oj.uz

Submission #332699

# Submission time Handle Problem Language Result Execution time Memory
332699 2020-12-03T03:39:26 Z limabeans JJOOII 2 (JOI20_ho_t2) C++17
100 / 100
 35 ms 4056 KB 
#include <bits/stdc++.h>
using namespace std;

template<typename T>
void out(T x) { cout << x << endl; exit(0); }
#define watch(x) cout << (#x) << " is " << (x) << endl





using ll = long long;


const int maxn = 1e6 + 5;




int n,k;
string s;
int a[maxn];
int acc[maxn][3];

int main() {
    ios_base::sync_with_stdio(false); cin.tie(0);  cout.tie(0);

    cin>>n>>k;
    cin>>s;
    for (int i=0; i<n; i++) {
	if (s[i]=='J') {
	    a[i+1]=0;
	} else if (s[i]=='O') {
	    a[i+1]=1;
	} else if (s[i]=='I') {
	    a[i+1]=2;
	} else assert(false);
    }

    for (int i=1; i<=n; i++) {
	acc[i][a[i]]++;
	for (int j=0; j<3; j++) {
	    acc[i][j] += acc[i-1][j];
	}
    }


    auto qry = [&](int l, int r, int i) {
	return acc[r][i] - acc[l-1][i];
    };


    int res = 2*n;

    for (int i=1; i<=n; i++) {
	if (a[i]==1) {
	    if (qry(1,i,0)<k || qry(i,n,1)<k || qry(1,n,2)<k) {
		continue;
	    }

	    int L = -1, R = -1;

	    // reach back for J
	    {
		int lo = 1;
		int hi = i+1;
		while (hi-lo>1) {
		    int mid=(lo+hi)/2;
		    if (qry(mid,i,0)>=k) {
			lo = mid;
		    } else {
			hi = mid;
		    }
		}

		L = lo;
	    }


	    int I = -1;
	    // find kth I
	    {
		int lo = i-1;
		int hi = n;
		while (hi-lo>1) {
		    int mid=(lo+hi)/2;
		    if (qry(i,mid,1)>=k) {
			hi = mid;
		    } else {
			lo = mid;
		    }
		}

		I = hi;
	    }

	    if (qry(I,n,2)<k) {
		continue;
	    }

	    // find kth O
	    {
		int lo = I-1;
		int hi = n;
		while (hi-lo>1) {
		    int mid=(lo+hi)/2;
		    if (qry(I,mid,2)>=k) {
			hi = mid;
		    } else {
			lo = mid;
		    }
		}

		R = hi;
	    }

	    // watch(i);
	    // cout<<L<<" "<<I<<" "<<R<<endl;
	    int cur = (R-L+1) - 3*k;
	    res = min(res, cur);
	}
    }
    

    if (res>n) res=-1;
    cout<<res<<endl;
    
    return 0;
}

Subtask #1
1.0 / 1.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 1 ms 364 KB Output is correct
18 Correct 1 ms 364 KB Output is correct
19 Correct 1 ms 364 KB Output is correct
20 Correct 1 ms 364 KB Output is correct
21 Correct 1 ms 364 KB Output is correct
22 Correct 2 ms 364 KB Output is correct
23 Correct 1 ms 364 KB Output is correct
24 Correct 1 ms 364 KB Output is correct
25 Correct 1 ms 364 KB Output is correct
26 Correct 1 ms 364 KB Output is correct
27 Correct 1 ms 364 KB Output is correct
28 Correct 1 ms 364 KB Output is correct
29 Correct 1 ms 364 KB Output is correct
30 Correct 1 ms 364 KB Output is correct
31 Correct 1 ms 384 KB Output is correct
32 Correct 1 ms 364 KB Output is correct
33 Correct 1 ms 364 KB Output is correct
34 Correct 1 ms 364 KB Output is correct
35 Correct 1 ms 364 KB Output is correct

Subtask #3
87.0 / 87.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 364 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 1 ms 364 KB Output is correct
11 Correct 1 ms 364 KB Output is correct
12 Correct 1 ms 364 KB Output is correct
13 Correct 1 ms 364 KB Output is correct
14 Correct 1 ms 364 KB Output is correct
15 Correct 1 ms 364 KB Output is correct
16 Correct 1 ms 364 KB Output is correct
17 Correct 1 ms 364 KB Output is correct
18 Correct 1 ms 364 KB Output is correct
19 Correct 1 ms 364 KB Output is correct
20 Correct 1 ms 364 KB Output is correct
21 Correct 1 ms 364 KB Output is correct
22 Correct 2 ms 364 KB Output is correct
23 Correct 1 ms 364 KB Output is correct
24 Correct 1 ms 364 KB Output is correct
25 Correct 1 ms 364 KB Output is correct
26 Correct 1 ms 364 KB Output is correct
27 Correct 1 ms 364 KB Output is correct
28 Correct 1 ms 364 KB Output is correct
29 Correct 1 ms 364 KB Output is correct
30 Correct 1 ms 364 KB Output is correct
31 Correct 1 ms 384 KB Output is correct
32 Correct 1 ms 364 KB Output is correct
33 Correct 1 ms 364 KB Output is correct
34 Correct 1 ms 364 KB Output is correct
35 Correct 1 ms 364 KB Output is correct
36 Correct 24 ms 3576 KB Output is correct
37 Correct 35 ms 3832 KB Output is correct
38 Correct 27 ms 3832 KB Output is correct
39 Correct 28 ms 3704 KB Output is correct
40 Correct 13 ms 3960 KB Output is correct
41 Correct 23 ms 3960 KB Output is correct
42 Correct 28 ms 3960 KB Output is correct
43 Correct 7 ms 2668 KB Output is correct
44 Correct 8 ms 3192 KB Output is correct
45 Correct 13 ms 3960 KB Output is correct
46 Correct 12 ms 3960 KB Output is correct
47 Correct 11 ms 3960 KB Output is correct
48 Correct 11 ms 3960 KB Output is correct
49 Correct 9 ms 2808 KB Output is correct
50 Correct 12 ms 3960 KB Output is correct
51 Correct 11 ms 4012 KB Output is correct
52 Correct 7 ms 3880 KB Output is correct
53 Correct 7 ms 3960 KB Output is correct
54 Correct 25 ms 4056 KB Output is correct
55 Correct 11 ms 3960 KB Output is correct
56 Correct 5 ms 3960 KB Output is correct