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Submission #240605

# Submission time Handle Problem Language Result Execution time Memory
240605 2020-06-20T09:11:31 Z mhy908 Feast (NOI19_feast) C++14
4 / 100
 172 ms 12336 KB 
#include <bits/stdc++.h>
#define eb emplace_back
#define mp make_pair
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define svec(x) sort(x.begin(), x.end())
#define press(x) x.erase(unique(x.begin(), x.end()), x.end())
#define lb(x, v) lower_bound(x.begin(), x.end(), v)
#define ub(x, v) upper_bound(x.begin(), x.end(), v)
using namespace std;
typedef long long LL;
typedef pair<int, int> pii;
typedef pair<LL, LL> pll;
typedef pair<int, LL> pil;
typedef pair<LL, int> pli;
const LL llinf=10000000000000;
const LL mod1=1000000007;
const LL mod2=998244353;
const int inf=2000000000;

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;
        tie(dp[i][1], cnt[i][1])=max(tie(dp[i-1][0], cnt[i][0]), tie(dp[i-1][1], cnt[i][1]));
    }
    if(dp[n][0]>dp[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:38:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &k);
     ~~~~~^~~~~~~~~~~~~~~~~
feast.cpp:40:14: 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 114 ms 12028 KB Output is correct
2 Correct 115 ms 12152 KB Output is correct
3 Correct 114 ms 12336 KB Output is correct
4 Correct 112 ms 12280 KB Output is correct
5 Correct 114 ms 12152 KB Output is correct
6 Correct 109 ms 11900 KB Output is correct
7 Correct 109 ms 11940 KB Output is correct
8 Correct 116 ms 12280 KB Output is correct
9 Correct 109 ms 12024 KB Output is correct
10 Correct 111 ms 12152 KB Output is correct

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 97 ms 12024 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 172 ms 12232 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 114 ms 12028 KB Output is correct
2 Correct 115 ms 12152 KB Output is correct
3 Correct 114 ms 12336 KB Output is correct
4 Correct 112 ms 12280 KB Output is correct
5 Correct 114 ms 12152 KB Output is correct
6 Correct 109 ms 11900 KB Output is correct
7 Correct 109 ms 11940 KB Output is correct
8 Correct 116 ms 12280 KB Output is correct
9 Correct 109 ms 12024 KB Output is correct
10 Correct 111 ms 12152 KB Output is correct
11 Incorrect 97 ms 12024 KB Output isn't correct
12 Halted 0 ms 0 KB -