Submission #330026

#	Time	Username	Problem	Language	Result	Execution time	Memory
330026		dolphingarlic	Circus (Balkan15_CIRCUS)	C++14	100 / 100	794 ms	21352 KiB

circus

#include "circus.h"

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

int n, m;
vector<int> p, mn;
deque<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;

    mn = vector<int>(n, INT_MAX);
    for (int i = n - 1; ~i; i--) {
        int dist = m - p[i];
        auto lb = lower_bound(to_left.begin(), to_left.end(), make_pair(p[i], 0));
        if (lb != to_left.end()) dist = min(dist, lb->second - p[i]);
        mn[i] = min(mn[i], dist);
        while (to_left.size() && p[i] - mn[i] >= to_left[0].first)
            to_left.pop_front();
        to_left.push_front({p[i] - mn[i], p[i]});
    }
    to_left.clear();
    // for (int i = 0; i < n; i++) cout << mn[i] << ' ';
    // cout << '\n';
    for (int i = 0; i < n; i++) {
        int dist = m - p[i];
        auto ub = upper_bound(to_right.begin(), to_right.end(), make_pair(p[i], INT_MAX));
        if (ub != to_right.begin()) dist = min(dist, p[i] - prev(ub)->second);
        mn[i] = min(mn[i], dist);
        while (to_right.size() && p[i] + mn[i] <= to_right.back().first)
            to_right.pop_back();
        to_right.push_back({p[i] + mn[i], p[i]});
    }
    to_right.clear();
    // for (int i = 0; i < n; i++) cout << mn[i] << ' ';
    // cout << '\n';
    for (int i = n - 1; ~i; i--) {
        int dist = m - p[i];
        auto lb = lower_bound(to_left.begin(), to_left.end(), make_pair(p[i], 0));
        if (lb != to_left.end()) dist = min(dist, lb->second - p[i]);
        mn[i] = min(mn[i], dist);
        while (to_left.size() && p[i] - mn[i] >= to_left[0].first)
            to_left.pop_front();
        to_left.push_front({p[i] - mn[i], p[i]});
    }
    to_left.clear();
    // for (int i = 0; i < n; i++) cout << mn[i] << ' ';
    // cout << '\n';

    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 - 1; ~i; i--)
        if (!to_right.size() || p[i] + mn[i] < to_right[0].first)
            to_right.push_front({p[i] + mn[i], p[i]});
}

int minLength(int D) {
    int ans = m - D;
    auto lb = lower_bound(to_left.begin(), to_left.end(), make_pair(D, 0));
    if (lb != to_left.end()) ans = min(ans, lb->second - D);
    auto ub = upper_bound(to_right.begin(), to_right.end(), make_pair(D, INT_MAX));
    if (ub != to_right.begin()) ans = min(ans, D - prev(ub)->second);
    return ans;
}

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