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답안 #224700

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
224700 2020-04-18T15:52:24 Z kshitij_sodani Feast (NOI19_feast) C++17
30 / 100
 54 ms 2688 KB 
#include <iostream>
#include <bits/stdc++.h>
using namespace std;
#define a first
#define b second
#define pb push_back
typedef long long  llo;
llo mod=1000000007;
/*llo dp[2001][2001];
llo cost[2001][2001];*/
llo ma=0;
/*llo dnc(llo ind,llo l,llo r,llo ll,llo rr){
	llo mid=(l+r)/2;
	pair<llo,llo> best={-1,-1};
	for(llo i=ll;i<=rr;i++){
		if(i>mid){
			continue;
		}
		if(i==ll){
			if(i==0){
				best={-cost[0][mid],i};
			}
			else{
				best={-dp[i-1][ind-1]-cost[i][mid],i};
			}
		}

		else{
			best=min(best,{-dp[i-1][ind-1]-cost[i][mid],i});
		}
	}
	
	dp[mid][ind]=-best.a;

	ma=max(ma,dp[mid][ind]);
	if(mid>l){
		dnc(ind,l,mid-1,ll,best.b);
	}
	if(mid<r){
		dnc(ind,mid+1,r,best.b,rr);
	}
}*/
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	llo n,k;
	cin>>n>>k;
	llo it[n];
	for(llo i=0;i<n;i++){
		cin>>it[i];
	}
	if(k==1){
		llo su=0;
		for(llo i=0;i<n;i++){
			su+=it[i];
			su=max(su,(llo)0);
			ma=max(ma,su);
		}
		cout<<ma<<endl;
		return 0;
	}
	llo ind=0;
	vector<llo> aa;
	while(ind<n){
		if(it[ind]<=0){
			llo su=0;
			while(ind<n){
				if(it[ind]>0){
					break;
				}
				su+=it[ind];
				ind+=1;
			}
			aa.pb(su);
		}
		if(it[ind]>0){
			llo su=0;
			while(ind<n){
				if(it[ind]<0){
					break;
				}
				su+=it[ind];
				ind+=1;
			}
			aa.pb(su);
		}
	}
	set<pair<llo,llo>> ac;
	llo kk=0;
	llo ll=aa.size()-1;
/*	if(aa[aa.size()-1]<0){
		ll-=1;
	}
	if(aa[0]<0){
		kk+=1;
	}*/
	llo le[aa.size()];
	llo re[aa.size()];
	llo tot=0;
	for(llo i=0;i<aa.size();i++){
		if(aa[i]>0){
			tot+=1;
		}
		if(i>kk and i<=ll){
			le[i]=i-1;
		}
		else{
			le[i]=-1;
		}
	}
	for(llo i=0;i<aa.size();i++){
		if(i>=kk and i<ll){
			re[i]=i+1;
		}
		else{
			re[i]=-1;
		}
	}

	for(llo i=kk;i<=ll;i++){
		ac.insert({abs(aa[i]),i});
	}

	while(tot>k ){
		auto xx=ac.begin();
		llo ind=(*xx).b;
		ac.erase(xx);
		int st=1;
		if(le[ind]!=-1){
			if(aa[ind]>0 and le[le[ind]]==-1){
				st=0;
			}
			else if(aa[ind]<0 and re[ind]==-1){
				st=0;
			}
			else{
				ac.erase({aa[le[ind]],le[ind]});
				aa[ind]+=aa[le[ind]];

			//	le[ind]=-1;
				if(le[le[ind]]!=-1){
					le[ind]=le[le[ind]];
					re[le[le[ind]]]=ind;
				}
				else{
					le[ind]=-1;
				}
			}
		}
		if(re[ind]!=-1){
			if(aa[ind]>0 and re[re[ind]]==-1){
				st=0;
			}
			else if(aa[ind]<0 and le[ind]==-1){
				st=0;
			}
			else{
				ac.erase({aa[re[ind]],re[ind]});
				aa[ind]+=aa[re[ind]];
			//	re[ind]=-1;
				if(re[re[ind]]!=-1){
					re[ind]=re[re[ind]];
					le[re[re[ind]]]=ind;
				}
				else{
					re[ind]=-1;
				}
			}
		}
		if(st){
			tot-=1;
			ac.insert({abs(aa[ind]),ind});
		}
		
	}

	for(llo i=kk;i<=ll;i++){
		if(aa[i]>0){
			ma+=aa[i];
		}
	}
	cout<<ma<<endl;
/*	llo j=0;
	for(llo i=0;i<aa.size();i++){
		if(aa[i]>0){
			llo ma=0;
			llo su=0;
			llo ind=i;
			llo ind2=j;
			while(ind>=0){
				su+=aa[ind];
				ma=max(ma,su);
				if(aa[ind]>0){
					cost[ind2][j]=ma;
					ind2-=1;
				}
				ind-=1;
			}	
			j+=1;
		}
	}
	for(llo i=0;i<j;i++){
		dp[i][0]=cost[0][i];
		ma=max(ma,cost[0][i]);
	}
	for(llo jj=1;jj<min(j,k);jj++){
		dnc(jj,0,j-1,0,j-1);

	}
	cout<<ma<<endl;
*/
	return 0;
}

Compilation message

feast.cpp: In function 'int main()':
feast.cpp:100:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(llo i=0;i<aa.size();i++){
              ~^~~~~~~~~~
feast.cpp:111:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(llo i=0;i<aa.size();i++){
              ~^~~~~~~~~~

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 45 ms 2552 KB Output is correct
2 Correct 44 ms 2684 KB Output is correct
3 Correct 45 ms 2680 KB Output is correct
4 Correct 44 ms 2680 KB Output is correct
5 Correct 44 ms 2680 KB Output is correct
6 Correct 44 ms 2552 KB Output is correct
7 Correct 43 ms 2552 KB Output is correct
8 Correct 44 ms 2680 KB Output is correct
9 Correct 44 ms 2680 KB Output is correct
10 Correct 46 ms 2680 KB Output is correct

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 25 ms 2680 KB Output is correct
2 Correct 27 ms 2688 KB Output is correct
3 Correct 28 ms 2688 KB Output is correct
4 Correct 29 ms 2688 KB Output is correct
5 Correct 45 ms 2588 KB Output is correct
6 Correct 27 ms 2688 KB Output is correct
7 Correct 28 ms 2688 KB Output is correct
8 Correct 45 ms 2680 KB Output is correct
9 Correct 44 ms 2552 KB Output is correct
10 Correct 25 ms 2688 KB Output is correct

Subtask #3
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 47 ms 2680 KB Output is correct
2 Correct 50 ms 2552 KB Output is correct
3 Correct 50 ms 2684 KB Output is correct
4 Correct 49 ms 2560 KB Output is correct
5 Correct 49 ms 2680 KB Output is correct
6 Correct 49 ms 2684 KB Output is correct
7 Correct 50 ms 2680 KB Output is correct
8 Correct 48 ms 2680 KB Output is correct
9 Correct 48 ms 2680 KB Output is correct
10 Correct 54 ms 2684 KB Output is correct

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Incorrect 4 ms 384 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Incorrect 4 ms 384 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Incorrect 4 ms 384 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Correct 45 ms 2552 KB Output is correct
2 Correct 44 ms 2684 KB Output is correct
3 Correct 45 ms 2680 KB Output is correct
4 Correct 44 ms 2680 KB Output is correct
5 Correct 44 ms 2680 KB Output is correct
6 Correct 44 ms 2552 KB Output is correct
7 Correct 43 ms 2552 KB Output is correct
8 Correct 44 ms 2680 KB Output is correct
9 Correct 44 ms 2680 KB Output is correct
10 Correct 46 ms 2680 KB Output is correct
11 Correct 25 ms 2680 KB Output is correct
12 Correct 27 ms 2688 KB Output is correct
13 Correct 28 ms 2688 KB Output is correct
14 Correct 29 ms 2688 KB Output is correct
15 Correct 45 ms 2588 KB Output is correct
16 Correct 27 ms 2688 KB Output is correct
17 Correct 28 ms 2688 KB Output is correct
18 Correct 45 ms 2680 KB Output is correct
19 Correct 44 ms 2552 KB Output is correct
20 Correct 25 ms 2688 KB Output is correct
21 Correct 47 ms 2680 KB Output is correct
22 Correct 50 ms 2552 KB Output is correct
23 Correct 50 ms 2684 KB Output is correct
24 Correct 49 ms 2560 KB Output is correct
25 Correct 49 ms 2680 KB Output is correct
26 Correct 49 ms 2684 KB Output is correct
27 Correct 50 ms 2680 KB Output is correct
28 Correct 48 ms 2680 KB Output is correct
29 Correct 48 ms 2680 KB Output is correct
30 Correct 54 ms 2684 KB Output is correct
31 Correct 5 ms 384 KB Output is correct
32 Correct 4 ms 384 KB Output is correct
33 Incorrect 4 ms 384 KB Output isn't correct
34 Halted 0 ms 0 KB -