oj.uz

Submission #826349

# Submission time Handle Problem Language Result Execution time Memory
826349 2023-08-15T13:20:40 Z YassineBenYounes Liteh and Newfiteh (INOI20_litehfiteh) C++17
30 / 100
 2000 ms 9940 KB 
#include<bits/stdc++.h>
using namespace std;
void init(){
    #ifndef ONLINE_JUDGE
 
freopen("input.txt", "r", stdin);
 
freopen("output.txt", "w", stdout);
 
#endif // ONLINE_JUDGE
}
typedef long long ll;
#define pii pair<int, int>
#define ff first
#define ss second
#define vii vector<pii>
#define pb push_back
#define vi vector<int>
const int mx = 1e5+5;
const ll inf = 1e15;
const int LOG = 20;

int n;
int arr[mx];
ll dp[mx];
int st[mx][LOG];
int lg[mx];

void pre_log(int n){
    lg[1] = 0;
    for(int i = 2; i <= n;i++){
        lg[i] = lg[i/2]+1;
    }
}

void build(){
    for(int i = 0; i < n;i++){
        st[i][0] = arr[i];
    }
    for(int j = 1;j < LOG;j++){
        for(int i = 0; i < n;i++){
            int pos = i + (1 << (j-1));
            if(pos >= n)continue;
            st[i][j] = min(st[i][j-1], st[pos][j-1]);
        }
    }
}

int min_query(int a, int b){
    int sz = b-a+1;
    int k = lg[sz];
    return min(st[a][k], st[b-(1<<k)+1][k]);
}

ll f(int l, int r, int c){
    ll ans = 0;
    int k = min_query(l, r);
    if((k-c) != 0){
        c++;
        ans++;
    }
    if(l == r){
        if((arr[l]-c) != 0)return inf;
        return ans;
    }
    int md = (l+r)/2;
    ans += f(l, md, c) + f(md+1, r, c);
    return ans;
}

int32_t main(){
    //init();
    cin.tie();cout.tie();ios::sync_with_stdio(false);
    cin >> n;
    pre_log(n+1);
    for(int i = 0; i < n;i++){
        cin >> arr[i];
        if(arr[i] > LOG){
            cout << -1 << endl;
            return 0;
        }
    }
    build();
    for(int i = 0; i <= n;i++){
        dp[i] = inf;
    }
    dp[0] = 0;
    for(int ind = 0; ind < n;ind++){
        for(int i = 1; ind+i-1 < n; i*=2){
            dp[ind+i] = min(dp[ind+i], dp[ind] + f(ind, ind+i-1, 0));
        }
    }
    cout << (dp[n] >= inf ? -1 : dp[n]) << endl;
}

Compilation message

Main.cpp: In function 'void init()':
Main.cpp:6:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    6 | freopen("input.txt", "r", stdin);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:8:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 | freopen("output.txt", "w", stdout);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 340 KB Output is correct
2 Correct 4 ms 328 KB Output is correct
3 Correct 4 ms 340 KB Output is correct
4 Correct 5 ms 340 KB Output is correct
5 Correct 4 ms 328 KB Output is correct
6 Correct 4 ms 340 KB Output is correct
7 Correct 4 ms 340 KB Output is correct
8 Correct 4 ms 340 KB Output is correct
9 Correct 4 ms 340 KB Output is correct
10 Correct 4 ms 340 KB Output is correct
11 Correct 4 ms 340 KB Output is correct
12 Correct 4 ms 328 KB Output is correct
13 Correct 4 ms 340 KB Output is correct

Subtask #2
0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 340 KB Output is correct
2 Correct 4 ms 328 KB Output is correct
3 Correct 4 ms 340 KB Output is correct
4 Correct 5 ms 340 KB Output is correct
5 Correct 4 ms 328 KB Output is correct
6 Correct 4 ms 340 KB Output is correct
7 Correct 4 ms 340 KB Output is correct
8 Correct 4 ms 340 KB Output is correct
9 Correct 4 ms 340 KB Output is correct
10 Correct 4 ms 340 KB Output is correct
11 Correct 4 ms 340 KB Output is correct
12 Correct 4 ms 328 KB Output is correct
13 Correct 4 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 0 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 11 ms 440 KB Output is correct
19 Correct 9 ms 444 KB Output is correct
20 Correct 940 ms 1292 KB Output is correct
21 Correct 1026 ms 1284 KB Output is correct
22 Execution timed out 2076 ms 9940 KB Time limit exceeded
23 Halted 0 ms 0 KB -