Submission #92408

#	Time	Username	Problem	Language	Result	Execution time	Memory
92408		Vardanyan	Split the sequence (APIO14_sequence)	C++14	0 / 100	120 ms	132096 KiB

sequence

//#pragma GCC optimize "-O3"
#include<bits/stdc++.h>

using namespace std;
const int N = 1000*100+5;
const long long INF = 1000000000000000000;

int a[N];
long long pref[N];
pair<long long,int> dp[208][N];
int par[208][N];
void get(int kk,int l,int r,int s,int e){
    if(l>r) return;
    int i = (l+r)/2;
    int pos = 0;
    for(int j = s;j<=e;j++){
            if(j>i) break;
        if(dp[kk-1][j].first+(pref[i]-pref[j])*pref[j]>dp[kk][i].first || dp[kk][i].first == -1){
                    dp[kk][i].first = dp[kk-1][j].first+(pref[i]-pref[j])*pref[j];
                    dp[kk][i].second = j;
                    pos = j;
        }
    }
    get(kk,l,i-1,s,pos);
    get(kk,i+1,r,pos,e);
}
int main()
{
    int n,k;
    scanf("%d%d",&n,&k);
    for(int i = 1;i<=n;i++) scanf("%d",&a[i]);
    for(int i = 1;i<=n;i++) pref[i] = pref[i-1]+a[i];
 //   node* old = new node();
   // node* nold = new node();
   memset(dp,-1,sizeof dp);
   for(int i = 1;i<=n;i++) dp[0][i].first = 0;
    for(int kk = 1;kk<=k;kk++){
            /*if(kk == 1){
            for(int i = 1;i<=n;i++){
                for(int j = dp[kk-1][i].second;j<i;j++){
                    if(dp[kk-1][j].first+(pref[i]-pref[j])*pref[j]>=dp[kk][i].first){
                        dp[kk][i].first = dp[kk-1][j].first+(pref[i]-pref[j])*pref[j];
                        dp[kk][i].second = j;
                        }
                    }
                }
                continue;
            }*/
            get(kk,kk,n,1,n);
    }
    printf("%lld\n",dp[k][n].first);
    int kk = k;
    int nn = n;
    while(kk>0){
        printf("%d\n",dp[kk][nn].second);
        nn = dp[kk][nn].second;
        kk--;
    }
    printf("\n");
    return 0;
}

Compilation message (stderr)

sequence.cpp: In function 'int main()':
sequence.cpp:30:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&k);
     ~~~~~^~~~~~~~~~~~~~
sequence.cpp:31:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i = 1;i<=n;i++) scanf("%d",&a[i]);
                             ~~~~~^~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 11
• Subtask 3: 0 / 11
• Subtask 4: 0 / 17
• Subtask 5: 0 / 21
• Subtask 6: 0 / 29