Submission #417363

#	Time	Username	Problem	Language	Result	Execution time	Memory
417363		doowey	Cigle (COI21_cigle)	C++14	48 / 100	1085 ms	42592 KiB

cigle

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

#define fi first
#define se second
#define mp make_pair
#define fastIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);

const int N = 5010;
int dp[N][N];
int D[N];

struct Node{
    int val;
    int lzy;
};

Node T[N * 4 + 16];

void push(int node, int cl, int cr){
    T[node].val += T[node].lzy;
    if(cl != cr){
        T[node * 2].lzy += T[node].lzy;
        T[node * 2 + 1].lzy += T[node].lzy;
    }
    T[node].lzy = 0;
}

void update(int node, int cl, int cr, int tl, int tr, int v){
    push(node, cl, cr);
    if(cr < tl || cl > tr) return;
    if(cl >= tl && cr <= tr){
        T[node].lzy = v;
        push(node, cl, cr);
        return;
    }
    int mid = (cl + cr) / 2;
    update(node * 2, cl, mid, tl, tr, v);
    update(node * 2 + 1, mid + 1, cr, tl, tr, v);
    T[node].val = max(T[node * 2].val, T[node * 2 + 1].val);
}

void build(int node, int cl, int cr){
    T[node].val = 0;
    T[node].lzy = 0;
    if(cl == cr) return ;
    int mid = (cl + cr) / 2;
    build(node * 2, cl, mid);
    build(node * 2 + 1, mid + 1, cr);
}

int main(){
    fastIO;
    //freopen("in.txt","r",stdin);
    int n;
    cin >> n;
    for(int i = 1; i <= n; i ++ ){
        cin >> D[i];
    }
    int pp;
    int cum;
    int cur;
    int outp = 0;
    for(int cut = 2; cut <= n; cut ++ ){
        build(1, 1, cut - 1);
        for(int j = cut - 1; j >= 1; j -- ){
            update(1, 1, cut - 1, j, j, dp[j][cut - 1]);
        }
        cur = 0;
        cum = 0;
        pp = cut;
        for(int go = cut; go <= n; go ++ ){
            dp[cut][go] = T[1].val;
            if(go == n)
                outp = max(outp, dp[cut][go]);

            cur += D[go];
            while(pp > 1 && cum < cur){
                pp --;
                cum += D[pp];
            }
            if(cum == cur){
                update(1, 1, cut - 1, 1, pp - 1, +1);
            }
        }
    }
    cout << outp << "\n";
    return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 11 / 11
• Subtask 3: 13 / 13
• Subtask 4: 15 / 15
• Subtask 5: 0 / 52