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Submission #534397

# Submission time Handle Problem Language Result Execution time Memory
534397 2022-03-08T06:30:37 Z idas Feast (NOI19_feast) C++11
0 / 100
 1000 ms 9776 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=-INF, 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
0 / 4.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1084 ms 9292 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 62 ms 9420 KB Output is correct
2 Correct 63 ms 9776 KB Output is correct
3 Correct 48 ms 9360 KB Output is correct
4 Execution timed out 1070 ms 9548 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 103 ms 9600 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 Execution timed out 1084 ms 9292 KB Time limit exceeded
2 Halted 0 ms 0 KB -