 ms 384 KB Output is correct
27 Correct 5 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 106 ms 11896 KB Output is correct
2 Correct 108 ms 12024 KB Output is correct
3 Correct 111 ms 12152 KB Output is correct
4 Correct 119 ms 12152 KB Output is correct
5 Correct 109 ms 12152 KB Output is correct
6 Correct 112 ms 11896 KB Output is correct
7 Correct 106 ms 11896 KB Output is correct
8 Correct 122 ms 12280 KB Output is correct
9 Correct 108 ms 11960 KB Output is correct
10 Correct 115 ms 12024 KB Output is correct
11 Correct 92 ms 12044 KB Output is correct
12 Correct 91 ms 12280 KB Output is correct
13 Correct 88 ms 12024 KB Output is correct
14 Correct 89 ms 12152 KB Output is correct
15 Correct 112 ms 12024 KB Output is correct
16 Correct 86 ms 12024 KB Output is correct
17 Correct 95 ms 12408 KB Output is correct
18 Correct 117 ms 12284 KB Output is correct
19 Correct 112 ms 12024 KB Output is correct
20 Correct 90 ms 12280 KB Output is correct
21 Correct 134 ms 12152 KB Output is correct
22 Correct 130 ms 12024 KB Output is correct
23 Correct 131 ms 12280 KB Output is correct
24 Correct 127 ms 12024 KB Output is correct
25 Correct 126 ms 12152 KB Output is correct
26 Correct 128 ms 12152 KB Output is correct
27 Correct 130 ms 12308 KB Output is correct
28 Correct 126 ms 12152 KB Output is correct
29 Correct 130 ms 12280 KB Output is correct
30 Correct 134 ms 12280 KB Output is correct
31 Correct 5 ms 384 KB Output is correct
32 Correct 5 ms 384 KB Output is correct
33 Correct 5 ms 384 KB Output is correct
34 Correct 5 ms 384 KB Output is correct
35 Correct 4 ms 384 KB Output is correct
36 Correct 4 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 5 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 384 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 6 ms 512 KB Output is correct
53 Correct 5 ms 384 KB Output is correct
54 Correct 6 ms 416 KB Output is correct
55 Correct 6 ms 384 KB Output is correct
56 Correct 5 ms 384 KB Output is correct
57 Correct 5 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 176 ms 12152 KB Output is correct
62 Correct 167 ms 12280 KB Output is correct
63 Correct 145 ms 12024 KB Output is correct
64 Correct 176 ms 12280 KB Output is correct
65 Correct 172 ms 12280 KB Output is correct
66 Correct 172 ms 12152 KB Output is correct
67 Correct 169 ms 12024 KB Output is correct
68 Correct 137 ms 12280 KB Output is correct
69 Correct 126 ms 12032 KB Output is correct
70 Correct 129 ms 12024 KB Output is correct