Submission #1076950

#	Time	Username	Problem	Language	Result	Execution time	Memory
1076950		bleahbleah	Tortoise (CEOI21_tortoise)	C++17	0 / 100	17 ms	25132 KiB

tortoise

#include <bits/stdc++.h>
using namespace std;
 
#define _ << " " <<
 
const int MAXN = 5e5 + 5;
const int off = 1 << 19;
const int inf = 1e9;
 
int a[MAXN];
int l[MAXN];
int r[MAXN];
int before[MAXN];
 
unordered_map<int, int> specialChair;
 
typedef pair<int, int> pii;
  
bool possible(multiset<int> s)
{
    int last = -1, timer = 0;
    for(auto x : s)
    {
        if(last == -1)
        {
            timer += x - 1;
        }
        else
        {
            if(l[last] != l[x] || r[last] != r[x])
                timer += x - last;
            else timer += min(last - l[last] + x - l[last], r[last] - last + r[last] - x);
        }
        if(timer > 2 * (x - 1))
        {
            return 0;
        }
        last = x;
        //cerr << timer << '\n';
    }
    //cerr << '\n';
    //for(auto x: s) cerr << x << ' '; cerr << '\n';
    //cerr << "ok\n";
    return 1;
}
struct Tournament {
    vector<int> t;
    vector<int> p;
 
    Tournament() {
        t.resize(2 * off);
        p.resize(2 * off);
    }
 
    void init() {
        for (int i = off; i < 2 * off; ++i) {
            t[i] = inf + (i - off);
        }
        for (int i = off - 1; i; i--) {
            t[i] = min(t[i * 2], t[i * 2 + 1]);
        }
    }
 
    void prop(int x) {
        if (p[x]) {
            t[x] += p[x];
            if (x < off) {
                p[x * 2] += p[x];
                p[x * 2 + 1] += p[x];
            }
            p[x] = 0;
        }
    }
 
    void upd(int a, int b, int v, int x = 1, int lo = 0, int hi = off) {
        if (lo >= a && hi <= b) {
            p[x] += v;
            prop(x);
            return;
        }
        prop(x);
        if (lo >= b || hi <= a) return;
        int mi = (lo + hi) >> 1;
        upd(a, b, v, x * 2, lo, mi);
        upd(a, b, v, x * 2 + 1, mi, hi);
        t[x] = min(t[x * 2], t[x * 2 + 1]);
    }
    int get(int a, int b, int x = 1, int lo = 0, int hi = off) {
        if (lo >= b || hi <= a) return inf;
        prop(x);
        if (lo >= a && hi <= b) {
            return t[x];
        }
 
        int mi = (lo + hi) >> 1;
        return min(get(a, b, x * 2, lo, mi),
                   get(a, b, x * 2 + 1, mi, hi));
    }
} special, updates, tracker;
 
void moveSpecial(int a, int b) {
    special.upd(a, a+1, +inf);
    special.upd(b, b+1, -inf);
}
void addSpecial(int a) {
    special.upd(a, a+1, -inf);
}
 
long long sum;
 
multiset<int> TT;
 
void solve(int x, int d, int type) {
    int cnt = 0;
    while(a[x] > 0) {
         TT.emplace(x);
         if(possible(TT)) {
           a[x] --;
           sum --;
           cnt ++;
         }
         else {
            TT.erase(TT.find(x));
            break;
         }
    }
}
 
int main() {
    int n; cin >> n;
 
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
        if (a[i] != -1) sum += a[i];
    }
 
    int tmp = -1;
    for (int i = 0; i < n; ++i) {
        if (a[i] == -1) {
            tmp = i;
        }
        l[i] = tmp;
    }
    tmp = -1;
    for (int i = n - 1; i >= 0; --i) {
        if (a[i] == -1) {
            tmp = i;
        }
        r[i] = tmp;
    }
 
    tmp = -1;
    for (int i = 0; i < n; ++i) {
        before[i] = tmp;
        if (a[i] > 0) {
            tmp = i;
        }
    }
 
    special.init();
    tracker.init();
    
    vector<pair<int, pii>> candidates;
    for (int i = 0; i < n; ++i) {
        if (a[i] > 0) {
            if (r[i] != -1) {
                candidates.push_back({r[i] - i, {i, 1}});
            }
            if (l[i] != -1) {
                candidates.push_back({i - l[i], {i, 0}});
            }
        }
    }
    sort(candidates.begin(), candidates.end());
 
    for (auto candidate : candidates) {
        int x = candidate.second.first;
        int d = candidate.first;
        int type = candidate.second.second;
 
        solve(x, d, type);
    }
 
   sum =0;
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
        if (a[i] != -1) sum += a[i];
    }
    cout << sum << '\n';
 
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 10
• Subtask 3: 0 / 30
• Subtask 4: 0 / 25
• Subtask 5: 0 / 27