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Submission #534399

# Submission time Handle Problem Language Result Execution time Memory
534399 2022-03-08T06:32:31 Z idas Feast (NOI19_feast) C++11
12 / 100
 99 ms 9796 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);
}

#define int long long

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;
}

signed 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 58 ms 9288 KB Output is correct
2 Correct 57 ms 9540 KB Output is correct
3 Correct 62 ms 9612 KB Output is correct
4 Correct 56 ms 9540 KB Output is correct
5 Correct 81 ms 9456 KB Output is correct
6 Correct 59 ms 9388 KB Output is correct
7 Correct 59 ms 9356 KB Output is correct
8 Correct 61 ms 9540 KB Output is correct
9 Correct 58 ms 9428 KB Output is correct
10 Correct 62 ms 9532 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 61 ms 9428 KB Output is correct
2 Correct 50 ms 9676 KB Output is correct
3 Correct 48 ms 9420 KB Output is correct
4 Correct 48 ms 9540 KB Output is correct
5 Correct 58 ms 9412 KB Output is correct
6 Correct 57 ms 9452 KB Output is correct
7 Correct 50 ms 9796 KB Output is correct
8 Correct 59 ms 9576 KB Output is correct
9 Correct 56 ms 9364 KB Output is correct
10 Correct 51 ms 9668 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 99 ms 9512 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 204 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 58 ms 9288 KB Output is correct
2 Correct 57 ms 9540 KB Output is correct
3 Correct 62 ms 9612 KB Output is correct
4 Correct 56 ms 9540 KB Output is correct
5 Correct 81 ms 9456 KB Output is correct
6 Correct 59 ms 9388 KB Output is correct
7 Correct 59 ms 9356 KB Output is correct
8 Correct 61 ms 9540 KB Output is correct
9 Correct 58 ms 9428 KB Output is correct
10 Correct 62 ms 9532 KB Output is correct
11 Correct 61 ms 9428 KB Output is correct
12 Correct 50 ms 9676 KB Output is correct
13 Correct 48 ms 9420 KB Output is correct
14 Correct 48 ms 9540 KB Output is correct
15 Correct 58 ms 9412 KB Output is correct
16 Correct 57 ms 9452 KB Output is correct
17 Correct 50 ms 9796 KB Output is correct
18 Correct 59 ms 9576 KB Output is correct
19 Correct 56 ms 9364 KB Output is correct
20 Correct 51 ms 9668 KB Output is correct
21 Incorrect 99 ms 9512 KB Output isn't correct
22 Halted 0 ms 0 KB -