Playrix Codescapes Cup (Codeforces Round #413, rated, Div. 1 + Div. 2), problem: (E) Aquarium decoration Solution In C/C++

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
#define N 200010
#define ll long long
#define INF 2000000000
ll Ans=1e18,Res;
int i,j,k,n,Sum,m,x,y,l[4],a[N],b[4][N],p[4],M,f[N];
inline int Min(int x,int y){return x<y?x:y;}
inline ll Min(ll x,ll y){return x<y?x:y;}
int main(){
scanf(“%d%d%d”,&n,&m,&k);
for(i=1;i<=n;i++)scanf(“%d”,&a[i]);
scanf(“%d”,&x);
while(x–)scanf(“%d”,&y),f[y]=1;
scanf(“%d”,&x);
while(x–){
scanf(“%d”,&y);
if(f[y])f[y]=3;else f[y]=2;
}
for(i=1;i<=n;i++)
if(f[i]==3)b[0][++l[0]]=a[i];else
if(f[i]==1)b[1][++l[1]]=a[i];else
if(f[i]==2)b[2][++l[2]]=a[i];else b[3][++l[3]]=a[i],f[i]=l[3];
sort(b[0]+1,b[0]+l[0]+1);sort(b[1]+1,b[1]+l[1]+1);
sort(b[2]+1,b[2]+l[2]+1);sort(b[3]+1,b[3]+l[3]+1);
for(i=0;i<4;i++)b[i][l[i]+1]=INF,p[i]=1;
for(i=0;i<=l[0]&&i<=m;i++){
if(k-i>l[1]||k-i>l[2])continue;
while(p[0]<=i){
Res+=b[0][p[0]++];
Sum++;
}
if(k-i+2==p[1]){
Res-=b[1][–p[1]];
Sum–;
}
while(k-i>=p[1]){
Res+=b[1][p[1]++];
Sum++;
}
if(k-i+2==p[2]){
Res-=b[2][–p[2]];
Sum–;
}
while(k-i>=p[2]){
Res+=b[2][p[2]++];
Sum++;
}
while(Sum<m){
M=INF;
for(j=0;j<4;j++)if(p[j]<=l[j])M=Min(M,b[j][p[j]]);
if(M==INF)break;
for(j=0;j<4;j++)
if(b[j][p[j]]==M){
Res+=b[j][p[j]++];
break;
}
Sum++;
}
if(Sum==m)Ans=Min(Ans,Res);
}
if(Ans==1e18)puts(“-1”);else printf(“%I64d\n”,Ans);
return 0;
}