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Submission #534402

# Submission time Handle Problem Language Result Execution time Memory
534402 2022-03-08T06:36:47 Z idas Feast (NOI19_feast) C++11
12 / 100
 120 ms 9688 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});
        dp[i]=max(dp[i], {dp[i-1].f-x,dp[i-1].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});
        dp[i]=max(dp[i], {dp[i-1].f-x,dp[i-1].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 65 ms 9396 KB Output is correct
2 Correct 67 ms 9572 KB Output is correct
3 Correct 77 ms 9668 KB Output is correct
4 Correct 91 ms 9532 KB Output is correct
5 Correct 74 ms 9668 KB Output is correct
6 Correct 71 ms 9428 KB Output is correct
7 Correct 66 ms 9344 KB Output is correct
8 Correct 69 ms 9548 KB Output is correct
9 Correct 74 ms 9428 KB Output is correct
10 Correct 68 ms 9520 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 74 ms 9468 KB Output is correct
2 Correct 66 ms 9668 KB Output is correct
3 Correct 58 ms 9420 KB Output is correct
4 Correct 74 ms 9536 KB Output is correct
5 Correct 68 ms 9412 KB Output is correct
6 Correct 61 ms 9452 KB Output is correct
7 Correct 63 ms 9688 KB Output is correct
8 Correct 69 ms 9632 KB Output is correct
9 Correct 67 ms 9372 KB Output is correct
10 Correct 60 ms 9612 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 120 ms 9588 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 65 ms 9396 KB Output is correct
2 Correct 67 ms 9572 KB Output is correct
3 Correct 77 ms 9668 KB Output is correct
4 Correct 91 ms 9532 KB Output is correct
5 Correct 74 ms 9668 KB Output is correct
6 Correct 71 ms 9428 KB Output is correct
7 Correct 66 ms 9344 KB Output is correct
8 Correct 69 ms 9548 KB Output is correct
9 Correct 74 ms 9428 KB Output is correct
10 Correct 68 ms 9520 KB Output is correct
11 Correct 74 ms 9468 KB Output is correct
12 Correct 66 ms 9668 KB Output is correct
13 Correct 58 ms 9420 KB Output is correct
14 Correct 74 ms 9536 KB Output is correct
15 Correct 68 ms 9412 KB Output is correct
16 Correct 61 ms 9452 KB Output is correct
17 Correct 63 ms 9688 KB Output is correct
18 Correct 69 ms 9632 KB Output is correct
19 Correct 67 ms 9372 KB Output is correct
20 Correct 60 ms 9612 KB Output is correct
21 Incorrect 120 ms 9588 KB Output isn't correct
22 Halted 0 ms 0 KB -