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Submission #308145

# Submission time Handle Problem Language Result Execution time Memory
308145 2020-09-30T05:53:50 Z talant117408 Rice Hub (IOI11_ricehub) C++17
0 / 100
 5 ms 2816 KB 
#include "ricehub.h"

#include <bits/stdc++.h>

using namespace std;

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

#define pb push_back
#define mp make_pair
#define all(v) v.begin(),v.end()

const int N = 1e5+7;
vector <ll> pref(N), suff(N), v(N);
int n;

ll getpref(int l, int r){
    return pref[r]-1ll*(l-1)*(v[r]-v[l-1])-pref[l-1];
}

ll getsuff(int l, int r){
    return suff[l]-1ll*(n-r)*(v[r+1]-v[l])-suff[r+1];
}

bool check(int l, int r, ll B){
    int flag = 0, x = r-l+1;
    for(int i = 1; i+x-1 <= n; i++){
        int mid = (i+i+x-1) >> 1;
        if(getpref(i, mid)+getsuff(mid, i+x-1) <= B){
            flag++;
            break;
        }
    }
    return flag;
}

int besthub(int R, int L, int X[], long long B){
    n = R;
    int i;
    for(i = 0; i < R; i++){
        v[i+1] = X[i];
    }
    for(i = 1; i <= n; i++){
        pref[i] = pref[i-1]+1ll*(i-1)*(v[i]-v[i-1]);
    }
    for(i = n; i; i--){
        suff[i] = suff[i+1]+1ll*(n-i)*(v[i+1]-v[i]);
    }
    
    int l = 1, r = n;
    while(l < r){
        int mid = (l+r) >> 1;
        if(check(l, r, B)) l = mid+1;
        else r = mid;
    }
    
    return l;
}

Subtask #1
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2688 KB Output is correct
2 Incorrect 2 ms 2688 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2688 KB Output is correct
2 Correct 2 ms 2688 KB Output is correct
3 Correct 2 ms 2688 KB Output is correct
4 Incorrect 2 ms 2688 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 26.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2688 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 32.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 2816 KB Output isn't correct
2 Halted 0 ms 0 KB -