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Submission #515119

# Submission time Handle Problem Language Result Execution time Memory
515119 2022-01-19T03:37:07 Z minhcool Rainforest Jumps (APIO21_jumps) C++17
4 / 100
 1130 ms 68508 KB 
#include<bits/stdc++.h>
using namespace std;
 
//#define int long long
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define foru(i, l, r) for(int i = l; i <= r; i++)
#define ford(i, r, l) for(int i = r; i >= l; i--)
 
typedef pair<int, int> ii;
typedef pair<ii, int> iii;
typedef pair<ii, ii> iiii;
 
const int N = 3e5 + 5;
 
const int oo = 1e9 + 7, mod = 1e9 + 7;
 
int n, h[N], lg2[N];
 
int nxtl[N], nxtr[N];
 
int small_jump[N][20], large_jump[N][20];
 
ii mx[N][20];
 
void init(int _n, vector<int> _H){
	n = _n;
	for(int i = 1; i <= n; i++) h[i] = _H[i - 1];
	h[0] = h[n + 1] = oo;
	stack<int> stk;
	stk.push(0);
	for(int i = 1; i <= n; i++) lg2[i] = log2(i);
	for(int i = 1; i <= n; i++){
		while(h[stk.top()] < h[i]) stk.pop();
		nxtl[i] = stk.top();
		stk.push(i);
	}
    //return;
	while(!stk.empty()) stk.pop();
	stk.push(n + 1);
	for(int i = n; i >= 1; i--){
		while(h[stk.top()] < h[i]) stk.pop();
		nxtr[i] = stk.top();
		stk.push(i);
	}
    //return;
	for(int i = 1; i <= n; i++){
		small_jump[i][0] = (h[nxtl[i]] < h[nxtr[i]] ? nxtl[i] : nxtr[i]);
		large_jump[i][0] = (h[nxtl[i]] > h[nxtr[i]] ? nxtl[i] : nxtr[i]);
	}
	for(int i = 1; i <= n; i++) mx[i][0] = {h[i], i};
	for(int i = 1; i <= 19; i++){
		for(int j = 1; (j + (1LL << i) - 1) <= n; j++) mx[j][i] = max(mx[j][i - 1], mx[j + (1LL << (i - 1))][i - 1]);
	}
	for(int i = 1; i <= 19; i++){
		for(int j = 1; j <= n; j++){
			small_jump[j][i] = small_jump[small_jump[j][i - 1]][i - 1];
			large_jump[j][i] = large_jump[large_jump[j][i - 1]][i - 1];
		}
	}
}
 
ii maxi(int l, int r){
	if(l > r) return {-oo, -oo};
	int k = lg2[r - l + 1];
	return max(mx[l][k], mx[r - (1LL << k) + 1][k]);
}
 
int cal(int a, int c){
	int answer = 0;
	for(int i = 19; i >= 0; i--){
		if(h[large_jump[a][i]] <= h[c]){
			answer += (1LL << i);
			a = large_jump[a][i];
		}
	}
	for(int i = 19; i >= 0; i--){
		if(h[small_jump[a][i]] <= h[c]){
			answer += (1LL << i);
			a = small_jump[a][i];
		}
	}
	if(a != c) return -1;
	else return answer;
}
 
int cal2(int a, int b, int c){
	//assert(c == d);
	if(h[b] > h[c]){
		return -1;
	}
	int l = a, r = b;
	while(l < r){
		int mid = (l + r) >> 1;
		if(maxi(mid, b).fi > h[c]) l = mid + 1;
		else r = mid;
	}
	int pos = maxi(l, b).se;
	return cal(pos, c);
}
 
int minimum_jumps(int a, int b, int c, int d){
    //return -1;
	a++, b++, c++, d++;
	if(b == (c - 1)){
		if(h[b] > maxi(c, d).fi) return -1;
		else return 1;
	}
	ii temp1 = maxi(a, b), temp2 = maxi(b + 1, c - 1), temp3 = maxi(c, d);
	if(min(temp1.fi, temp3.fi) > temp2.fi){
        //assert(0);
		int l = a, r = b;
		while(l < r){
			int mid = (l + r + 1) >> 1;
			if(maxi(mid, b).fi < h[temp2.fi]) r = mid - 1;
			else l = mid;
		}
		if(temp3.fi > h[l]) return 1;
		else a = l + 1;
	}
	if(temp3.fi < temp2.fi) return -1;
	int answer = oo;
	answer = min(answer, cal2(a, b, temp2.se) + 1);
	if(a && maxi(1, a - 1).fi > temp2.fi){
		int l = 1, r = a - 1;
		while(l < r){
			int mid = (l + r + 1) >> 1;
			if(maxi(mid, a - 1).fi < h[temp2.fi]) r = mid - 1;
			else l = mid;
		}
		if(h[l] < temp3.fi) answer = min(answer, cal2(a, b, l) + 1);
	}
    if(c == d){
		assert(answer == cal2(a, b, c));
    }
	return (answer == oo ? -1 : answer);
}
 
/*
void process(){
 
}
 
signed main(){
	ios_base::sync_with_stdio(0);
	process();
}*/

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 328 KB Output is correct
2 Correct 0 ms 328 KB Output is correct
3 Correct 177 ms 54672 KB Output is correct
4 Correct 1130 ms 68376 KB Output is correct
5 Correct 889 ms 34496 KB Output is correct
6 Correct 1128 ms 68380 KB Output is correct
7 Correct 929 ms 46784 KB Output is correct
8 Correct 941 ms 68464 KB Output is correct

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 328 KB Output is correct
2 Correct 0 ms 328 KB Output is correct
3 Correct 0 ms 328 KB Output is correct
4 Correct 0 ms 328 KB Output is correct
5 Runtime error 3 ms 456 KB Execution killed with signal 6
6 Halted 0 ms 0 KB -

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 328 KB Output is correct
2 Correct 0 ms 328 KB Output is correct
3 Correct 0 ms 328 KB Output is correct
4 Correct 0 ms 328 KB Output is correct
5 Runtime error 3 ms 456 KB Execution killed with signal 6
6 Halted 0 ms 0 KB -

Subtask #4
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 328 KB Output is correct
2 Correct 0 ms 328 KB Output is correct
3 Correct 1 ms 328 KB Output is correct
4 Correct 0 ms 328 KB Output is correct
5 Correct 124 ms 54540 KB Output is correct
6 Correct 139 ms 67648 KB Output is correct
7 Correct 72 ms 34788 KB Output is correct
8 Correct 142 ms 67644 KB Output is correct
9 Correct 16 ms 10364 KB Output is correct
10 Correct 133 ms 67612 KB Output is correct
11 Correct 118 ms 68508 KB Output is correct
12 Correct 141 ms 68144 KB Output is correct
13 Correct 134 ms 68228 KB Output is correct
14 Correct 139 ms 67644 KB Output is correct
15 Incorrect 136 ms 67960 KB Output isn't correct
16 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 328 KB Output is correct
2 Correct 0 ms 328 KB Output is correct
3 Correct 0 ms 328 KB Output is correct
4 Runtime error 93 ms 62128 KB Execution killed with signal 6
5 Halted 0 ms 0 KB -

Subtask #6
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 328 KB Output is correct
2 Correct 0 ms 328 KB Output is correct
3 Correct 0 ms 328 KB Output is correct
4 Runtime error 93 ms 62128 KB Execution killed with signal 6
5 Halted 0 ms 0 KB -

Subtask #7
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 328 KB Output is correct
2 Correct 0 ms 328 KB Output is correct
3 Correct 177 ms 54672 KB Output is correct
4 Correct 1130 ms 68376 KB Output is correct
5 Correct 889 ms 34496 KB Output is correct
6 Correct 1128 ms 68380 KB Output is correct
7 Correct 929 ms 46784 KB Output is correct
8 Correct 941 ms 68464 KB Output is correct
9 Correct 0 ms 328 KB Output is correct
10 Correct 0 ms 328 KB Output is correct
11 Correct 0 ms 328 KB Output is correct
12 Correct 0 ms 328 KB Output is correct
13 Runtime error 3 ms 456 KB Execution killed with signal 6
14 Halted 0 ms 0 KB -