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Submission #614051

# Submission time Handle Problem Language Result Execution time Memory
614051 2022-07-30T17:25:58 Z MohamedAliSaidane Monochrome Points (JOI20_monochrome) C++14
35 / 100
 1077 ms 10260 KB 
#include<bits/stdc++.h>

    using namespace std;

    typedef long long ll;

    typedef pair<int,int> pii;
    typedef pair<ll,ll> pll;

    typedef vector<int> vi;
    typedef vector<ll> vll;
    typedef vector<pii> vpi;
    typedef vector<pll> vpl;

    #define pb push_back
    #define popb pop_back
    #define all(x) (x).begin(), (x).end()


    #define ff first
    #define ss second

    const int nax = 4e5 + 4;
    int n;
    int col[nax];
    ll dp[nax];
    vi perm, ot;

    struct FenwickTree
    {
        vector<int> bit;  // binary indexed tree
        int n;

        FenwickTree(int n) {
            this->n = n;
            bit.assign(n, 0);
        }

        FenwickTree(vector<int> a) : FenwickTree(a.size()) {
            for (size_t i = 0; i < a.size(); i++)
                add(i, a[i]);
        }

        int sum(int r) {
            int ret = 0;
            for (; r >= 0; r = (r & (r + 1)) - 1)
                ret += bit[r];
            return ret;
        }

        int sum(int l, int r) {
            return sum(r) - sum(l - 1);
        }

        void add(int idx, int delta) {
            for (; idx < n; idx = idx | (idx + 1))
                bit[idx] += delta;
        }
    };

    int compute(int x)
    {
        if(x >= n)
            return 0 ;
        if(dp[x] != -1)
            return dp[x];
        vpi inter;
        ll rep = 0;
        for(int i=  0 ; i < n; i++)
        {
            int a = perm[(i + x)%n];
            int b = ot[i];
            inter.pb({min(a,b), max(a,b)});
        }
        sort(all(inter));
        reverse(all(inter));
        FenwickTree fen = FenwickTree(2 * n);
        for(int i=  0 ; i < n; i++)
        {
            int a = inter[i].ff;
            int b=  inter[i].ss;
            rep += (ll)(fen.sum(a,b));
            fen.add(a, 1);
            fen.add(b, -1);
        }
        return dp[x] = rep;

    }
    int32_t main()
    {
        ios::sync_with_stdio(false);
        cin.tie(0); cout.tie(0);
        memset(dp, -1,sizeof(dp));
        cin >> n;
        for(int i  = 0 ; i < 2 * n ; i++)
        {
            char c; cin >> c;
            if(c == 'B')
                col[i] = 1;
            if(col[i])
                perm.pb(i);
            else
                ot.pb(i);
        }
        int ans = 0 ;
        int debut = 0;
        int fin = n - 1;
        int rep = debut;
        while(debut <= fin )
        {
            int mid = (debut + fin)/2;
            //cout << mid << ' ' << compute(mid) << ' ' << compute(mid + 1) << "\n";
            if(compute(mid + 1) > compute(mid))
            {
                rep = mid + 1;
                debut = mid + 1;
                ans = max(ans, compute(mid + 1));
            }
            else
            {
                rep = mid ;
                fin = mid - 1;
                ans = max(ans, compute(mid ));
            }
        }
        cout << ans;
    }

Compilation message

monochrome.cpp: In function 'int32_t main()':
monochrome.cpp:108:13: warning: variable 'rep' set but not used [-Wunused-but-set-variable]
  108 |         int rep = debut;
      |             ^~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 3412 KB Output is correct
2 Correct 2 ms 3412 KB Output is correct
3 Correct 2 ms 3412 KB Output is correct
4 Correct 3 ms 3412 KB Output is correct
5 Correct 2 ms 3412 KB Output is correct
6 Correct 2 ms 3412 KB Output is correct
7 Correct 2 ms 3412 KB Output is correct
8 Correct 3 ms 3412 KB Output is correct
9 Correct 2 ms 3412 KB Output is correct
10 Correct 2 ms 3412 KB Output is correct
11 Correct 2 ms 3412 KB Output is correct
12 Correct 2 ms 3412 KB Output is correct
13 Correct 2 ms 3412 KB Output is correct

Subtask #2
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 3412 KB Output is correct
2 Correct 2 ms 3412 KB Output is correct
3 Correct 2 ms 3412 KB Output is correct
4 Correct 3 ms 3412 KB Output is correct
5 Correct 2 ms 3412 KB Output is correct
6 Correct 2 ms 3412 KB Output is correct
7 Correct 2 ms 3412 KB Output is correct
8 Correct 3 ms 3412 KB Output is correct
9 Correct 2 ms 3412 KB Output is correct
10 Correct 2 ms 3412 KB Output is correct
11 Correct 2 ms 3412 KB Output is correct
12 Correct 2 ms 3412 KB Output is correct
13 Correct 2 ms 3412 KB Output is correct
14 Correct 3 ms 3412 KB Output is correct
15 Correct 2 ms 3412 KB Output is correct
16 Correct 4 ms 3412 KB Output is correct
17 Correct 4 ms 3412 KB Output is correct
18 Correct 3 ms 3460 KB Output is correct
19 Correct 2 ms 3412 KB Output is correct
20 Correct 3 ms 3432 KB Output is correct
21 Correct 2 ms 3412 KB Output is correct
22 Correct 2 ms 3412 KB Output is correct
23 Correct 2 ms 3412 KB Output is correct
24 Correct 2 ms 3412 KB Output is correct
25 Correct 3 ms 3412 KB Output is correct
26 Correct 3 ms 3412 KB Output is correct
27 Correct 4 ms 3412 KB Output is correct
28 Correct 2 ms 3412 KB Output is correct
29 Correct 3 ms 3412 KB Output is correct
30 Correct 2 ms 3412 KB Output is correct
31 Correct 2 ms 3412 KB Output is correct
32 Correct 3 ms 3412 KB Output is correct
33 Correct 2 ms 3412 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 3412 KB Output is correct
2 Correct 2 ms 3412 KB Output is correct
3 Correct 2 ms 3412 KB Output is correct
4 Correct 3 ms 3412 KB Output is correct
5 Correct 2 ms 3412 KB Output is correct
6 Correct 2 ms 3412 KB Output is correct
7 Correct 2 ms 3412 KB Output is correct
8 Correct 3 ms 3412 KB Output is correct
9 Correct 2 ms 3412 KB Output is correct
10 Correct 2 ms 3412 KB Output is correct
11 Correct 2 ms 3412 KB Output is correct
12 Correct 2 ms 3412 KB Output is correct
13 Correct 2 ms 3412 KB Output is correct
14 Correct 3 ms 3412 KB Output is correct
15 Correct 2 ms 3412 KB Output is correct
16 Correct 4 ms 3412 KB Output is correct
17 Correct 4 ms 3412 KB Output is correct
18 Correct 3 ms 3460 KB Output is correct
19 Correct 2 ms 3412 KB Output is correct
20 Correct 3 ms 3432 KB Output is correct
21 Correct 2 ms 3412 KB Output is correct
22 Correct 2 ms 3412 KB Output is correct
23 Correct 2 ms 3412 KB Output is correct
24 Correct 2 ms 3412 KB Output is correct
25 Correct 3 ms 3412 KB Output is correct
26 Correct 3 ms 3412 KB Output is correct
27 Correct 4 ms 3412 KB Output is correct
28 Correct 2 ms 3412 KB Output is correct
29 Correct 3 ms 3412 KB Output is correct
30 Correct 2 ms 3412 KB Output is correct
31 Correct 2 ms 3412 KB Output is correct
32 Correct 3 ms 3412 KB Output is correct
33 Correct 2 ms 3412 KB Output is correct
34 Correct 6 ms 3540 KB Output is correct
35 Correct 6 ms 3540 KB Output is correct
36 Correct 6 ms 3540 KB Output is correct
37 Correct 7 ms 3540 KB Output is correct
38 Correct 4 ms 3548 KB Output is correct
39 Correct 5 ms 3540 KB Output is correct
40 Correct 6 ms 3540 KB Output is correct
41 Correct 5 ms 3540 KB Output is correct
42 Correct 6 ms 3540 KB Output is correct
43 Correct 7 ms 3412 KB Output is correct
44 Correct 6 ms 3540 KB Output is correct
45 Correct 5 ms 3540 KB Output is correct
46 Correct 5 ms 3540 KB Output is correct
47 Correct 5 ms 3540 KB Output is correct
48 Correct 5 ms 3544 KB Output is correct
49 Correct 4 ms 3532 KB Output is correct
50 Correct 5 ms 3412 KB Output is correct
51 Correct 4 ms 3412 KB Output is correct
52 Correct 6 ms 3540 KB Output is correct

Subtask #4
0.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 3412 KB Output is correct
2 Correct 2 ms 3412 KB Output is correct
3 Correct 2 ms 3412 KB Output is correct
4 Correct 3 ms 3412 KB Output is correct
5 Correct 2 ms 3412 KB Output is correct
6 Correct 2 ms 3412 KB Output is correct
7 Correct 2 ms 3412 KB Output is correct
8 Correct 3 ms 3412 KB Output is correct
9 Correct 2 ms 3412 KB Output is correct
10 Correct 2 ms 3412 KB Output is correct
11 Correct 2 ms 3412 KB Output is correct
12 Correct 2 ms 3412 KB Output is correct
13 Correct 2 ms 3412 KB Output is correct
14 Correct 3 ms 3412 KB Output is correct
15 Correct 2 ms 3412 KB Output is correct
16 Correct 4 ms 3412 KB Output is correct
17 Correct 4 ms 3412 KB Output is correct
18 Correct 3 ms 3460 KB Output is correct
19 Correct 2 ms 3412 KB Output is correct
20 Correct 3 ms 3432 KB Output is correct
21 Correct 2 ms 3412 KB Output is correct
22 Correct 2 ms 3412 KB Output is correct
23 Correct 2 ms 3412 KB Output is correct
24 Correct 2 ms 3412 KB Output is correct
25 Correct 3 ms 3412 KB Output is correct
26 Correct 3 ms 3412 KB Output is correct
27 Correct 4 ms 3412 KB Output is correct
28 Correct 2 ms 3412 KB Output is correct
29 Correct 3 ms 3412 KB Output is correct
30 Correct 2 ms 3412 KB Output is correct
31 Correct 2 ms 3412 KB Output is correct
32 Correct 3 ms 3412 KB Output is correct
33 Correct 2 ms 3412 KB Output is correct
34 Correct 6 ms 3540 KB Output is correct
35 Correct 6 ms 3540 KB Output is correct
36 Correct 6 ms 3540 KB Output is correct
37 Correct 7 ms 3540 KB Output is correct
38 Correct 4 ms 3548 KB Output is correct
39 Correct 5 ms 3540 KB Output is correct
40 Correct 6 ms 3540 KB Output is correct
41 Correct 5 ms 3540 KB Output is correct
42 Correct 6 ms 3540 KB Output is correct
43 Correct 7 ms 3412 KB Output is correct
44 Correct 6 ms 3540 KB Output is correct
45 Correct 5 ms 3540 KB Output is correct
46 Correct 5 ms 3540 KB Output is correct
47 Correct 5 ms 3540 KB Output is correct
48 Correct 5 ms 3544 KB Output is correct
49 Correct 4 ms 3532 KB Output is correct
50 Correct 5 ms 3412 KB Output is correct
51 Correct 4 ms 3412 KB Output is correct
52 Correct 6 ms 3540 KB Output is correct
53 Incorrect 1077 ms 10260 KB Output isn't correct
54 Halted 0 ms 0 KB -