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Submission #534398

# Submission time Handle Problem Language Result Execution time Memory
534398 2022-03-08T06:31:40 Z idas Feast (NOI19_feast) C++11
12 / 100
 101 ms 9700 KB 
#include <bits/stdc++.h>
#define FOR(i, begin, end) for(int i = (begin); i < (end); i++)
#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr); cout.tie(nullptr)
#define f first
#define s second
#define pb push_back
#define sz(x) ((int)((x).size()))
#define le(vec) vec[vec.size()-1]
#define all(x) (x).begin(), (x).end()
#define TSTS int ttt; cin >> ttt; while(ttt--) solve()

using namespace std;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef pair<long double, long double> pdd;
typedef map<int, int> mii;
typedef vector<int> vi;
typedef long double ld;
typedef long long ll;

const int INF=1e9, MOD=1e9+7, mod=998244353;
const ll LINF=1e18;

void setIO()
{
    FAST_IO;
}

void setIO(string s)
{
    FAST_IO;
    freopen((s+".in").c_str(), "r", stdin);
    freopen((s+".out").c_str(), "w", stdout);
}

const int N=3e5+10;
int n, k;
ll a[N], p[N];
pair<ll, int> dp[N];

bool can(ll x)
{
    FOR(i, 0, n+1) dp[i]={0,0};
    pair<ll, int> best={0,0};
    FOR(i, 1, n+1)
    {
        dp[i]=max(dp[i-1], {best.f-x+p[i],best.s-1});
        best=max(best, {dp[i].f-p[i],dp[i].s});
    }
    return -dp[n].s<=k;
}

ll build(ll x)
{
    FOR(i, 0, n+1) dp[i]={0,0};
    pair<ll, int> best={0,0};
    FOR(i, 1, n+1)
    {
        dp[i]=max(dp[i-1], {best.f-x+p[i],best.s-1});
        best=max(best, {dp[i].f-p[i],dp[i].s});
    }
    return dp[n].f-dp[n].s*x;
}

int  main()
{
    setIO();
    cin >> n >> k;
    FOR(i, 1, n+1) cin >> a[i];
    FOR(i, 1, n+1) p[i]=p[i-1]+a[i];

    int l=0, r=INF;
    while(l<r){
        int m=(l+r)/2;
        if(can(m)) r=m;
        else l=m+1;
    }

    cout << build(l);
}

Compilation message

feast.cpp: In function 'void setIO(std::string)':
feast.cpp:32:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     freopen((s+".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
feast.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     freopen((s+".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 59 ms 9304 KB Output is correct
2 Correct 55 ms 9576 KB Output is correct
3 Correct 62 ms 9592 KB Output is correct
4 Correct 52 ms 9628 KB Output is correct
5 Correct 52 ms 9548 KB Output is correct
6 Correct 51 ms 9292 KB Output is correct
7 Correct 52 ms 9412 KB Output is correct
8 Correct 55 ms 9560 KB Output is correct
9 Correct 50 ms 9428 KB Output is correct
10 Correct 50 ms 9488 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 53 ms 9456 KB Output is correct
2 Correct 48 ms 9672 KB Output is correct
3 Correct 53 ms 9356 KB Output is correct
4 Correct 50 ms 9540 KB Output is correct
5 Correct 57 ms 9416 KB Output is correct
6 Correct 43 ms 9440 KB Output is correct
7 Correct 43 ms 9700 KB Output is correct
8 Correct 52 ms 9584 KB Output is correct
9 Correct 51 ms 9288 KB Output is correct
10 Correct 47 ms 9548 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 101 ms 9592 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 59 ms 9304 KB Output is correct
2 Correct 55 ms 9576 KB Output is correct
3 Correct 62 ms 9592 KB Output is correct
4 Correct 52 ms 9628 KB Output is correct
5 Correct 52 ms 9548 KB Output is correct
6 Correct 51 ms 9292 KB Output is correct
7 Correct 52 ms 9412 KB Output is correct
8 Correct 55 ms 9560 KB Output is correct
9 Correct 50 ms 9428 KB Output is correct
10 Correct 50 ms 9488 KB Output is correct
11 Correct 53 ms 9456 KB Output is correct
12 Correct 48 ms 9672 KB Output is correct
13 Correct 53 ms 9356 KB Output is correct
14 Correct 50 ms 9540 KB Output is correct
15 Correct 57 ms 9416 KB Output is correct
16 Correct 43 ms 9440 KB Output is correct
17 Correct 43 ms 9700 KB Output is correct
18 Correct 52 ms 9584 KB Output is correct
19 Correct 51 ms 9288 KB Output is correct
20 Correct 47 ms 9548 KB Output is correct
21 Incorrect 101 ms 9592 KB Output isn't correct
22 Halted 0 ms 0 KB -