제출 #972509

#제출 시각아이디문제언어결과실행 시간메모리
972509sleepntsheep밀림 점프 (APIO21_jumps)C++17
4 / 100
552 ms18380 KiB
#include "jumps.h" #include <vector> int subtask = -1; #define MAX_N 200000 #define MAX_M (2*MAX_N) int tin[MAX_N], tout[MAX_N], head[MAX_N], nxt[MAX_M], vv[MAX_M], indeg[MAX_N], rt, timer, dd[MAX_N]; void link(int u, int v) { static int i = 1; nxt[i] = head[u]; vv[i] = v; ++indeg[v]; head[u] = i++; } void dfs(int u) { tin[u] = timer++; for (int j = head[u]; j; j = nxt[j]) dd[vv[j]] = dd[u] + 1, dfs(vv[j]); tout[u] = timer - 1; } void init(int N, std::vector<int> H) { if (N <= 200) subtask = 2; else if (N <= 2000) subtask = 3; int flag = 1; for (int i = 1; i < N; ++i) if (H[i] != H[i-1] + 1) flag = 0; if(flag) subtask = 1; static int stk[MAX_N], so; so = 0; for (int i = 0; i < N; stk[so++] = i++) while (so && H[stk[so-1]] < H[i]) link(stk[--so], i); so = 0; for (int i = N - 1; i >= 0; stk[so++] = i--) while (so && H[stk[so-1]] < H[i]) link(stk[--so], i); for (int i = 0; i < N; ++i) if (indeg[i] == 0) rt = i; dfs(rt); } int minimum_jumps(int A, int B, int C, int D) { if (subtask == 1) { if (A > D) return -1; if (B >= C) return 0; return C - B; } int z = 1e9; for (int i = A; i <= B; ++i) for (int j = C; j <= D; ++j) if (tin[i] <= tin[j] && tout[j] <= tout[i] && dd[i] - dd[j] < z) z = dd[i] - dd[j]; if (z == 1e9) return -1; return z; }
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