Submission #1293628

#	Time	Username	Problem	Language	Result	Execution time	Memory
1293628		trandaihao5555	Split the sequence (APIO14_sequence)	C++20	0 / 100	1 ms	344 KiB

sequence

#include <bits/stdc++.h>

//#define int long long

#define debug     cout << "ok\n";
#define SQR(x)    (1LL * ((x) * (x)))
#define MASK(i)   (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
#define fi        first
#define se        second
#define pb        push_back

#define mp make_pair
#define pii pair<int,int>
#define pli pair<ll,int>
#define vi vector<int>

#define FAST ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef unsigned int ui;

using namespace std;

const int M = 1e9 + 7;
const int INF = 1e9 + 7;
const ll INFLL = (ll)2e18 + 7LL;
const ld PI = acos(-1);

const int dx[] = {1, -1, 0, 0, -1, 1, 1, -1};
const int dy[] = {0, 0, 1, -1, -1, -1, 1, 1};

template<class _, class __>
    bool minimize(_ &x, const __ y){
        if(x > y){
            x = y;
            return true;
        } else return false;
    }
template<class _, class __>
    bool maximize(_ &x, const __ y){
        if(x < y){
            x = y;
            return true;
        } else return false;
    }

template<class _,class __>
    void Add(_ &x, const __ y) {
        x += y;
        if (x >= M) {
            x -= M;
        }
        return;
    }

template<class _,class __>
    void Diff(_ &x, const __ y) {
        x -= y;
        if (x < 0) {
            x += M;
        }
        return;
    }

//--------------------------------------------------------------

const int MaxN = 1e6+7;
const int MaxK = 207;

vi dp_be,dp_af,trace[MaxK];
int n,k,a[MaxN];

int sum(int l,int r) {
    return a[r] - a[l-1];
}

void dnc(int l,int r,int ls,int rs,vi & trace) {
    if (l > r) return;
    int mid = (l + r) >> 1;
    for (int i=ls;i<mid && i <= rs;i++) {
        if (maximize(dp_af[mid],dp_be[i] + 1LL*sum(i+1,mid) * a[i])) trace[mid] = i;
    }

    dnc(l,mid-1,ls,trace[mid],trace);
    dnc(mid+1,r,trace[mid],rs,trace);
}

void sol() {
    cin >> n >> k;
    k++;
    for (int i=1;i<=n;i++) cin >> a[i],a[i] += a[i-1];
    dp_be.resize(n+1,-INFLL);
    dp_af.resize(n+1,-INFLL);
    dp_af[0] = 0;
    trace[0].resize(n+1);
    for (int i=1;i<=k;i++) {
        trace[i] = trace[0];
    }
    for (int i=1;i<=k;i++) {
        swap(dp_be,dp_af);
        for (int & x : dp_af) x = -INFLL;
        dnc(i,n,i-1,n,trace[i]);
    }
    cout << dp_af[n] << '\n';
    int tmp = trace[k--][n];
    while (k) {
        cout << tmp << ' ';
        tmp = trace[k][tmp];
        k--;
    }
}

signed main() {
//    freopen("test.inp","r",stdin);
//    freopen("test.out","w",stdout);
    FAST
    int t=1;
//    cin >> t;
    while (t--) sol();
}

Compilation message (stderr)

sequence.cpp: In function 'void sol()':
sequence.cpp:95:22: warning: overflow in conversion from 'long long int' to 'std::vector<int>::value_type' {aka 'int'} changes value from '-2000000000000000007' to '-1321730055' [-Woverflow]
   95 |     dp_be.resize(n+1,-INFLL);
      |                      ^~~~~~
sequence.cpp:96:22: warning: overflow in conversion from 'long long int' to 'std::vector<int>::value_type' {aka 'int'} changes value from '-2000000000000000007' to '-1321730055' [-Woverflow]
   96 |     dp_af.resize(n+1,-INFLL);
      |                      ^~~~~~
sequence.cpp:104:35: warning: overflow in conversion from 'long long int' to 'int' changes value from '-2000000000000000007' to '-1321730055' [-Woverflow]
  104 |         for (int & x : dp_af) x = -INFLL;
      |                                   ^~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 11
• Subtask 3: 0 / 11
• Subtask 4: 0 / 17
• Subtask 5: 0 / 21
• Subtask 6: 0 / 29