oj.uz

Submission #230175

# Submission time Handle Problem Language Result Execution time Memory
230175 2020-05-08T21:23:02 Z DS007 Lamps (JOI19_lamps) C++14
4 / 100
 28 ms 5648 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long

int n, n_;
string a, b, a_, b_;

int toggle(int p) {
    while (p != n_ && a_[p] != 2 && a_[p] != b_[p])
        p++;
    return p;
}

int find(int l, int r) {
    while (l != r && a_[l] == b_[l])
        l++;

    r--;
    while (l <= r && a_[r] == b_[r])
        r--;

    if (l > r)
        return 0;

    int change = 0;
    for (int i = l; i <= r; i++) {
        if (b_[i] != b_[l] && b_[i] != b_[i - 1])
            change++;
    }
    return change + 1;
}

bool check(int p) {
    bool ans = true;
    int temp = p--;
    while (p >= 0 && b_[p] == b_[temp]) {
        if (a_[p] != b[p])
            ans = false;
        p--;
    }
    return ans;
}

int solve(int lp) {
    while (lp != n_ && a_[lp] == b_[lp])
        lp++;
    if (lp == n_)
        return 0;
    if (lp == n_ - 1)
        return 1;

    int last = n_, change = 0;
    for (int p = lp; p < n_; p++) {
        if (b_[p] != b_[lp] && b_[p] == a_[p] && (p == n - 1 || b_[p] != b_[p + 1]))
            return 1 + change + solve(p);
        if (b_[p] != b_[lp] && b_[p] != b_[p - 1])
            change++;
        if (a_[p] == b_[p])
            last = n_;
        else if (last == n_)
            last = p;
        if (last < p - 1 && b_[p] != b_[lp] && check(p - 2))
            return find(lp, last) + 1 + solve(toggle(last));
    }

    return last == lp ? 1 : 1 + change;
}

int solveTestCase(int test) {
    cin >> n >> a >> b;

    for (int i = 0; i < n; n_++) {
        int temp = i;

        while (temp != n && b[temp] == b[i] && a[temp] == a[i])
            temp++;

        b_ += b[i];
        a_ += a[i];
        i = temp;
    }

    //cout << a_ << endl << b_ << endl;
    cout << solve(0);
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    int test = 1;
    // cin >> test;
    for (int i = 1; i <= test; i++)
        solveTestCase(i);
}

Compilation message

lamp.cpp: In function 'long long int solveTestCase(long long int)':
lamp.cpp:85:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 4 ms 256 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Incorrect 4 ms 384 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #2
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 4 ms 256 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Incorrect 4 ms 384 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #3
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 4 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 10 ms 3100 KB Output is correct
8 Correct 28 ms 5648 KB Output is correct
9 Correct 28 ms 5648 KB Output is correct
10 Correct 28 ms 5636 KB Output is correct
11 Correct 27 ms 5580 KB Output is correct
12 Correct 10 ms 3100 KB Output is correct
13 Correct 10 ms 3100 KB Output is correct
14 Correct 10 ms 3100 KB Output is correct

Subtask #4
0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 4 ms 256 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Incorrect 4 ms 384 KB Output isn't correct
14 Halted 0 ms 0 KB -