Submission #1046166

#	Time	Username	Problem	Language	Result	Execution time	Memory
1046166		c2zi6	Sprinklers (CEOI24_sprinklers)	C++14	26 / 100	2059 ms	2212 KiB

Main

#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define replr(i, a, b) for (int i = int(a); i <= int(b); ++i)
#define reprl(i, a, b) for (int i = int(a); i >= int(b); --i)
#define rep(i, n) for (int i = 0; i < int(n); ++i)
#define mkp(a, b) make_pair(a, b)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef vector<int> VI;
typedef vector<PII> VPI;
typedef vector<VI> VVI;
typedef vector<VVI> VVVI;
typedef vector<VPI> VVPI;
typedef pair<ll, ll> PLL;
typedef vector<ll> VL;
typedef vector<PLL> VPL;
typedef vector<VL> VVL;
typedef vector<VVL> VVVL;
typedef vector<VPL> VVPL;
template<class T> T setmax(T& a, T b) {if (a < b) return a = b; return a;}
template<class T> T setmin(T& a, T b) {if (a < b) return a; return a = b;}
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template<class T>
using indset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef vector<char> VC;
typedef vector<VC> VVC;
typedef vector<bool> VB;
typedef vector<VB> VVB;
 
bool checkcover(VI& a, VPI& ranges) {
    /* khamarem or erkusn el sortavorac en*/
    int i = 0;
    for (auto[L, R] : ranges) {
        if (a[i] < L) return false;
        while (i < a.size() && a[i] <= R) i++;
        if (i == a.size()) break;
    }
    return i == a.size();
}

void solve() {
    int n, m;
    cin >> n >> m;
    VI a(n);
    VI b(m);
    for (int& x : a) cin >> x;
    for (int& x : b) cin >> x;

    bool test2 = true;
    for (int i = 0; i < a.size(); i += 3) {
        if (i+2 >= a.size() || a[i] != a[i+1] || a[i] != a[i+2]) {
            test2 = false;
            break;
        }
    }
    
    function<bool(ll)> can;
    string ans(n, 'R');
    if (test2) {
        for (int i = 0; i < a.size(); i += 3) ans[i] = 'L';
        can = [&](ll d) {
            VPI ranges;
            for (int i = 0; i < a.size(); i += 3) {
                ranges.pb({a[i]-d, a[i]+d});
            }
            return checkcover(b, ranges);
        };
    } else {
        can = [&](ll d) {
            rep(s, 1<<n) {
                VPI ranges;
                rep(i, n) {
                    if (s & (1<<i)) {
                        ans[i] = 'L';
                        ranges.pb({a[i]-d, a[i]});
                    } else {
                        ans[i] = 'R';
                        ranges.pb({a[i], a[i]+d});
                    }
                }
                sort(all(ranges));
                if (checkcover(b, ranges)) return true;
            }
            return false;
        };
    }


    ll l = -1, r = 2e9;
    while (l + 1 < r) {
        ll m = (l + r) / 2;
        if (can(m)) r = m;
        else l = m;
    }
    if (r == 2e9) cout << -1 << endl;
    else {
        can(r);
        cout << r << endl;
        cout << ans << endl;
    }
}
 
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL), cout.tie(NULL);
	/*freopen("mincross.in", "r", stdin); */
	/*freopen("test.out", "w", stdout); */
	int t = 1;
	/*cin >> t; */
	while (t--) solve();
}

Compilation message (stderr)

Main.cpp: In function 'bool checkcover(VI&, VPI&)':
Main.cpp:40:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   40 |     for (auto[L, R] : ranges) {
      |              ^
Main.cpp:42:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |         while (i < a.size() && a[i] <= R) i++;
      |                ~~^~~~~~~~~~
Main.cpp:43:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |         if (i == a.size()) break;
      |             ~~^~~~~~~~~~~
Main.cpp:45:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |     return i == a.size();
      |            ~~^~~~~~~~~~~
Main.cpp: In function 'void solve()':
Main.cpp:57:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |     for (int i = 0; i < a.size(); i += 3) {
      |                     ~~^~~~~~~~~~
Main.cpp:58:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |         if (i+2 >= a.size() || a[i] != a[i+1] || a[i] != a[i+2]) {
      |             ~~~~^~~~~~~~~~~
Main.cpp:67:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |         for (int i = 0; i < a.size(); i += 3) ans[i] = 'L';
      |                         ~~^~~~~~~~~~
Main.cpp: In lambda function:
Main.cpp:70:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |             for (int i = 0; i < a.size(); i += 3) {
      |                             ~~^~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 3 / 3
• Subtask 2: 6 / 6
• Subtask 3: 17 / 17
• Subtask 4: 0 / 27
• Subtask 5: 0 / 47