/*
ID: varunra2
LANG: C++
TASK: books
*/
#include <bits/stdc++.h>
using namespace std;
#ifdef DEBUG
#include "lib/debug.h"
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#define debug_arr(...) \
cerr << "[" << #__VA_ARGS__ << "]:", debug_arr(__VA_ARGS__)
#pragma GCC diagnostic ignored "-Wsign-compare"
//#pragma GCC diagnostic ignored "-Wunused-parameter"
//#pragma GCC diagnostic ignored "-Wunused-variable"
#else
#define debug(...) 42
#endif
#define EPS 1e-9
#define IN(A, B, C) assert(B <= A && A <= C)
#define INF (int)1e9
#define MEM(a, b) memset(a, (b), sizeof(a))
#define MOD 1000000007
#define MP make_pair
#define PB push_back
#define all(cont) cont.begin(), cont.end()
#define rall(cont) cont.end(), cont.begin()
#define x first
#define y second
const double PI = acos(-1.0);
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef map<int, int> MPII;
typedef multiset<int> MSETI;
typedef set<int> SETI;
typedef set<string> SETS;
typedef vector<int> VI;
typedef vector<PII> VII;
typedef vector<VI> VVI;
typedef vector<string> VS;
#define rep(i, a, b) for (int i = a; i < (b); ++i)
#define trav(a, x) for (auto& a : x)
#define sz(x) (int)(x).size()
typedef pair<int, int> pii;
typedef vector<int> vi;
#pragma GCC diagnostic ignored "-Wsign-compare"
// util functions
int s;
int n;
int targl, targr;
int cycs = 0;
VI wcyc;
VI lcyc;
VI rcyc;
ll retgood = 0;
ll retbad = 0;
void init(VI& order) {
n = sz(order);
targl = s;
targr = s;
wcyc.assign(n, -1);
lcyc.resize(n);
rcyc.resize(n);
}
void extend(int& l, int &r) {
// can we move l or r?
int nl, nr;
nl = min(lcyc[wcyc[l]], lcyc[wcyc[r]]);
nr = max(rcyc[wcyc[l]], rcyc[wcyc[r]]);
while(nl < l or nr > r) {
if(l >= nl) {
l--;
nl = min(nl, lcyc[wcyc[l]]);
nr = max(nr, rcyc[wcyc[r]]);
}
else {
r++;
nl = min(nl, lcyc[wcyc[r]]);
nr = max(nr, rcyc[wcyc[r]]);
}
}
}
ll solve() {
int l = s, r = s;
do {
extend(l, r);
int costl = 0, costr = 0, ll = l, lr = r, rl = l, rr = r;
bool next = false;
while(true) {
if(ll <= targl) break;
ll--;
extend(ll, lr);
costl += 2
if(lr > r) {
next = true;
break;
}
}
while(true) {
if(rr >= targr or rl < l) break;
rr++;
extend(rl, rr);
costl += 2;
}
if(next)
retbad += min(costl, costr);
else retbad += (costl + costr);
l = min(ll, rl);
r = max(rr, lr);
} while(l > targl or r < targr);
}
ll minimum_walk(VI order, int s) {
::s = s;
init(order);
for (int i = 0; i < n; i++) {
retgood += abs(i - order[i]);
if (wcyc[i] != -1) continue;
int pos = i;
lcyc[cycs] = i;
rcyc[cycs] = i;
do {
wcyc[pos] = cycs;
rcyc[cycs] = max(rcyc[cycs], pos);
pos = order[pos];
} while (pos != i);
if(i != order[i]) {
targl = min(targl, lcyc[c]);
targr = max(targr, rcyc[c]);
}
c++;
}
return retgood + solve();
}
// int main() {
// #ifndef ONLINE_JUDGE
// freopen("books.in", "r", stdin);
// freopen("books.out", "w", stdout);
// #endif
// cin.sync_with_stdio(0);
// cin.tie(0);
// return 0;
// }
Compilation message
books.cpp: In function 'll solve()':
books.cpp:107:17: error: expected ';' before 'if'
107 | costl += 2
| ^
| ;
108 | if(lr > r) {
| ~~
books.cpp:129:1: warning: no return statement in function returning non-void [-Wreturn-type]
129 | }
| ^
books.cpp: In function 'll minimum_walk(VI, int)':
books.cpp:146:31: error: 'c' was not declared in this scope
146 | targl = min(targl, lcyc[c]);
| ^
books.cpp:149:5: error: 'c' was not declared in this scope
149 | c++;
| ^
