Submission #1069935

#	Time	Username	Problem	Language	Result	Execution time	Memory
1069935		Alebn	Sprinklers (CEOI24_sprinklers)	C++14	20 / 100	2066 ms	5068 KiB

Main

#include <bits/stdc++.h>
#define int long long

using namespace std;

struct Obj {
    int t, pos, i;
    Obj(){}
    Obj(int ti, int pi, int ii):t(ti),pos(pi),i(ii){}
};
bitset<20> bs;
bool trywith(vector<Obj>& a, int& n, int K) {
    bool ok;
    for(int i = 0; i < (1 << n); i++) {
        ok = true;
        bitset<20> bit(i);
        vector<bool> oki(a.size(), false);
        for(int j = 0; j < a.size(); j++) {
            if(!a[j].t) {
                oki[j] = true;
                for(int k = 0; k < a.size(); k++) {
                    if(bit[a[j].i] && a[j].pos <= a[k].pos && a[k].pos <= a[j].pos + K || !bit[a[j].i] && a[j].pos - K <= a[k].pos && a[k].pos <= a[j].pos) oki[k] = true;
                }
            }
        }
        for(int j = 0; j < a.size(); j++) {
            if(!oki[j]) ok = false;
        }
        if(ok) {
            bs = bit;
            break;
        }
    }
    return ok;
}

void solve() {
    int n, m, temp;
    cin >> n >> m;
    vector<Obj> a;
    for(int i = 0; i < n; i++) {
        cin >> temp;
        a.push_back(Obj(0, temp, i));
    }
    for(int i = 0; i < m; i++) {
        cin >> temp;
        a.push_back(Obj(1, temp, i));
    }
    sort(a.begin(), a.end(), [](Obj x, Obj y){
        if(x.pos == y.pos) return x.t > y.t;
        return x.pos < y.pos;
    });
    int l = 0, r = 1e9+1, mid, ans = -1;
    while(l <= r) {
        mid = (l + r) / 2;
        if(trywith(a, n, mid)) {
            r = mid - 1;
            ans = mid;
        } else l = mid + 1;
    }
    cout << ans << "\n";
    if(ans != -1) {
        for(int i = 0; i < n; i++) {
            if(bs[i]) cout << 'R';
            else cout << 'L';
        }
        cout << "\n";
    }
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    solve();
}

Compilation message (stderr)

Main.cpp: In function 'bool trywith(std::vector<Obj>&, long long int&, long long int)':
Main.cpp:18:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<Obj>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |         for(int j = 0; j < a.size(); j++) {
      |                        ~~^~~~~~~~~~
Main.cpp:21:34: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<Obj>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |                 for(int k = 0; k < a.size(); k++) {
      |                                ~~^~~~~~~~~~
Main.cpp:22:60: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   22 |                     if(bit[a[j].i] && a[j].pos <= a[k].pos && a[k].pos <= a[j].pos + K || !bit[a[j].i] && a[j].pos - K <= a[k].pos && a[k].pos <= a[j].pos) oki[k] = true;
      |                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:26:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<Obj>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |         for(int j = 0; j < a.size(); j++) {
      |                        ~~^~~~~~~~~~

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