oj.uz

Submission #1100604

# Submission time Handle Problem Language Result Execution time Memory
1100604 2024-10-14T10:20:05 Z crafticat Sprinklers (CEOI24_sprinklers) C++17
6 / 100
 885 ms 12864 KB 
#include <bits/stdc++.h>

using ll = long long;
using namespace std;
template<typename T>

using V = vector<T>;
using vi = V<ll>;
using vb = V<bool>;
using pi = pair<ll,ll>;


vi water, flowers;
V<bool> types;
set<ll> problems;
constexpr ll inf = 1e9 * 2 + 7;

bool between(ll l, ll r) {
    auto it = problems.upper_bound(l);
    if (it == problems.end() || *it >= r) return true;
    return false;
}

ll pos(V<V<ll>> &dp, ll i, ll lastR, ll r) {
    ll leftR = -1;
    if (i >= 0) {
        for (ll j = 0; j < 3; ++j) {
            if (j == 0) leftR = water[i];
            if (j == 1 && i - 1 >= 0) leftR = water[i - 1] + r;
            if (j == 2) leftR = water[i] + r;
            if (dp[i][j] == -1) continue;
            if (between(leftR, lastR)) return j;
        }
    } else {
       return between(0, lastR) ? 0 : -1;
    }
    return -1;
}

bool ok(ll r) {
    V<V<ll>> dp(water.size() + 1, vi(3,-1));

    for (ll i = 0; i < water.size(); ++i) {
        for (ll j = 0; j < 3; ++j) {
            ll lastR = -1;
            if (j == 0) lastR = water[i] - r;
            if (j == 1 && between(water[i - 1] + r, water[i] - r)) lastR = water[i] - r;
            if (j == 2) lastR = water[i];
            dp[i][j] = pos(dp,i - 1 + (j == 1 ? -1 : 0),lastR, r);
        }
    }

    // Backtrace
    ll last = dp[water.size() - 1][2];
    ll i = water.size() - 1;
    if (last == -1) return false;
    while (last != -1) {
        if (last == 1) {
            types.push_back(false);
            if (i - 2 < 0) return true;
            types.push_back(true);
            last = dp[i - 2][last];
            i -= 2;
        } else {
            types.push_back(last == 2);
            if (i - 1 < 0) return true;
            last = dp[i - 1][last];
            i--;
        }
    }
    return true;
}

int main() {

    ios_base::sync_with_stdio(false); cin.tie(nullptr);

    ll n, m; cin >> n >> m;
    water.resize(n + 1);
    flowers.resize(m);

    for (ll i = 0; i < n; ++i) {
        cin >> water[i];
        water[i]++;
    }
    water[n] = inf;
    for (ll i = 0; i < m; ++i) {
        cin >> flowers[i];
        flowers[i]++;
        problems.insert(flowers[i]);
    }

    ll l = 0, r = inf; // Last true
    while (r > l) {
        ll mid = l + (r - l) / 2;
        if (ok(mid)) {
            r = mid;
        } else
            l = mid + 1;
    }

    types.clear();
    ok(l);
    if (l == inf) {
        cout << -1;
        return 0;
    }
    cout << l << "\n";
    types.pop_back();
    std::reverse(types.begin(), types.end());
    for (auto x : types) {
        cout << (x ? "R" : "L");
    }
    if (types.size() == 0) exit(5);

    return 0;
}

Compilation message

Main.cpp: In function 'bool ok(ll)':
Main.cpp:43:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int, std::allocator<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     for (ll i = 0; i < water.size(); ++i) {
      |                    ~~^~~~~~~~~~~~~~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Correct
2 Correct 1 ms 336 KB Correct

Subtask #1
0.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Correct
2 Runtime error 23 ms 3920 KB Execution failed because the return code was nonzero
3 Halted 0 ms 0 KB -

Subtask #2
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Correct
2 Correct 32 ms 4152 KB Correct
3 Correct 41 ms 1372 KB Correct
4 Correct 695 ms 12864 KB Correct
5 Correct 687 ms 12832 KB Correct
6 Correct 1 ms 336 KB Correct
7 Correct 1 ms 336 KB Correct
8 Correct 494 ms 9508 KB Correct
9 Correct 512 ms 9516 KB Correct
10 Correct 749 ms 11552 KB Correct
11 Correct 206 ms 7452 KB Correct
12 Correct 267 ms 7948 KB Correct
13 Correct 686 ms 10784 KB Correct
14 Correct 708 ms 11036 KB Correct
15 Correct 637 ms 11112 KB Correct
16 Correct 632 ms 10024 KB Correct

Subtask #3
0.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Correct
2 Correct 1 ms 336 KB Correct
3 Correct 1 ms 336 KB Correct
4 Correct 1 ms 336 KB Correct
5 Correct 1 ms 336 KB Correct
6 Incorrect 1 ms 336 KB User solution is incorrect
7 Halted 0 ms 0 KB -

Subtask #4
0.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Correct
2 Correct 138 ms 4708 KB Correct
3 Incorrect 885 ms 12336 KB Incorrect string length
4 Halted 0 ms 0 KB -

Subtask #5
0.0 / 47.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Correct
2 Correct 1 ms 336 KB Correct
3 Runtime error 23 ms 3920 KB Execution failed because the return code was nonzero
4 Halted 0 ms 0 KB -