Submission #1101325

#	Time	Username	Problem	Language	Result	Execution time	Memory
1101325		Sunbae	Rainforest Jumps (APIO21_jumps)	C++17	0 / 100	4 ms	4944 KiB

jumps

#include <bits/stdc++.h>
#define z exit(0)
using namespace std;
const int MXN = 2e5 + 5;
vector<int> g[MXN];
queue<int> q;
int stk[MXN], nxt[2][MXN], d[MXN], n, sz;
bool V(int i){ return 0 <= i && i < n;}
int ch[2] = {1, 1};
void init(int N, vector<int> H){
	n = N; 
	int st = sz = 0, ed = n, del = 1;
	for(int j = 0; j<2; ++j){
		int ff = 1;
		for(int i = st; i != ed; i += del){
			if(!ff) ch[j] &= (H[i-del] <= H[i]);
			while(sz && H[stk[sz-1]] <= H[i]) --sz;
			if(sz) nxt[j][i] = stk[sz-1];
			stk[sz++] = i;
			ff = 0;
		}
		st = n-1; ed = del = -1; sz = 0;
	}
    for(int j = 0; j<2; ++j){
        for(int i = 0; i<n; ++i){
            if(V(nxt[j][i])) g[i].push_back(nxt[j][i]);
        }
    }
}
int minimum_jumps(int A, int B, int C, int D){
	if(ch[0] || ch[1]) return C - D;
	while(!q.empty()) q.pop();
    fill(d, d+n, 1e8);
    for(int i = A; i<=B; ++i) d[i] = 0, q.emplace(i);
    while(!q.empty()){
        int u = q.front(); q.pop();
        for(int v: g[u]){
            if(d[v] > d[u] + 1) d[v] = d[u] + 1, q.emplace(v);
        }
    }
    int mn = *min_element(d+C, d+D+1);
    if(mn >= 1e8) mn = -1;
    return mn;
}

• Subtask 1: 0 / 4
• Subtask 2: 0 / 8
• Subtask 3: 0 / 13
• Subtask 4: 0 / 12
• Subtask 5: 0 / 23
• Subtask 6: 0 / 21
• Subtask 7: 0 / 19