#include "books.h"
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
vector<pair<int,int>> segs;
vector<int> vis;
pair<int,int> getNext(int x, bool r){
pair<int,int> bound = {x, x};
if(r) {
for(int i = x; i <= bound.second; ++i){
bound.first = min(bound.first,segs[vis[i]].first);
bound.second = max(bound.second,segs[vis[i]].second);
}
return bound;
} else {
for(int i = x; i >= bound.first; --i){
bound.first = min(bound.first,segs[vis[i]].first);
bound.second = max(bound.second,segs[vis[i]].second);
}
return bound;
}
}
ll minimum_walk(vector<int> p, int s) {
int n = p.size(), mx = 0, cn = 0;
ll ans = 0;
segs.resize(n+1,{n,0});
vis.resize(n,0);
for(int i = 0; i < n; ++i) {
if(!vis[i]) {
cn++;
while(!vis[i]) {
ans+=abs(i-p[i]);
vis[i] = cn;
i = p[i]; // goes back to original i
}
}
}
for(int i = 0; i < n; ++i) {
segs[vis[i]].first = min(segs[vis[i]].first,i);
segs[vis[i]].second = max(segs[vis[i]].second,i);
}
queue<int> Q;
Q.push(s);
int l = s, r = s;
while(Q.size()){
auto x = Q.front();
Q.pop();
for(int i = segs[vis[x]].first; i < l; ++i){
Q.push(i);
}
for(int i = segs[vis[x]].second; i > r; --i){
Q.push(i);
}
l = min(l,segs[vis[x]].first);
r = max(r,segs[vis[x]].second);
}
int cnt = 0;
int cu = 0;
while(l || r < n-1){
cnt++;
pair<int,int> a = {r,r}, b = {l,l};
if(r < n-1)a = getNext(r+1,1);
if(l)b = getNext(l-1,0);
if(a.first == a.second)cu++;
if(b.first == b.second)cu++;
if(a.first <= b.second){
ans+=2*cnt;
cnt = 0;
cu = 0;
}
pair<int,int> nbound = {min(a.first,b.first),max(a.second,b.second)};
for(int i = nbound.first; i < l; ++i){
Q.push(i);
}
for(int i = nbound.second; i > r; --i){
Q.push(i);
}
while(Q.size()){
auto x = Q.front();
Q.pop();
for(int i = segs[vis[x]].first; i < l; ++i){
Q.push(i);
}
for(int i = segs[vis[x]].second; i > r; --i){
Q.push(i);
}
l = min(l,segs[vis[x]].first);
r = max(r,segs[vis[x]].second);
}
}
ans+=4*cnt-2*cu;
return ans;
}
Compilation message
books.cpp: In function 'll minimum_walk(std::vector<int>, int)':
books.cpp:29:20: warning: unused variable 'mx' [-Wunused-variable]
29 | int n = p.size(), mx = 0, cn = 0;
| ^~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 ms |
212 KB |
Output is correct |
| 6 |
Correct |
0 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
1 ms |
212 KB |
Output is correct |
| 9 |
Correct |
1 ms |
300 KB |
Output is correct |
| 10 |
Correct |
1 ms |
212 KB |
Output is correct |
| 11 |
Correct |
1 ms |
212 KB |
Output is correct |
| 12 |
Correct |
1 ms |
212 KB |
Output is correct |
| 13 |
Correct |
1 ms |
300 KB |
Output is correct |
| 14 |
Correct |
0 ms |
212 KB |
Output is correct |
| 15 |
Correct |
1 ms |
256 KB |
Output is correct |
| 16 |
Correct |
1 ms |
300 KB |
Output is correct |
| 17 |
Correct |
1 ms |
296 KB |
Output is correct |
| 18 |
Correct |
1 ms |
212 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 ms |
212 KB |
Output is correct |
| 6 |
Correct |
0 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
1 ms |
212 KB |
Output is correct |
| 9 |
Correct |
1 ms |
300 KB |
Output is correct |
| 10 |
Correct |
1 ms |
212 KB |
Output is correct |
| 11 |
Correct |
1 ms |
212 KB |
Output is correct |
| 12 |
Correct |
1 ms |
212 KB |
Output is correct |
| 13 |
Correct |
1 ms |
300 KB |
Output is correct |
| 14 |
Correct |
0 ms |
212 KB |
Output is correct |
| 15 |
Correct |
1 ms |
256 KB |
Output is correct |
| 16 |
Correct |
1 ms |
300 KB |
Output is correct |
| 17 |
Correct |
1 ms |
296 KB |
Output is correct |
| 18 |
Correct |
1 ms |
212 KB |
Output is correct |
| 19 |
Correct |
1 ms |
212 KB |
Output is correct |
| 20 |
Correct |
1 ms |
212 KB |
Output is correct |
| 21 |
Correct |
1 ms |
300 KB |
Output is correct |
| 22 |
Incorrect |
1 ms |
212 KB |
3rd lines differ - on the 1st token, expected: '2082', found: '1128' |
| 23 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 ms |
212 KB |
Output is correct |
| 6 |
Correct |
0 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
1 ms |
212 KB |
Output is correct |
| 9 |
Correct |
1 ms |
300 KB |
Output is correct |
| 10 |
Correct |
1 ms |
212 KB |
Output is correct |
| 11 |
Correct |
1 ms |
212 KB |
Output is correct |
| 12 |
Correct |
1 ms |
212 KB |
Output is correct |
| 13 |
Correct |
1 ms |
300 KB |
Output is correct |
| 14 |
Correct |
0 ms |
212 KB |
Output is correct |
| 15 |
Correct |
1 ms |
256 KB |
Output is correct |
| 16 |
Correct |
1 ms |
300 KB |
Output is correct |
| 17 |
Correct |
1 ms |
296 KB |
Output is correct |
| 18 |
Correct |
1 ms |
212 KB |
Output is correct |
| 19 |
Correct |
1 ms |
212 KB |
Output is correct |
| 20 |
Correct |
1 ms |
212 KB |
Output is correct |
| 21 |
Correct |
1 ms |
300 KB |
Output is correct |
| 22 |
Incorrect |
1 ms |
212 KB |
3rd lines differ - on the 1st token, expected: '2082', found: '1128' |
| 23 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Incorrect |
1 ms |
212 KB |
3rd lines differ - on the 1st token, expected: '2094', found: '1194' |
| 5 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 ms |
212 KB |
Output is correct |
| 6 |
Correct |
0 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
1 ms |
212 KB |
Output is correct |
| 9 |
Correct |
1 ms |
300 KB |
Output is correct |
| 10 |
Correct |
1 ms |
212 KB |
Output is correct |
| 11 |
Correct |
1 ms |
212 KB |
Output is correct |
| 12 |
Correct |
1 ms |
212 KB |
Output is correct |
| 13 |
Correct |
1 ms |
300 KB |
Output is correct |
| 14 |
Correct |
0 ms |
212 KB |
Output is correct |
| 15 |
Correct |
1 ms |
256 KB |
Output is correct |
| 16 |
Correct |
1 ms |
300 KB |
Output is correct |
| 17 |
Correct |
1 ms |
296 KB |
Output is correct |
| 18 |
Correct |
1 ms |
212 KB |
Output is correct |
| 19 |
Correct |
1 ms |
212 KB |
Output is correct |
| 20 |
Correct |
1 ms |
212 KB |
Output is correct |
| 21 |
Correct |
1 ms |
300 KB |
Output is correct |
| 22 |
Incorrect |
1 ms |
212 KB |
3rd lines differ - on the 1st token, expected: '2082', found: '1128' |
| 23 |
Halted |
0 ms |
0 KB |
- |
