oj.uz

Submission #338161

# Submission time Handle Problem Language Result Execution time Memory
338161 2020-12-22T15:21:32 Z pit4h Ancient Books (IOI17_books) C++14
12 / 100
 33 ms 32376 KB 
#include "books.h"
#include "bits/stdc++.h"
#define st first
#define nd second
#define mp make_pair
using namespace std;
using ll = long long;
using pii = pair<int, int>;
const int N = 1e6+1;
struct DSU {
	int f[N], cnt[N], l[N], r[N];
	DSU() {
		for(int i=0; i<N; ++i) {
			f[i] = l[i] = r[i] = i;
			cnt[i] = 1;
		}
	}
	int Find(int x) {
		if(f[x]==x) return x;
		f[x] = Find(f[x]);
		return f[x];
	}
	void Union(int x, int y) {
		x = Find(x), y = Find(y);
		if(x==y) return;
		if(cnt[x] < cnt[y]) swap(x, y);
		cnt[x] += cnt[y];
		l[x] = min(l[x], l[y]);
		r[x] = max(r[x], r[y]);
		f[y] = x;
	}
	int getl(int x) { return l[Find(x)]; }
	int getr(int x) { return r[Find(x)]; }
};
DSU dsu;
int segments[2][N];

bool overlap(int l1, int r1, int l2, int r2) {
	return (l1<l2 && r1>r2) || (l1>r2 && r1<l2);
}

ll minimum_walk(vector<int> p, int s) {
	int n = p.size();
	ll ans = 0;
	for(int i=0; i<n; ++i) {
		ans += abs(p[i] - i);
		dsu.Union(i, p[i]);
	}
	
	vector<int> vec;
	for(int i=n-1; i>=0; --i) {
		while(vec.size() && dsu.getr(i) >= vec.back()) {
			if(dsu.getl(vec.back()) < i) {
				dsu.Union(i, vec.back());
			}
			vec.pop_back();
		}
		vec.push_back(i);
	}
	
	for(int i=0; i<n; ++i) {
		segments[0][i] = segments[1][i] = i;
	}
	
	for(int i=0; i<n; ++i) {
		if(dsu.Find(i)==i && dsu.getl(i)!=dsu.getr(i)) {
			segments[0][dsu.getl(i)] = dsu.getr(i);
			segments[1][dsu.getr(i)] = dsu.getl(i);
		}
	}

	int le=0, ri=n-1;
	while(le<s && dsu.getl(le)==dsu.getr(le)) {
		le++;
	}
	while(ri>s && dsu.getl(ri)==dsu.getr(ri)) {
		ri--;
	}

	ll ANS = ans;
	vector<int> st;
	for(int i=0; i<n; ++i) {
		if(dsu.getl(i)==dsu.getr(i));
		else {
			if(dsu.getl(i)==i) st.push_back(dsu.Find(i));
			if(dsu.getr(i)==i) {
				assert(st.back()==dsu.Find(i));
				st.pop_back();
			}
		}
		if(i>=le && i<ri) {
			if(st.empty()) {
				ANS+=2;
			}
		}
	}

	int pos[2] = {dsu.getl(s), dsu.getr(s)}, move[2] = {-1, 1};

	int iter=0;
	while(pos[0]>le || pos[1]<ri) {
		iter++;
		int cost[2] = {0, 0}, lim[2] = {pos[0], pos[1]};	
		pos[0]--; pos[1]++;
		for(int dir=0; dir<2; ++dir) {
			while(pos[dir]>=le && pos[dir]<=ri && !overlap(pos[dir], segments[dir][pos[dir]], lim[0], lim[1]) ) {
				cost[dir] -= abs(pos[dir] - segments[dir][pos[dir]]);
				pos[dir] += move[dir];
			}
		}
		pos[0] = max(pos[0], le), pos[1] = min(pos[1], ri);
		cost[0] += lim[0] - pos[0];
		cost[1] += pos[1] - lim[1];
		if(segments[0][pos[0]] == pos[1]) {
			ans += min(cost[0], cost[1]) * 2;
		}
		else {
			ans += (cost[0] + cost[1]) * 2;
		}
	}
	assert(s!=0 || iter<=1);
	assert(s!=0 || ans==ANS);
	return ans;
}

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 15980 KB Output is correct
2 Correct 10 ms 15980 KB Output is correct
3 Correct 10 ms 15980 KB Output is correct
4 Correct 10 ms 15980 KB Output is correct
5 Correct 10 ms 15980 KB Output is correct
6 Correct 10 ms 15980 KB Output is correct
7 Correct 12 ms 15980 KB Output is correct
8 Correct 10 ms 15980 KB Output is correct
9 Correct 10 ms 15980 KB Output is correct
10 Correct 10 ms 15980 KB Output is correct
11 Correct 10 ms 15980 KB Output is correct
12 Correct 10 ms 15980 KB Output is correct
13 Correct 10 ms 15980 KB Output is correct
14 Correct 10 ms 15980 KB Output is correct
15 Correct 10 ms 15980 KB Output is correct
16 Correct 10 ms 15980 KB Output is correct
17 Correct 12 ms 15980 KB Output is correct
18 Correct 10 ms 15980 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 15980 KB Output is correct
2 Correct 10 ms 15980 KB Output is correct
3 Correct 10 ms 15980 KB Output is correct
4 Correct 10 ms 15980 KB Output is correct
5 Correct 10 ms 15980 KB Output is correct
6 Correct 10 ms 15980 KB Output is correct
7 Correct 12 ms 15980 KB Output is correct
8 Correct 10 ms 15980 KB Output is correct
9 Correct 10 ms 15980 KB Output is correct
10 Correct 10 ms 15980 KB Output is correct
11 Correct 10 ms 15980 KB Output is correct
12 Correct 10 ms 15980 KB Output is correct
13 Correct 10 ms 15980 KB Output is correct
14 Correct 10 ms 15980 KB Output is correct
15 Correct 10 ms 15980 KB Output is correct
16 Correct 10 ms 15980 KB Output is correct
17 Correct 12 ms 15980 KB Output is correct
18 Correct 10 ms 15980 KB Output is correct
19 Correct 10 ms 15988 KB Output is correct
20 Correct 10 ms 15980 KB Output is correct
21 Correct 10 ms 15980 KB Output is correct
22 Runtime error 33 ms 32376 KB Execution killed with signal 6 (could be triggered by violating memory limits)
23 Halted 0 ms 0 KB -

Subtask #3
0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 15980 KB Output is correct
2 Correct 10 ms 15980 KB Output is correct
3 Correct 10 ms 15980 KB Output is correct
4 Correct 10 ms 15980 KB Output is correct
5 Correct 10 ms 15980 KB Output is correct
6 Correct 10 ms 15980 KB Output is correct
7 Correct 12 ms 15980 KB Output is correct
8 Correct 10 ms 15980 KB Output is correct
9 Correct 10 ms 15980 KB Output is correct
10 Correct 10 ms 15980 KB Output is correct
11 Correct 10 ms 15980 KB Output is correct
12 Correct 10 ms 15980 KB Output is correct
13 Correct 10 ms 15980 KB Output is correct
14 Correct 10 ms 15980 KB Output is correct
15 Correct 10 ms 15980 KB Output is correct
16 Correct 10 ms 15980 KB Output is correct
17 Correct 12 ms 15980 KB Output is correct
18 Correct 10 ms 15980 KB Output is correct
19 Correct 10 ms 15988 KB Output is correct
20 Correct 10 ms 15980 KB Output is correct
21 Correct 10 ms 15980 KB Output is correct
22 Runtime error 33 ms 32376 KB Execution killed with signal 6 (could be triggered by violating memory limits)
23 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 10 ms 15980 KB 3rd lines differ - on the 1st token, expected: '3304', found: '3298'
2 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 15980 KB Output is correct
2 Correct 10 ms 15980 KB Output is correct
3 Correct 10 ms 15980 KB Output is correct
4 Correct 10 ms 15980 KB Output is correct
5 Correct 10 ms 15980 KB Output is correct
6 Correct 10 ms 15980 KB Output is correct
7 Correct 12 ms 15980 KB Output is correct
8 Correct 10 ms 15980 KB Output is correct
9 Correct 10 ms 15980 KB Output is correct
10 Correct 10 ms 15980 KB Output is correct
11 Correct 10 ms 15980 KB Output is correct
12 Correct 10 ms 15980 KB Output is correct
13 Correct 10 ms 15980 KB Output is correct
14 Correct 10 ms 15980 KB Output is correct
15 Correct 10 ms 15980 KB Output is correct
16 Correct 10 ms 15980 KB Output is correct
17 Correct 12 ms 15980 KB Output is correct
18 Correct 10 ms 15980 KB Output is correct
19 Correct 10 ms 15988 KB Output is correct
20 Correct 10 ms 15980 KB Output is correct
21 Correct 10 ms 15980 KB Output is correct
22 Runtime error 33 ms 32376 KB Execution killed with signal 6 (could be triggered by violating memory limits)
23 Halted 0 ms 0 KB -