Submission #1103138

#	Time	Username	Problem	Language	Result	Execution time	Memory
1103138		joyboy23ti	Feast (NOI19_feast)	C++14	71 / 100	214 ms	221344 KiB

feast

#include <bits/stdc++.h>
#define fi first
#define se second
#define FOR(i,l,r) for (int i = l; i <= r; i++)
#define FORD(i,l,r) for (int i = l; i >= r; i--)
#define el cout <<"\n"
#define SZ(x) ((int)(x).size())
#define ALL(x) (x).begin(), (x).end()
#define MASK(i) ((1LL)<<(i))
#define BIT(x,i) (((x)>>(i))&(1LL))
#define Debug(a,n) for (int i = 1; i <= n; i++) cout << a[i] << " "; cout << endl
using namespace std;


typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> vii;
typedef unsigned long long ull;
typedef vector<vector<int>> vvi;
int fastMax(int x, int y)
{
    return (((y-x)>>(32-1))&(x^y))^y;
}

const int N=1e6+5;
const int base=311;
const int mod=1e9+7;
const long long INF=1e18+7;
const int d4x[4] = {-1, 0, 1, 0}, d4y[4] = {0, 1, 0, -1};
const int d8x[8] = {-1, -1, 0, 1, 1, 1, 0, -1}, d8y[8] = {0, 1, 1, 1, 0, -1, -1, -1};
template<class X, class Y> bool maximize(X &x, Y y)
{
    if (x < y)
    {
        x = y;
        return true;
    }
    return false;
};
template<class X, class Y> bool minimize(X &x, Y y)
{
    if (x > y)
    {
        x = y;
        return true;
    }
    return false;
};
void add(int &x, int y)
{
    x += y;
    if (x>=mod) x-=mod;
}
void sub(int &x, int y)
{
    x -= y;
    if (x<0) x+=mod;
}
int mul(int x, int y)
{
    return 1LL * x * y % mod;
}
int calPw(int x, int y)
{
    int ans = 1;
    while(y)
    {
        if (y&1) ans = 1LL * ans * x % mod;
        x = 1LL * x * x % mod;
        y >>= 1;
    }
    return ans;
}
///KhengmepfromLTVHSFTG
int n,a[N],k;
ll pre[N],dp[5005][5005];
ll dp2[N][3];
bool check=true,check2=true;
void khengmep()
{
    if(check==true)
    {
        ll sum=0;
        for(int i=1; i<=n; i++)
        {
            sum+=a[i];
        }
        cout<<sum;
        return;
    }
    if(check2==true&&k!=1)
    {
        for(int i=1; i<=n; i++)
        {
            if(a[i]<0)
            {
                cout<<pre[n]-a[i];
                return;
            }
        }
    }
    if(k==1)
    {
        for(int i=1; i<=k; i++)
        {
            ll maxx=-INF;
            for(int j=1; j<=n; j++)
            {
                maxx=max(maxx,dp2[j-1][i-1]-pre[j-1]);
                dp2[j][i]=max(maxx+pre[j],dp2[j-1][i]);
            }
        }
        cout<<dp2[n][k];
        return;
    }
    for(int i=1; i<=k; i++)
    {
        ll maxx=-INF;
        for(int j=1; j<=n; j++)
        {
            maxx=max(maxx,dp[j-1][i-1]-pre[j-1]);
            dp[j][i]=max(maxx+pre[j],dp[j-1][i]);
        }
    }
    cout<<dp[n][k];
}
void ip()
{
    cin>>n>>k;
    pre[0]=0;
    for(int i=1; i<=n; i++)
    {
        cin>>a[i];
        if(check==false&&a[i]<0) check2=false;
        if(a[i]<0) check=false;
        pre[i]=pre[i-1]+a[i];
    }
}
int main()
{
//    freopen("BANQUET.inp","r",stdin);
//    freopen("BANQUET.out","w",stdout);
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(0);
    int t=1;
    //cin>>t;
    while(t--)
    {
        ip();
        khengmep();
    }
    return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 8 / 8
• Subtask 3: 18 / 18
• Subtask 4: 10 / 10
• Subtask 5: 11 / 11
• Subtask 6: 20 / 20
• Subtask 7: 0 / 29