Submission #329954

#	Time	Username	Problem	Language	Result	Execution time	Memory
329954		dolphingarlic	Circus (Balkan15_CIRCUS)	C++14	0 / 100	1099 ms	524292 KiB

circus

#include "circus.h"

#include <bits/stdc++.h>
using namespace std;

struct State {
    int cost, idx, change_cnt;
    bool dir; // Left = 0
};

bool operator<(State A, State B) { return A.cost > B.cost; }

int n, m;
vector<int> p, mn;
vector<pair<int, int>> to_left, to_right;

void init(int N, int M, int P[]) {
    for (int i = 0; i < N; i++) p.push_back(P[i]);
    sort(p.begin(), p.end());
    p.erase(unique(p.begin(), p.end()), p.end());
    n = p.size(), m = M;
    p.push_back(m);

    mn = vector<int>(n + 1, INT_MAX);
    priority_queue<State> pq;
    pq.push({mn[n] = 0, n, 0, false});
    while (pq.size()) {
        State curr = pq.top();
        pq.pop();
        if (curr.cost != mn[curr.idx]) continue;
        for (int i = 0; i < n; i++) {
            if (curr.change_cnt == 2 && i > curr.idx) break;
            if (abs(p[curr.idx] - p[i]) >= curr.cost && abs(p[curr.idx] - p[i]) < mn[i]) {
                bool dir = p[i] > p[curr.idx];
                pq.push({mn[i] = abs(p[curr.idx] - p[i]), i, curr.change_cnt + (curr.dir ^ dir), dir});
            }
        }
    }

    for (int i = 0; i <= n; i++)
        if (!to_left.size() || p[i] - mn[i] > to_left.back().first)
            to_left.push_back({p[i] - mn[i], p[i]});
    for (int i = n; ~i; i--)
        if (!to_right.size() || p[i] + mn[i] < to_right.back().first)
            to_right.push_back({p[i] + mn[i], p[i]});
    reverse(to_right.begin(), to_right.end());
}

int minLength(int D) {
    return min(
        lower_bound(to_left.begin(), to_left.end(), make_pair(D, 0))->second - D,
        D - prev(upper_bound(to_right.begin(), to_right.end(), make_pair(D, INT_MAX)))->second
    );
}

Compilation message (stderr)

grader.cpp: In function 'int main()':
grader.cpp:14:12: warning: unused variable 'max_code' [-Wunused-variable]
   14 |  long long max_code;
      |            ^~~~~~~~
grader.cpp:16:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 |  scanf("%d%d", &N, &M);
      |  ~~~~~^~~~~~~~~~~~~~~~
grader.cpp:18:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   18 |   scanf("%d", &P[i]);
      |   ~~~~~^~~~~~~~~~~~~
grader.cpp:21:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   21 |  scanf("%d", &Q);
      |  ~~~~~^~~~~~~~~~
grader.cpp:23:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   23 |   scanf("%d", &d);
      |   ~~~~~^~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 17
• Subtask 3: 0 / 23
• Subtask 4: 0 / 9
• Subtask 5: 0 / 31
• Subtask 6: 0 / 9