Submission #212140

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
212140	2020-03-22T10:44:02 Z	kshitij_sodani	Building 4 (JOI20_building4)	C++17	100 / 100	366 ms	29820 KB

building4

#include <iostream>
#include <bits/stdc++.h>
using namespace std;
typedef  long long llo;
#define mp make_pair
#define pb push_back
#define a first
#define b second
#define endl "\n"
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int n;
	cin>>n;
	int aa[2*n];
	int bb[2*n];
	for(int i=0;i<2*n;i++){
		cin>>aa[i];
	}	
	for(int i=0;i<2*n;i++){
		cin>>bb[i];
	}
	pair<int,int> dp[2*n][2];
	dp[0][0]={1,1};
	dp[0][1]={0,0};
	for(int i=1;i<2*n;i++){
		int st=0;
		dp[i][0]={-1,-1};
		dp[i][1]={-1,-1};
		if(aa[i]>=aa[i-1]){
			if(dp[i-1][0].a!=-1){
				dp[i][0]={dp[i-1][0].a+1,dp[i-1][0].b+1};
				st=1;
			}
		}
		if(aa[i]>=bb[i-1]){
			if(dp[i-1][1].a!=-1){
				if(st==0){
					dp[i][0]={dp[i-1][1].a+1,dp[i-1][1].b+1};
					st=1;
				}
				else{
					dp[i][0].a=min(dp[i][0].a,dp[i-1][1].a+1);
					dp[i][0].b=max(dp[i][0].b,dp[i-1][1].b+1);
					st=1;
				}
			}
		}
		
		int stt=0;
		if(bb[i]>=aa[i-1]){
			if(dp[i-1][0].a!=-1){
				dp[i][1]=dp[i-1][0];

				stt=1;
			}
		}
		if(bb[i]>=bb[i-1]){
			if(dp[i-1][1].a!=-1){
				if(stt==0){
					dp[i][1]=dp[i-1][1];
				}
				else{
					dp[i][1].a=min(dp[i][1].a,dp[i-1][1].a);
					dp[i][1].b=max(dp[i][1].b,dp[i-1][1].b);
				}
			}
		}
	}
	int ans[2*n];
	int so=-1;

	if(dp[2*n-1][0].a<=n and dp[2*n-1][0].b>=n){
		so=0;
	}
	if(dp[2*n-1][1].a<=n and dp[2*n-1][1].b>=n){
		so=1;
	}

	if(so==-1){
		cout<<-1;
		return 0;
	}
	ans[2*n-1]=so;
	int co=n-(1-so);

	for(int i=2*n-2;i>=0;i--){
		int soo;
		int x=aa[i+1];
		if(ans[i+1]==1){
			x=bb[i+1];
		}
		if( dp[i][0].a<=co and dp[i][0].b>=co and aa[i]<=x and co>0){
			soo=0;
			co-=1;
		}
		else if(dp[i][1].a<=co and dp[i][1].b>=co and bb[i]<=x){
			soo=1;
		}
		ans[i]=soo;
	}
	for(int i=0;i<2*n;i++){
		if(ans[i]==0){
			cout<<"A";
		}
		else{
			cout<<"B";
		}
	}




	return 0;
}

Compilation message

building4.cpp: In function 'int main()':
building4.cpp:100:9: warning: 'soo' may be used uninitialized in this function [-Wmaybe-uninitialized]
   ans[i]=soo;
   ~~~~~~^~~~

Subtask #1

11.0 / 11.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	5 ms	384 KB	Output is correct
2	Correct	4 ms	384 KB	Output is correct
3	Correct	5 ms	384 KB	Output is correct
4	Correct	4 ms	384 KB	Output is correct
5	Correct	6 ms	512 KB	Output is correct
6	Correct	6 ms	512 KB	Output is correct
7	Correct	6 ms	512 KB	Output is correct
8	Correct	6 ms	512 KB	Output is correct
9	Correct	6 ms	512 KB	Output is correct
10	Correct	7 ms	632 KB	Output is correct
11	Correct	6 ms	512 KB	Output is correct
12	Correct	6 ms	512 KB	Output is correct
13	Correct	6 ms	512 KB	Output is correct
14	Correct	6 ms	512 KB	Output is correct
15	Correct	7 ms	512 KB	Output is correct
16	Correct	6 ms	512 KB	Output is correct
17	Correct	6 ms	512 KB	Output is correct
18	Correct	6 ms	512 KB	Output is correct
19	Correct	6 ms	512 KB	Output is correct
20	Correct	5 ms	512 KB	Output is correct
21	Correct	6 ms	512 KB	Output is correct
22	Correct	6 ms	512 KB	Output is correct
23	Correct	6 ms	512 KB	Output is correct
24	Correct	6 ms	512 KB	Output is correct
25	Correct	5 ms	512 KB	Output is correct
26	Correct	5 ms	512 KB	Output is correct
27	Correct	5 ms	512 KB	Output is correct
28	Correct	5 ms	512 KB	Output is correct
29	Correct	6 ms	512 KB	Output is correct
30	Correct	5 ms	512 KB	Output is correct
31	Correct	7 ms	640 KB	Output is correct
32	Correct	6 ms	512 KB	Output is correct
33	Correct	5 ms	512 KB	Output is correct

Subtask #2

89.0 / 89.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	5 ms	384 KB	Output is correct
2	Correct	4 ms	384 KB	Output is correct
3	Correct	5 ms	384 KB	Output is correct
4	Correct	4 ms	384 KB	Output is correct
5	Correct	6 ms	512 KB	Output is correct
6	Correct	6 ms	512 KB	Output is correct
7	Correct	6 ms	512 KB	Output is correct
8	Correct	6 ms	512 KB	Output is correct
9	Correct	6 ms	512 KB	Output is correct
10	Correct	7 ms	632 KB	Output is correct
11	Correct	6 ms	512 KB	Output is correct
12	Correct	6 ms	512 KB	Output is correct
13	Correct	6 ms	512 KB	Output is correct
14	Correct	6 ms	512 KB	Output is correct
15	Correct	7 ms	512 KB	Output is correct
16	Correct	6 ms	512 KB	Output is correct
17	Correct	6 ms	512 KB	Output is correct
18	Correct	6 ms	512 KB	Output is correct
19	Correct	6 ms	512 KB	Output is correct
20	Correct	5 ms	512 KB	Output is correct
21	Correct	6 ms	512 KB	Output is correct
22	Correct	6 ms	512 KB	Output is correct
23	Correct	6 ms	512 KB	Output is correct
24	Correct	6 ms	512 KB	Output is correct
25	Correct	5 ms	512 KB	Output is correct
26	Correct	5 ms	512 KB	Output is correct
27	Correct	5 ms	512 KB	Output is correct
28	Correct	5 ms	512 KB	Output is correct
29	Correct	6 ms	512 KB	Output is correct
30	Correct	5 ms	512 KB	Output is correct
31	Correct	7 ms	640 KB	Output is correct
32	Correct	6 ms	512 KB	Output is correct
33	Correct	5 ms	512 KB	Output is correct
34	Correct	308 ms	24440 KB	Output is correct
35	Correct	335 ms	26744 KB	Output is correct
36	Correct	337 ms	26360 KB	Output is correct
37	Correct	352 ms	26876 KB	Output is correct
38	Correct	323 ms	26876 KB	Output is correct
39	Correct	319 ms	28064 KB	Output is correct
40	Correct	346 ms	29688 KB	Output is correct
41	Correct	315 ms	27432 KB	Output is correct
42	Correct	327 ms	28536 KB	Output is correct
43	Correct	345 ms	28796 KB	Output is correct
44	Correct	359 ms	28792 KB	Output is correct
45	Correct	348 ms	29688 KB	Output is correct
46	Correct	344 ms	28792 KB	Output is correct
47	Correct	330 ms	28792 KB	Output is correct
48	Correct	339 ms	28792 KB	Output is correct
49	Correct	341 ms	28792 KB	Output is correct
50	Correct	338 ms	29820 KB	Output is correct
51	Correct	347 ms	29688 KB	Output is correct
52	Correct	226 ms	29304 KB	Output is correct
53	Correct	219 ms	29176 KB	Output is correct
54	Correct	198 ms	29176 KB	Output is correct
55	Correct	213 ms	29432 KB	Output is correct
56	Correct	332 ms	29560 KB	Output is correct
57	Correct	315 ms	28920 KB	Output is correct
58	Correct	302 ms	29052 KB	Output is correct
59	Correct	298 ms	29048 KB	Output is correct
60	Correct	282 ms	27348 KB	Output is correct
61	Correct	290 ms	29048 KB	Output is correct
62	Correct	366 ms	28536 KB	Output is correct
63	Correct	288 ms	29048 KB	Output is correct
64	Correct	285 ms	28024 KB	Output is correct
65	Correct	294 ms	29048 KB	Output is correct