제출 #127479

#제출 시각아이디문제언어결과실행 시간메모리
127479wasyl선물상자 (IOI15_boxes)C++11
100 / 100
600 ms208708 KiB
#include "boxes.h" long long max(long long a, long long b) { return (a > b)? a : b; } long long min(long long a, long long b) { return (a < b)? a : b; } long long delivery(int n, int k, int l, int p[]) { static constexpr int nax = 1e7; static constexpr long long inf = 1e18; long long dp[nax + 2], pd[nax + 2]; dp[0] = 0; for (int i = 1; i <= n; ++i) dp[i] = dp[max(0, i - k)] + p[i - 1] * 2ll; pd[n + 1] = 0; for (int i = n; i >= 1; --i) pd[i] = pd[min(n + 1, i + k)] + (l - p[i - 1]) * 2ll; long long res = inf; for (int i = 0; i <= n; ++i) res = min(res, dp[i] + pd[i + 1]); for (int i = 0; i < n; ++i) { int a = i - 1; int b = i + k; if (a < -1 or b > n) continue; res = min(res, l + dp[a + 1] + pd[b + 1]); } return res; }
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