Submission #1004872

#	Time	Username	Problem	Language	Result	Execution time	Memory
1004872		vjudge1	Liteh and Newfiteh (INOI20_litehfiteh)	C++17	0 / 100	48 ms	314336 KiB

Main

#include <bits/stdc++.h>

#define int long long
// #define ll long long
#define pii pair<int, int>
#define all(v) v.begin(), v.end()
using namespace std;
const int oo = 1e18 + 9;
const int MAX = 1e5 + 5, LOGMAX = 20, B = 800, MOD = 1e9 + 7;

int n;
int arr[MAX];
int dp[MAX][LOGMAX][LOGMAX];
int dp2[MAX];

void solve(){
    cin >> n;
    for(int i = 1; i <= n; i++) cin >> arr[i];
    int lg = log2(n);
    for(int i = 0; i < MAX; i++){
        for(int j = 0; j < LOGMAX; j++){
            for(int k = 0; k < LOGMAX; k++){
                dp[i][j][k] = oo;
            }
        }
    }
    for(int i = 1; i <= n; i++){
        if(arr[i] > lg){
            cout << "-1\n";
            return;
        }
        dp[i][0][arr[i]] = 0;
        dp[i][0][arr[i] - 1] = 1;
    }
    for(int i = n; i >= 1; i--){
        for(int j = 1; i + (1 << j) - 1 <= n; j++){
            for(int k = min(LOGMAX - 1, arr[i]); k >= 0; k--){
                dp[i][j][k] = min({dp[i][j - 1][k] + dp[i + (1 << (j - 1))][j - 1][k],
                                  dp[i][j - 1][k + 1] + dp[i + (1 << (j - 1))][j - 1][k + 1] + 1});
                // cout << i << ' ' << j << ' ' << k << ": " << dp[i][j][k] << '\n';
            }
        }
    }
    for(int i = 1; i <= n; i++){
        dp2[i] = oo;
        for(int j = 0; i - (1 << j) >= 0; j++){
            dp2[i] = min(dp2[i - (1 << j)] + dp[i - (1 << j) + 1][j][0], dp2[i]);
        }
    }
    if(dp2[n] >= oo) dp2[n] = -1;
    cout << dp2[n] << '\n';
}   

signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t = 1;
    while(t--) solve();
}

• Subtask 1: 0 / 30
• Subtask 2: 0 / 70