Submission #1084423

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1084423	2024-09-06 08:35:23	_rain_	Discharging (NOI20_discharging)	C++14	9 / 100	9 ms	3164 KiB

Discharging

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#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fixbug true
const ll INF = (ll)1e18+7;
const int maxn = 1e5;
ll a[maxn+2] ;
int n;
namespace subtask1{
    bool check(){
        return n <= 1500;
    }
    const int N = 1500;
    ll f[N+2] , sum[N+2] = {};
    void main_code(){
        for (int i = 1; i <= n; ++i) f[i] = INF ;
        for (int i = 1; i <= n; ++i){
            ll mx = a[i];
            for (int j = i; j >= 1; --j){
                mx = max(mx , a[j]);
                //ll v = f[j - 1] + sum[j - 1] * i - sum[j - 1] * (j + 1) + mx * i - mx * (j + 1);
                ll v = f[j - 1] + (sum[j - 1] + mx) * (i - j + 1);
                if (f[i] == v){
                    sum[i] = min(sum[i] , sum[j - 1] + mx);
                }
                else if (f[i] > v) {
                    f[i] = v;
 
 
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Compilation message (stderr)

Discharging.cpp: In function 'int main()':
Discharging.cpp:45:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |         freopen(name".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 0 / 13
• Subtask 3: 0 / 25
• Subtask 4: 0 / 11
• Subtask 5: 0 / 14
• Subtask 6: 0 / 28