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답안 #1104199

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1104199 2024-10-23T08:45:05 Z nasir_bashirov Feast (NOI19_feast) C++11
0 / 100
 132 ms 12128 KB 
// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define vi vector<int>
#define vl vector<ll>
#define vii vector<pii>
#define db long double
#define vll vector<pll>
#define endl '\n'
#define all(x) x.begin(), x.end()
#define fastio ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

#define int long long

const int sz = 3e5 + 5;
int n, k, a[sz];
pii dp[sz][2];

void calc(int mid){
    dp[1][0] = {0, 0}, dp[1][1] = {a[1] - mid, 1};
    for(int i = 2; i <= n; i++){
        dp[i][0] = max(dp[i - 1][0], dp[i - 1][1]);
        dp[i][1] = max(make_pair(dp[i - 1][0].first + a[i] - mid, dp[i - 1][0].second + 1), make_pair(dp[i - 1][1].first + a[i], dp[i - 1][1].second));
    }
}

void fmain(){
    cin >> n >> k;
    //int cnt = 0;
    for(int i = 1; i <= n; i++){
        cin >> a[i];
     //   if(a[i] > 0)    cnt++;
    }
    // k = min(k, cnt);
    int l = 0, r = 1e14, res = 0;
    while(l <= r){
        int mid = (l + r) / 2;
        calc(mid);
        if(max(dp[n][0], dp[n][1]).second >= k){
            res = max(res, max((dp[n][1].first + k * mid) * (dp[n][1].second >= k), (dp[n][0].first + k * mid) * (dp[n][1].second >= k)));
            // cout << mid << " " << dp[n][0].first << " " << dp[n][0].second << "  " << dp[n][1].first << " " << dp[n][1].second << endl;
            // cout << (dp[n][1].first + k * mid) * (dp[n][1].second >= k) << " " << (dp[n][0].first + k * mid) * (dp[n][1].second >= k) << endl << endl;
            l = mid + 1;
        } 
        else{
            r = mid - 1;
        }
    }
    cout << res;
}

signed main(){
    int tmr = 1;
    //cin >> tmr;
    while(tmr--){
        fmain();
    }
}

Subtask #1
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 95 ms 11956 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 65 ms 12128 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 132 ms 12104 KB Output is correct
2 Incorrect 127 ms 12104 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2556 KB Output is correct
2 Incorrect 1 ms 2384 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2556 KB Output is correct
2 Incorrect 1 ms 2384 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2556 KB Output is correct
2 Incorrect 1 ms 2384 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 95 ms 11956 KB Output isn't correct
2 Halted 0 ms 0 KB -