Submission #452054

#	Time	Username	Problem	Language	Result	Execution time	Memory
452054		fskarica	Exam (eJOI20_exam)	C++14	0 / 100	3 ms	588 KiB

exam

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define fi first
#define se second
#define pii pair<int, int>

const int MAX = 2020;
int n;
int x, y;
int v, pos;
int a, b;
int arra[MAX];
int arrb[MAX];
int prf[MAX];
int prfmax[MAX];
int suf[MAX];
int sufmax[MAX];
vector <pii> ve;

void clean() {
    for (int i = 0; i <= n + 1; i++) {
        prf[i] = 0;
        prfmax[i] = 0;
        suf[i] = 0;
        sufmax[i] = 0;
    }
}

int main() {
    cin >> n;

    for (int i = 1; i <= n; i++) {
        cin >> arra[i];

        ve.push_back({arra[i], i});
    }

    for (int i = 1; i <= n; i++) {
        cin >> arrb[i];
    }

    sort(ve.begin(), ve.end());
    for (auto e : ve) {
//        cout << e.fi << " " << e.se << "\n";

        clean();
        v = e.fi;
        a = e.se;

        pos = a + 1;
        while (1) {
            if (pos > n) break;
            if (arra[pos] >= v) break;
            pos++;
        }
        pos--;

//        cout << a << " " << pos << "\n";

        for (int i = a + 1; i <= pos; i++) {
            prf[i - a] = prf[i - a - 1];
            if (arra[i] == arrb[i]) prf[i - a]--;
            if (v == arrb[i]) prf[i - a]++;
        }

        for (int i = pos; i >= a + 1; i--) {
            suf[i - a] = suf[i - a + 1];
            if (arra[i] == arrb[i]) suf[i - a]--;
            if (v == arrb[i]) suf[i - a]++;
        }

        for (int i = 1; i <= pos - a; i++) prfmax[i] = max(prfmax[i - 1], prf[i]);
        for (int i = pos - a; i >= 1; i--) sufmax[i] = max(sufmax[i + 1], suf[i]);

        if (arra[pos + 1] == arra[a]) {
//            cout << "uso11\n";
//            for (int i = 1; i <= pos - a; i++) cout << prf[i] << " "; cout << " !\n";
//            for (int i = 1; i <= pos - a; i++) cout << prfmax[i] << " "; cout << " !\n";
//            for (int i = 1; i <= pos - a; i++) cout << suf[i] << " "; cout << " !\n";
//            for (int i = 1; i <= pos - a; i++) cout << sufmax[i] << " "; cout << " !\n";

            x = 0;
            y = 0;
            for (int i = 1; i <= pos - a; i++) {
                if (prfmax[i] + sufmax[i + 1] > x + y) {
                    x = prfmax[i];
                    y = sufmax[i + 1];
                }
            }

//            cout << x << " " << y << " x y\n";

            for (int i = a + 1; i <= pos; i++) {
                arra[i] = v;
                if (prf[i - a] == x) break;
            }

            for (int i = pos; i >= a + 1; i--) {
                arra[i] = v;
                if (suf[i - a] == y) break;
            }
        }
        else {
            x = prfmax[pos - a];

            for (int i = a + 1; i <= pos; i++) {
                if (x == 0) break;
                arra[i] = v;
                if (prf[i - a] == x) break;
            }
        }

        /////////////////////////////////////

        clean();
        v = e.fi;
        a = e.se;

        pos = a - 1;
        while (1) {
            if (pos < 1) break;
            if (arra[pos] >= v) break;
            pos--;
        }
        pos++;

        swap(pos, a);
        pos--;
        a--;

//        cout << a << " " << pos << "\n";

        for (int i = a + 1; i <= pos; i++) {
            prf[i - a] = prf[i - a - 1];
            if (arra[i] == arrb[i]) prf[i - a]--;
            if (v == arrb[i]) prf[i - a]++;
        }

        for (int i = pos; i >= a + 1; i--) {
            suf[i - a] = suf[i - a + 1];
            if (arra[i] == arrb[i]) suf[i - a]--;
            if (v == arrb[i]) suf[i - a]++;
        }

        for (int i = 1; i <= pos - a; i++) prfmax[i] = max(prfmax[i - 1], prf[i]);
        for (int i = pos - a; i >= 1; i--) sufmax[i] = max(sufmax[i + 1], suf[i]);

        if (arra[pos + 1] == arra[a]) {
//            cout << "uso12\n";
//            for (int i = 1; i <= pos - a; i++) cout << prf[i] << " "; cout << " !\n";
//            for (int i = 1; i <= pos - a; i++) cout << prfmax[i] << " "; cout << " !\n";
//            for (int i = 1; i <= pos - a; i++) cout << suf[i] << " "; cout << " !\n";
//            for (int i = 1; i <= pos - a; i++) cout << sufmax[i] << " "; cout << " !\n";

            x = 0;
            y = 0;
            for (int i = 1; i <= pos - a; i++) {
                if (prfmax[i] + sufmax[i + 1] > x + y) {
                    x = prfmax[i];
                    y = sufmax[i + 1];
                }
            }

            for (int i = a + 1; i <= pos; i++) {
                arra[i] = v;
                if (prf[i - a] == x) break;
            }

            for (int i = pos; i >= a + 1; i--) {
                arra[i] = v;
                if (suf[i - a] == y) break;
            }
        }
        else {
//            cout << "uso22\n";
//            for (int i = 1; i <= pos - a; i++) cout << prf[i] << " "; cout << "\n";
//            for (int i = 1; i <= pos - a; i++) cout << prfmax[i] << " "; cout << "\n";
//            for (int i = 1; i <= pos - a; i++) cout << suf[i] << " "; cout << "\n";
//            for (int i = 1; i <= pos - a; i++) cout << sufmax[i] << " "; cout << "\n";


            x = sufmax[pos - a];

            for (int i = pos; i >= a + 1; i--) {
                if (x == 0) break;
                arra[i] = v;
                if (suf[i - a] == x) break;
            }
        }

//        for (int i = 1; i <= n; i++) {
//            cout << arra[i] << " ";
//        }
//        cout << "\n";
//        cout << "\n";
    }

    int sol = 0;
    for (int i = 1; i <= n; i++) {
        if (arra[i] == arrb[i]) sol++;
    }

    cout << sol << "\n";

    return 0;
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 23
• Subtask 5: 0 / 16
• Subtask 6: 0 / 22