제출 #425569

#제출 시각아이디문제언어결과실행 시간메모리
425569haxorman선물상자 (IOI15_boxes)C++14
20 / 100
1 ms204 KiB
#include "boxes.h" #include "bits/stdc++.h" using namespace std; int n, k, l; long long delivery(int N, int K, int L, int p[]) { n = N, k = K, l = L; long long ans = 0; if (k == 1) { for (int i = 0; i < n; ++i) { ans += min(p[i], (l - 1) - p[i] + 1) * 2; } } else if (k == n) { long long half_1 = -1, half_2 = -1; for (int i = 0; i < n; ++i) { if (i) { assert(p[i] >= p[i - 1]); } if (p[i] <= l / 2) { half_1 = p[i]; } else if (half_2 == -1) { half_2 = p[i]; } } if (half_1 != -1) { ans += 2 * half_1; } if (half_2 != -1) { ans += 2 * ((l - 1) - half_2 + 1); } ans = min(ans, (long long) l); } else { int cnt_1 = 0, cnt_2 = 0; for (int i = 0; i < n; ++i) { if (p[i] <= l / 2) { ++cnt_1; } else { ++cnt_2; } } int pos = 0, cur = k; for (int i = 0; i < n && p[i] <= l / 2; ++i) { ans += p[i] - pos; pos = p[i]; --cur; --cnt_1; if ((!cur && cnt_1) || (cnt_1 <= k && cnt_1 > cur)) { ans += 2 * pos; cur = k; } } ans += pos; pos = 0, cur = k; for (int i = n - 1; i >= 0 && p[i] > l / 2; --i) { if (!pos) { ans += ((l - 1) - p[i] + 1); pos = p[i]; } else { ans += abs(p[i] - pos); } --cur; --cnt_2; if ((!cur && cnt_2) || (cnt_2 <= k && cnt_2 > cur)) { ans += 2 * ((l - 1) - pos + 1); cur = k; } } ans += ((l - 1) - pos + 1); } return ans; }
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