oj.uz

Submission #385164

# Submission time Handle Problem Language Result Execution time Memory
385164 2021-04-03T12:25:07 Z ACmachine Sparklers (JOI17_sparklers) C++17
0 / 100
 1915 ms 492 KB 
#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T, typename U> using ordered_map = tree<T, U, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

typedef long long ll;
typedef long double ld;

typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

typedef vector<int> vi;
typedef vector<ll> vll;

#define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
#define FORD(i,j,k,in) for(int i=(j); i >=(k);i-=in)
#define REP(i,b) FOR(i,0,b,1)
#define REPD(i,b) FORD(i,b,0,1)
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define all(x) begin(x), end(x)
#define MANY_TESTS int tcase; cin >> tcase; while(tcase--)

const double EPS = 1e-9;
const int MOD = 1e9+7;
const ll INFF = 1e18;
const int INF = 1e9;
const ld PI = acos((ld)-1);
const vi dy = {1, 0, -1, 0, -1, 1, 1, -1};
const vi dx = {0, 1, 0, -1, -1, 1, -1, 1};

void DBG(){cout << "]" << endl;}
template<typename T, typename ...U> void DBG(const T& head, const U... args){ cout << head << "; "; DBG(args...); }
#define dbg(...) cout << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__);
#define chk() cout << "Check at line(" << __LINE__ << ") hit." << endl;

template<class T, unsigned int U>
ostream& operator<<(ostream& out, const array<T, U> &v){out << "[";  REP(i, U) out << v[i] << ", ";  out << "]"; return out;}
template <class T, class U>
ostream& operator<<(ostream& out, const pair<T, U> &par) {out << "[" << par.first << ";" << par.second << "]"; return out;}
template <class T>
ostream& operator<<(ostream& out, const set<T> &cont) { out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template <class T, class U>
ostream& operator<<(ostream& out, const map<T, U> &cont) {out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template<class T>
ostream& operator<<(ostream& out, const vector<T> &v){ out << "[";  REP(i, v.size()) out << v[i] << ", ";  out << "]"; return out;}

template<class T>
istream& operator>>(istream& in, vector<T> &v){ for(auto &x : v) in >> x; return in; }

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);
    int n, k; ll t;
    cin >> n >> k >> t;
    k--;
    vector<ll> x(n);
    cin >> x;
    REP(i, n) x[i] *= 2;
    auto check = [&](ll s, int mask) -> bool{
        int left = k - 1;
        int right = k + 1;
        ll curr_pos = x[k];
        ll curr_t = t * s;
        vector<ll> nx = x;
        REP(i, n - 1){
            if(mask&(1 << i)){
                if(left == -1)
                    return false;
                ll diff = abs(curr_pos - nx[left]) / 2;
                left--;
                if(diff > curr_t)
                    return false;
                curr_t -= diff;
                curr_t += t * s;
                curr_pos -= diff;
                REP(j, n){
                    if(nx[j] < curr_pos){
                        if(abs(nx[j] - curr_pos) > diff){
                            nx[j] += diff;
                        }
                        else{
                            nx[j] = curr_pos;
                        }
                    }
                    else{
                        if(abs(nx[j] - curr_pos) > diff){
                            nx[j] -= diff;
                        }
                        else{
                            nx[j] = curr_pos;
                        }
                    }
                }
            }
            else{
                if(right == n)
                    return false;
                ll diff = abs(curr_pos - nx[right]) / 2;
                right++;
                if(diff > curr_t)
                    return false;
                curr_t -= diff;
                curr_t += t * s;
                curr_pos += diff;
                REP(j, n){
                    if(nx[j] < curr_pos){
                        if(abs(nx[j] - curr_pos) > diff){
                            nx[j] += diff;
                        }
                        else{
                            nx[j] = curr_pos;
                        }
                    }
                    else{
                        if(abs(nx[j] - curr_pos) > diff){
                            nx[j] -= diff;
                        }
                        else{
                            nx[j] = curr_pos;
                        }
                    }
                }
            }
        }
        return true;
    };
    ll ans = INF;
    ll l = 1;
    ll r = (ll)2e9 / t + 100;
    while(l <= r){
        ll mid = (l + r) >> 1;
        bool can = false;
        REP(mask, (1 << (n - 1))){
            if(check(mid, mask)){
                can = true;
                break;
            }
        }
        if(can){
            ans = mid;
            r = mid - 1;
        }
        else{
            l = mid + 1;
        }
    }
    cout << ans / 2 + ans%2 <<"\n";
    return 0;
}

Subtask #1
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 550 ms 364 KB Output is correct
5 Correct 1702 ms 364 KB Output is correct
6 Correct 991 ms 388 KB Output is correct
7 Correct 505 ms 492 KB Output is correct
8 Correct 147 ms 364 KB Output is correct
9 Correct 442 ms 492 KB Output is correct
10 Correct 463 ms 492 KB Output is correct
11 Correct 127 ms 492 KB Output is correct
12 Correct 274 ms 492 KB Output is correct
13 Correct 903 ms 492 KB Output is correct
14 Correct 1182 ms 364 KB Output is correct
15 Correct 1915 ms 392 KB Output is correct
16 Correct 261 ms 492 KB Output is correct
17 Correct 132 ms 364 KB Output is correct
18 Correct 168 ms 492 KB Output is correct
19 Incorrect 1 ms 364 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 550 ms 364 KB Output is correct
5 Correct 1702 ms 364 KB Output is correct
6 Correct 991 ms 388 KB Output is correct
7 Correct 505 ms 492 KB Output is correct
8 Correct 147 ms 364 KB Output is correct
9 Correct 442 ms 492 KB Output is correct
10 Correct 463 ms 492 KB Output is correct
11 Correct 127 ms 492 KB Output is correct
12 Correct 274 ms 492 KB Output is correct
13 Correct 903 ms 492 KB Output is correct
14 Correct 1182 ms 364 KB Output is correct
15 Correct 1915 ms 392 KB Output is correct
16 Correct 261 ms 492 KB Output is correct
17 Correct 132 ms 364 KB Output is correct
18 Correct 168 ms 492 KB Output is correct
19 Incorrect 1 ms 364 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 550 ms 364 KB Output is correct
5 Correct 1702 ms 364 KB Output is correct
6 Correct 991 ms 388 KB Output is correct
7 Correct 505 ms 492 KB Output is correct
8 Correct 147 ms 364 KB Output is correct
9 Correct 442 ms 492 KB Output is correct
10 Correct 463 ms 492 KB Output is correct
11 Correct 127 ms 492 KB Output is correct
12 Correct 274 ms 492 KB Output is correct
13 Correct 903 ms 492 KB Output is correct
14 Correct 1182 ms 364 KB Output is correct
15 Correct 1915 ms 392 KB Output is correct
16 Correct 261 ms 492 KB Output is correct
17 Correct 132 ms 364 KB Output is correct
18 Correct 168 ms 492 KB Output is correct
19 Incorrect 1 ms 364 KB Output isn't correct
20 Halted 0 ms 0 KB -