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Submission #427956

# Submission time Handle Problem Language Result Execution time Memory
427956 2021-06-15T06:06:15 Z cfalas Monochrome Points (JOI20_monochrome) C++14
35 / 100
 167 ms 2080 KB 
#include<bits/stdc++.h>
using namespace std;
#define mp make_pair
#define INF 10000000
#define MOD 1000000007
#define MID ((l+r)/2)
#define HASHMOD 2305843009213693951
#define ll long long
#define ull unsigned long long
#define F first
#define S second
typedef pair<ll, ll> ii;
typedef pair<ii, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef map<int, int> mii;

#define EPS 1e-6
#define FOR(i,n) for(int i=0;i<((int)(n));i++)
#define FORi(i,a,b) for(int i=((int)(a));i<((int)(b));i++)
#define FOA(v, a) for(auto v : a)

int t, n;
vi a, b;

int dist(int a, int b){
	return min(abs(a-b), abs(a-b+n));
}

int bp[40000];
int wp[40000];
int br(int l, int r){
	if(l>r) return 0;
	if(l==0) return bp[r];
	else return bp[r] - bp[l-1];
}
int wr(int l, int r){
	if(l>r) return 0;
	if(l==0) return wp[r];
	else return wp[r] - wp[l-1];
}

int main(){
	cin>>n;
	string s;
	cin>>s;
	n*=2;
	set<int> w, b;
	bp[0] = (s[0]=='B');
	FORi(i,1,n){
		bp[i] = bp[i-1];
		if(s[i]=='B') bp[i]++;
	}
	wp[0] = (s[0]=='W');
	FORi(i,1,n){
		wp[i] = wp[i-1];
		if(s[i]=='W') wp[i]++;
	}
	FOR(i,n){
		if(s[i]=='W') w.insert(i);
		else b.insert(i);
	}

	vi c(n);
	int bans=0;
	FORi(off,0, n/2+1){
		auto it = b.begin();
		FOR(i,off) it++;
		int ans=0;
		FOA(v,w){
			c[v] = *it;
			c[*it] = v;
			//cout<<v<<" "<<*it<<endl;
			// ans = min(b in range + w in other side, w in range + b in other side)
			int mi = min(v, *it);
			int ma = max(v, *it);
			ans += min(br(mi+1,ma-1) , (wr(0,mi-1) + wr(ma+1,n-1))) + min(br(0,mi-1) + br(ma+1,n-1) , (wr(mi+1,ma-1)));
			//cout<<v<<" "<<*it<<" "<<ans<<endl;

			it++;
			if(it==b.end()) it = b.begin();
		}
		//cout<<ans<<endl;
		/*
		FOR(i,n){
			if(s[i]=='B')
			FORi(j,min(i,c[i])+1, max(i,c[i])){
				if(c[j]>max(i,c[i]) || c[j]<min(i,c[i])) ans++;
			}
		}*/
		bans = max(bans, ans);
	}
	cout<<bans/2<<endl;
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 4 ms 332 KB Output is correct
15 Correct 4 ms 332 KB Output is correct
16 Correct 3 ms 204 KB Output is correct
17 Correct 4 ms 332 KB Output is correct
18 Correct 2 ms 332 KB Output is correct
19 Correct 2 ms 204 KB Output is correct
20 Correct 2 ms 332 KB Output is correct
21 Correct 2 ms 324 KB Output is correct
22 Correct 2 ms 204 KB Output is correct
23 Correct 2 ms 316 KB Output is correct
24 Correct 2 ms 204 KB Output is correct
25 Correct 2 ms 332 KB Output is correct
26 Correct 3 ms 332 KB Output is correct
27 Correct 2 ms 332 KB Output is correct
28 Correct 2 ms 332 KB Output is correct
29 Correct 2 ms 332 KB Output is correct
30 Correct 2 ms 332 KB Output is correct
31 Correct 3 ms 332 KB Output is correct
32 Correct 3 ms 332 KB Output is correct
33 Correct 3 ms 332 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 4 ms 332 KB Output is correct
15 Correct 4 ms 332 KB Output is correct
16 Correct 3 ms 204 KB Output is correct
17 Correct 4 ms 332 KB Output is correct
18 Correct 2 ms 332 KB Output is correct
19 Correct 2 ms 204 KB Output is correct
20 Correct 2 ms 332 KB Output is correct
21 Correct 2 ms 324 KB Output is correct
22 Correct 2 ms 204 KB Output is correct
23 Correct 2 ms 316 KB Output is correct
24 Correct 2 ms 204 KB Output is correct
25 Correct 2 ms 332 KB Output is correct
26 Correct 3 ms 332 KB Output is correct
27 Correct 2 ms 332 KB Output is correct
28 Correct 2 ms 332 KB Output is correct
29 Correct 2 ms 332 KB Output is correct
30 Correct 2 ms 332 KB Output is correct
31 Correct 3 ms 332 KB Output is correct
32 Correct 3 ms 332 KB Output is correct
33 Correct 3 ms 332 KB Output is correct
34 Correct 89 ms 524 KB Output is correct
35 Correct 109 ms 532 KB Output is correct
36 Correct 85 ms 524 KB Output is correct
37 Correct 80 ms 460 KB Output is correct
38 Correct 77 ms 460 KB Output is correct
39 Correct 83 ms 524 KB Output is correct
40 Correct 81 ms 496 KB Output is correct
41 Correct 68 ms 492 KB Output is correct
42 Correct 86 ms 460 KB Output is correct
43 Correct 96 ms 528 KB Output is correct
44 Correct 79 ms 504 KB Output is correct
45 Correct 78 ms 460 KB Output is correct
46 Correct 83 ms 432 KB Output is correct
47 Correct 87 ms 524 KB Output is correct
48 Correct 126 ms 528 KB Output is correct
49 Correct 78 ms 500 KB Output is correct
50 Correct 86 ms 532 KB Output is correct
51 Correct 90 ms 524 KB Output is correct
52 Correct 167 ms 432 KB Output is correct

Subtask #4
0.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 4 ms 332 KB Output is correct
15 Correct 4 ms 332 KB Output is correct
16 Correct 3 ms 204 KB Output is correct
17 Correct 4 ms 332 KB Output is correct
18 Correct 2 ms 332 KB Output is correct
19 Correct 2 ms 204 KB Output is correct
20 Correct 2 ms 332 KB Output is correct
21 Correct 2 ms 324 KB Output is correct
22 Correct 2 ms 204 KB Output is correct
23 Correct 2 ms 316 KB Output is correct
24 Correct 2 ms 204 KB Output is correct
25 Correct 2 ms 332 KB Output is correct
26 Correct 3 ms 332 KB Output is correct
27 Correct 2 ms 332 KB Output is correct
28 Correct 2 ms 332 KB Output is correct
29 Correct 2 ms 332 KB Output is correct
30 Correct 2 ms 332 KB Output is correct
31 Correct 3 ms 332 KB Output is correct
32 Correct 3 ms 332 KB Output is correct
33 Correct 3 ms 332 KB Output is correct
34 Correct 89 ms 524 KB Output is correct
35 Correct 109 ms 532 KB Output is correct
36 Correct 85 ms 524 KB Output is correct
37 Correct 80 ms 460 KB Output is correct
38 Correct 77 ms 460 KB Output is correct
39 Correct 83 ms 524 KB Output is correct
40 Correct 81 ms 496 KB Output is correct
41 Correct 68 ms 492 KB Output is correct
42 Correct 86 ms 460 KB Output is correct
43 Correct 96 ms 528 KB Output is correct
44 Correct 79 ms 504 KB Output is correct
45 Correct 78 ms 460 KB Output is correct
46 Correct 83 ms 432 KB Output is correct
47 Correct 87 ms 524 KB Output is correct
48 Correct 126 ms 528 KB Output is correct
49 Correct 78 ms 500 KB Output is correct
50 Correct 86 ms 532 KB Output is correct
51 Correct 90 ms 524 KB Output is correct
52 Correct 167 ms 432 KB Output is correct
53 Runtime error 13 ms 2080 KB Execution killed with signal 11
54 Halted 0 ms 0 KB -