제출 #1086938

#제출 시각아이디문제언어결과실행 시간메모리
1086938codexistent선물상자 (IOI15_boxes)C++14
10 / 100
1 ms2396 KiB
// Key to solution lies in the fact that you cannot have more than 1 full-circle trip. // PROOF: Assume you have 2 full-circle trips. Then you travel 2L time and deliver >= 2K souvenirs. // But we can easily just deliver the first k souvenirs(from clockwise direction) in 2 * x time going // clockwise and deliver the first k souvenirs(from counter-clockwise direction) in at most 2 * (l - x) // time going counter-clockwise, which is just as good if not better. □ #include "boxes.h" #include <bits/stdc++.h> using namespace std; #define ll long long #define MAXN 10000005 #define FOR(i, a, b) for(ll i = a; i <= b; i++) #define RFOR(i, a, b) for(ll i = a; i >= b; i--) ll dp_cw[MAXN], dp_ccw[MAXN], r = __LONG_LONG_MAX__; long long delivery(int N, int K, int L, int p[]) { dp_cw[0] = dp_ccw[N + 1] = 0; FOR(i, 1, N) dp_cw[i] = dp_cw[max(0ll, i - K)] + 2 * p[i - 1]; RFOR(i, N, 1) dp_ccw[i] = dp_ccw[min((ll)N + 1, i + K)] + 2 * (L - p[i - 1]); FOR(i, 0, N) r = min(r, dp_cw[i] + dp_ccw[i + 1]); if(N >= K) FOR(i, 0, N) r = min(r, dp_cw[i] + dp_ccw[i + K + 1] + 2 * L); return r; }
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