Submission #42705

#	Time	Username	Problem	Language	Result	Execution time	Memory
42705		repeating	Split the sequence (APIO14_sequence)	C++11	0 / 100	2071 ms	64124 KiB

sequence

#include <bits/stdc++.h>

#define F first
#define S second
#define P push
#define pb push_back
#define MEM(dp,i) memset(dp,i,sizeof(dp))
#define W while
#define R return
#define C continue
#define SI size()
#define ll long long
#define ld long double
#define pll pair<ll,ll>
#define pii pair<int,int>
#define SF(x) scanf("%Id",&x)
#define SF2(x,y) scanf("%Id%Id",&x,&y)
#define SF3(x,y,z) scanf("%I64d%I64d%I64d",&x,&y,&z)
#define SF4(x,y,z,o) scanf("%I64d%I64d%I64d%I64d",&x,&y,&z,&o)
#define all(v) v.begin(),v.end()

using namespace std;
const long long INF = 1e9+1;
const long long MOD = 1e9+7;
const int MX=100015;
ll a[MX];
ll n,m;
ll SUM;
vector<ll> v;
ll val;
ll dp[10005][802];
ll su[10005];
ll DP(ll x,ll k){
    if(k==0)R 0;
    if(x==n)R -INF;
    ll sum=0;
    ll &ret=dp[x][k];
    if(ret!=-1)R ret;
    ret=-INF;
    ll z;
    for(int i=x;i<n;i++){
        z=DP(i+1,k-1);
//        cout<<z<<endl;
        if(z==-INF)break;
        sum+=a[i];
        if(val>=sum)continue;
        ret=max(ret,z+(sum*su[i+1]));
//        cout<<sum*su[i+1]<<endl;
    }
    R ret;
}
void fs(ll x,ll k){
    if(k==0)R;
    ll sum=0;
    ll ret=dp[x][k];
    ll z;
    for(int i=x;i<n;i++){
        z=DP(i+1,k-1);
        if(z==-INF)break;
        sum+=a[i];
        if(val>sum)continue;
        if(ret==z+(sum*su[i+1])){
            cout<<i+1<<" ";
            fs(i+1,k-1);
            R;
        }
    }
}
ll solve(){
    ll l=0,r=1e9+1;
    W(l<r){
//        l=5,r=5;
        ll mid=(l+r)/2;
        ll k=m+1;
        for(int i=0;i<n;i++){
            ll sum=0;
            W(i<n){
                sum+=a[i];
                if(sum>=mid){
                    k--;
                    break;
                }
                i++;
            }
            if(k==0){
                val=mid;
                l=mid+1;
                break;
            }
        }
        if(k){
            r=mid;
        }
    }
    ll res=DP(0,m);
    R res;
}

int main(){
    MEM(dp,-1);
    cin>>n>>m;
    for(ll i=0;i<n;i++){
        cin>>a[i];
        SUM+=a[i];
    }
    for(ll i=n-1;i>=0;i--)
        su[i]=su[i+1]+a[i];
    ll z=SUM;
    ll res=solve();
    cout<<res<<endl;
    fs(0,m);
}

Compilation message (stderr)

sequence.cpp: In function 'int main()':
sequence.cpp:108:8: warning: unused variable 'z' [-Wunused-variable]
     ll z=SUM;
        ^

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