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답안 #852104

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
852104 2023-09-21T08:32:25 Z danikoynov Chorus (JOI23_chorus) C++14
61 / 100
 7000 ms 12072 KB 
/**
 ____ ____ ____ ____ ____ ____
||l |||e |||i |||n |||a |||d ||
||__|||__|||__|||__|||__|||__||
|/__\|/__\|/__\|/__\|/__\|/__\|

**/

#include<bits/stdc++.h>
#define endl '\n'

using namespace std;
typedef long long ll;

void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}

const ll maxn = 1e6 + 10;
const ll inf = 1e18;

ll n, k;
string s;

ll pos[2][maxn], pref[maxn];
/// ll dp[maxn][maxn];
/**

*/

void chmin(ll &var, ll val) /// careful for long long
{
    var = min(var, val);
}


ll cost(ll left, ll right)
{
    if (left > right)
        return 0;

    ll above = (left - 1) * 2;
    ll lf = left, rf = right;
    while(lf <= rf)
    {
        ll mf = (lf + rf) / 2;
        if (pos[0][mf] > above + (mf - left + 1))
            rf = mf - 1;
        else
            lf = mf + 1;
    }

    ll sum = pref[right] - pref[lf - 1];
    sum = sum - (right - lf + 1) * above;
    ll len = right - left + 1;
    ll sm = lf - left;
    sum = sum - (len) * (len + 1) / 2;
    sum = sum + (sm) * (sm + 1) / 2;
    /**for (ll i = lf; i <= right; i ++)
    {

            sum = sum + pos[0][i] - (above + (i - left + 1));
    }*/
    return sum;

}

/**void divide(ll row, ll left, ll right, ll optl, ll optr)
{
    if (left > right)
        return;

    ll mid = (left + right) / 2;
    ll opt = -1;
    for (ll j = optl; j <= min(optr, mid); j ++)
    {
        ll cur = dp[j - 1][row - 1] + costd[j][mid];
        if (cur < dp[mid][row])
        {
            dp[mid][row] = cur;
            opt = j;
        }
    }

    divide(row, left, mid - 1, optl, opt);
    divide(row, mid + 1, right, opt, optr);
}*/



ll dp[maxn], f[maxn];

ll get_better(int i, int j)
{
    int lf = 1, rf = n;
    while(lf <= rf)
    {
        int mf = (lf + rf) / 2;
        if (dp[i - 1] + cost(i, mf) > dp[j - 1] + cost(j, mf))
            rf = mf - 1;
        else
            lf = mf + 1;
    }

    return lf;
}
pair < ll, ll > calc_dp(ll group_cost)
{
    for (int i = 1; i <= n; i ++)
    {
        dp[i] = inf;
        f[i] = 0;
    }
    deque < int > dq;
    for (int i = 1; i <= n; i ++)
    {
        while(dq.size() > 1)
        {
            int last = dq.back();
            int bef = dq[dq.size() - 2];
            if (get_better(last, i) < get_better(bef, last))
            {
                dq.pop_back();
            }
            else
            {
                break;
            }
        }
        dq.push_back(i);

        while(dq.size() > 1)
        {
            int fs = dq[0];
            int sc = dq[1];
            if (get_better(fs, sc) <= i)
                dq.pop_front();
            else
                break;
        }

        dp[i] = dp[dq[0] - 1] + cost(dq[0], i) + group_cost;
        f[i] = f[dq[0] - 1] + 1;

        /**for (int j = 1; j <= i; j ++)
        {
            ll cur = dp[j - 1] + cost(j, i) + group_cost;
            if (cur < dp[i])
            {
                dp[i] = cur;
                f[i] = f[j - 1] + 1;
            }
        }*/
    }


    return {dp[n], f[n]};
}
void solve()
{
    cin >> n >> k >> s;

    s = "#" + s;
    ll cntA = 0, cntB = 0;
    for (ll i = 1; i <= 2 * n; i ++)
    {
        if (s[i] == 'A')
        {
            cntA ++;
            pos[0][cntA] = i;
            pref[cntA] = pref[cntA - 1] + i;
        }
        else
        {
            cntB ++;
            pos[1][cntB] = i;
        }
    }

    ///for (ll i = 0; i <= n; i ++)
       // for (ll j = 0; j <= n; j ++)
         //   dp[i][j] = 4 * n * n; /// careful for overflow

    /**ll cr = 0;
    for (ll j = 1; j <= n; j ++)
    {
        cr = cr + pos[0][j] - j;

        dp[j][1] = cr;
    }

    for (ll j = 2; j <= k; j ++)

    {
        divide(j, j, n, j, n);
    }*/


    ll lf = 0, rf = n * n / 2;
    while(lf <= rf)
    {
        ll mf = (lf + rf) / 2;
        pair < ll, ll > cur = calc_dp(mf);
        if (cur.second <= k)
            rf = mf - 1;
        else
            lf = mf + 1;
    }

    if (rf < 0)
    {
        pair < ll, ll > cur = calc_dp(0);
        cout << cur.first << endl;
        return;
    }
    pair < ll, ll > fs = calc_dp(rf);
    pair < ll, ll > ds = calc_dp(rf + 1);

    ll fs_val = fs.first - fs.second * rf;
    ll ds_val = ds.first - ds.second * (rf + 1);

    double part = (double)(fs.second - k) / (double)(fs.second - ds.second); /// remember to cast
    double ans = (double)(fs_val) + part * (double)(ds_val - fs_val);
    ///cout << ds.first << "  " << ds.second << endl;
    ///cout << fs.first << "  " << fs.second << endl;
    cout << (ll)(round(ans)) << endl;
}

int main()
{
    speed();
    ///freopen("test.txt", "r", stdin);
    solve();
    return 0;
}

Subtask #1
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 1 ms 6492 KB Output is correct
13 Correct 1 ms 6488 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct

Subtask #2
24.0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 1 ms 6492 KB Output is correct
13 Correct 1 ms 6488 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 3 ms 6488 KB Output is correct
18 Correct 11 ms 6492 KB Output is correct
19 Correct 11 ms 6492 KB Output is correct
20 Correct 7 ms 6492 KB Output is correct
21 Correct 8 ms 6492 KB Output is correct
22 Correct 6 ms 6492 KB Output is correct
23 Correct 6 ms 6636 KB Output is correct
24 Correct 13 ms 6492 KB Output is correct
25 Correct 7 ms 6492 KB Output is correct
26 Correct 7 ms 6488 KB Output is correct
27 Correct 9 ms 6492 KB Output is correct
28 Correct 9 ms 6488 KB Output is correct

Subtask #3
21.0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 1 ms 6492 KB Output is correct
13 Correct 1 ms 6488 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 3 ms 6488 KB Output is correct
18 Correct 11 ms 6492 KB Output is correct
19 Correct 11 ms 6492 KB Output is correct
20 Correct 7 ms 6492 KB Output is correct
21 Correct 8 ms 6492 KB Output is correct
22 Correct 6 ms 6492 KB Output is correct
23 Correct 6 ms 6636 KB Output is correct
24 Correct 13 ms 6492 KB Output is correct
25 Correct 7 ms 6492 KB Output is correct
26 Correct 7 ms 6488 KB Output is correct
27 Correct 9 ms 6492 KB Output is correct
28 Correct 9 ms 6488 KB Output is correct
29 Correct 136 ms 6704 KB Output is correct
30 Correct 224 ms 6488 KB Output is correct
31 Correct 234 ms 6492 KB Output is correct
32 Correct 161 ms 6712 KB Output is correct
33 Correct 174 ms 6712 KB Output is correct
34 Correct 123 ms 6708 KB Output is correct
35 Correct 114 ms 6488 KB Output is correct
36 Correct 289 ms 6716 KB Output is correct
37 Correct 195 ms 6740 KB Output is correct
38 Correct 134 ms 6492 KB Output is correct
39 Correct 155 ms 6492 KB Output is correct
40 Correct 149 ms 6488 KB Output is correct
41 Correct 153 ms 6708 KB Output is correct
42 Correct 159 ms 6716 KB Output is correct

Subtask #4
0 / 26.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 1 ms 6492 KB Output is correct
13 Correct 1 ms 6488 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 3 ms 6488 KB Output is correct
18 Correct 11 ms 6492 KB Output is correct
19 Correct 11 ms 6492 KB Output is correct
20 Correct 7 ms 6492 KB Output is correct
21 Correct 8 ms 6492 KB Output is correct
22 Correct 6 ms 6492 KB Output is correct
23 Correct 6 ms 6636 KB Output is correct
24 Correct 13 ms 6492 KB Output is correct
25 Correct 7 ms 6492 KB Output is correct
26 Correct 7 ms 6488 KB Output is correct
27 Correct 9 ms 6492 KB Output is correct
28 Correct 9 ms 6488 KB Output is correct
29 Correct 136 ms 6704 KB Output is correct
30 Correct 224 ms 6488 KB Output is correct
31 Correct 234 ms 6492 KB Output is correct
32 Correct 161 ms 6712 KB Output is correct
33 Correct 174 ms 6712 KB Output is correct
34 Correct 123 ms 6708 KB Output is correct
35 Correct 114 ms 6488 KB Output is correct
36 Correct 289 ms 6716 KB Output is correct
37 Correct 195 ms 6740 KB Output is correct
38 Correct 134 ms 6492 KB Output is correct
39 Correct 155 ms 6492 KB Output is correct
40 Correct 149 ms 6488 KB Output is correct
41 Correct 153 ms 6708 KB Output is correct
42 Correct 159 ms 6716 KB Output is correct
43 Correct 5420 ms 9536 KB Output is correct
44 Execution timed out 7029 ms 12072 KB Time limit exceeded
45 Halted 0 ms 0 KB -

Subtask #5
0 / 13.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6492 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6492 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 1 ms 6492 KB Output is correct
12 Correct 1 ms 6492 KB Output is correct
13 Correct 1 ms 6488 KB Output is correct
14 Correct 1 ms 6492 KB Output is correct
15 Correct 1 ms 6492 KB Output is correct
16 Correct 1 ms 6492 KB Output is correct
17 Correct 3 ms 6488 KB Output is correct
18 Correct 11 ms 6492 KB Output is correct
19 Correct 11 ms 6492 KB Output is correct
20 Correct 7 ms 6492 KB Output is correct
21 Correct 8 ms 6492 KB Output is correct
22 Correct 6 ms 6492 KB Output is correct
23 Correct 6 ms 6636 KB Output is correct
24 Correct 13 ms 6492 KB Output is correct
25 Correct 7 ms 6492 KB Output is correct
26 Correct 7 ms 6488 KB Output is correct
27 Correct 9 ms 6492 KB Output is correct
28 Correct 9 ms 6488 KB Output is correct
29 Correct 136 ms 6704 KB Output is correct
30 Correct 224 ms 6488 KB Output is correct
31 Correct 234 ms 6492 KB Output is correct
32 Correct 161 ms 6712 KB Output is correct
33 Correct 174 ms 6712 KB Output is correct
34 Correct 123 ms 6708 KB Output is correct
35 Correct 114 ms 6488 KB Output is correct
36 Correct 289 ms 6716 KB Output is correct
37 Correct 195 ms 6740 KB Output is correct
38 Correct 134 ms 6492 KB Output is correct
39 Correct 155 ms 6492 KB Output is correct
40 Correct 149 ms 6488 KB Output is correct
41 Correct 153 ms 6708 KB Output is correct
42 Correct 159 ms 6716 KB Output is correct
43 Correct 5420 ms 9536 KB Output is correct
44 Execution timed out 7029 ms 12072 KB Time limit exceeded
45 Halted 0 ms 0 KB -