Submission #71183

#TimeUsernameProblemLanguageResultExecution timeMemory
71183fallingstarBoxes with souvenirs (IOI15_boxes)C++14
10 / 100
2 ms376 KiB
#include "boxes.h" #include <algorithm> using namespace std; #define long long long const int N = 2e7 + 2; long fsuff[N], fpref[N]; long delivery(int n, int k, int L, int p[]) { int head = 0; while (head < n && p[head] == 0) ++head; long res = (long) (n - head + k - 1) / k * L; for (int i = n - 1; i >= head; --i) fsuff[i] = fsuff[i + k] + (L - p[i]) * 2; int r = head; while (r < n && fsuff[r] > fsuff[r + k] + L) r += k; for (int i = head; i < n; ++i) { fpref[i] = (i < k ? 0 : fpref[i - k]) + p[i] * 2; r = min(r + 1, n); while (r > i + 1 && fsuff[max(r - k, i + 1)] - L < fsuff[r]) r = max(r - k, i + 1); res = min(res, fpref[i] + fsuff[r] + (long) (r - i - 1 + k - 1) / k * L); } return res; }
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