Submission #281816

#	Time	Username	Problem	Language	Result	Execution time	Memory
281816		BeanZ	Stove (JOI18_stove)	C++14	50 / 100	102 ms	153080 KiB

stove

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define endl '\n'
const int N = 1e5 + 5;
const int mod = 1e9 + 7;
ll a[5005], dp[5005][5005][2];
int main(){
        ios_base::sync_with_stdio(false);
        cin.tie(0);
        if (fopen("VietCT.INP", "r")){
                freopen("VietCT.INP", "r", stdin);
                freopen("VietCT.OUT", "w", stdout);
        }
        ll n, k;
        cin >> n >> k;
        for (int i = 1; i <= n; i++) cin >> a[i];
        for (int i = 0; i <= n; i++){
                for (int j = 0; j <= k; j++){
                        for (int x = 0; x < 2; x++){
                                dp[i][j][x] = 1e10;
                        }
                }
        }
        dp[1][1][0] = 1;
        dp[1][1][1] = 1;
        for (int i = 2; i <= n; i++){
                for (int j = 1; j <= min(1ll * i, k); j++){
                        dp[i][j][0] = min(dp[i][j][0], dp[i - 1][j][0] + a[i] - a[i - 1]);
                        dp[i][j][0] = min(dp[i][j][0], dp[i - 1][j - 1][1] + 1);
                        dp[i][j][1] = min(dp[i][j][1], dp[i - 1][j][0] + a[i] - a[i - 1]);
                        dp[i][j][1] = min(dp[i][j][1], dp[i - 1][j - 1][1] + 1);
                }
        }
        ll ans = 1e18;
        for (int i = 1; i <= k; i++){
                ans = min(ans, dp[n][i][1]);
        }
        cout << ans;
}
/*
*/

Compilation message (stderr)

stove.cpp: In function 'int main()':
stove.cpp:14:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   14 |                 freopen("VietCT.INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
stove.cpp:15:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   15 |                 freopen("VietCT.OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 0 / 50