Submission #490253

#	Time	Username	Problem	Language	Result	Execution time	Memory
490253		cpp219	Holding (COCI20_holding)	C++14	110 / 110	80 ms	6744 KiB

holding

#include<bits/stdc++.h>
#define ll int
#define ld long double
#define fs first
#define sc second
#define debug(y) cout<<y,exit(0)
using namespace std;
typedef pair<ll,ll> LL;
const ll N = 1e2 + 9;
const ll mod = 1e9 + 7;
const ll base = 31;

ll n,l,r,k,dp[N][N*N],prv[N][N*N],a[N];

int main(){
    ios_base::sync_with_stdio(NULL); cin.tie(0); cout.tie(0);
    #define task "tst"
    if (fopen(task".inp","r")){
        freopen(task".inp","r",stdin);
        //freopen(task".out","w",stdout);
    }
    cin>>n>>l>>r>>k;
    for (ll i = 1;i <= n;i++) cin>>a[i];
    for (ll pos = r;pos >= l;pos--){
        for (ll cur = r;cur <= n;cur++){
            for (ll rm = 0;rm <= k;rm++){
                ll &res = dp[cur][rm];
                if (cur == r) res = prv[cur][rm] + a[pos];
                else{
                    ll d = abs(cur - pos);
                    res = min(dp[cur - 1][rm],prv[cur][rm] + a[pos]);
                    if (rm >= d) res = min(res,prv[cur - 1][rm - d] + a[cur]);
                }
            }
        }
        for (ll cur = l;cur > 0;cur--){
            for (ll rm = 0;rm <= k;rm++){
                ll &res = dp[cur][rm];
                if (cur == l) res = dp[n][rm];
                else{
                    ll d = abs(cur - pos);
                    res = min(dp[cur + 1][rm],prv[cur][rm] + a[pos]);
                    if (rm >= d) res = min(res,prv[cur + 1][rm - d] + a[cur]);
                }
            }
        }
        for (ll i = 1;i <= n;i++)
            for (ll j = 0;j <= k;j++) prv[i][j] = dp[i][j];
    }
    cout<<dp[1][k];
}

/* stuff you should look for
	* int overflow, array bounds
	* special cases (n=1?)
	* do smth instead of nothing and stay organized
	* WRITE STUFF DOWN
	* DON'T GET STUCK ON ONE APPROACH
*/

Compilation message (stderr)

holding.cpp: In function 'int main()':
holding.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 33 / 33
• Subtask 3: 33 / 33
• Subtask 4: 22 / 22