Language: C++

#include <bits/stdc++.h>
#include <omp.h>

using namespace std;

typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;


//#define int ll
#define rand shittttty_shit
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rng_64(chrono::steady_clock::now().time_since_epoch().count());


typedef pair<int, int> pii;
typedef pair<string, string> pst;
typedef pair<pii, pii> piii;
typedef vector<piii> vpii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector< vi > vvi;
typedef vector< vvi > vvvi;
typedef vector<pii> vpi;
typedef vector<short> vs;
typedef vector<vs> vvs;
typedef vector<vvs> vvvs;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<vvl> vvvl;
typedef vector<ld> vld;
typedef vector<vld> vvld;
typedef vector<vvld> vvvld;
typedef vector<string> vst;
typedef vector<vst> vvst;
typedef pair<ld, ld> pld;
typedef pair<pld, pld> pldd;
typedef vector<pld> vpd;
typedef complex<double> base;


#define inmin(a, b) a = min(a, (b))
#define inmax(a, b) a = max(a, (b))
#define my_abs(a) (((a) >= 0) ? (a) : -(a))
#define mp(a, b) make_pair(a, (b))
#define ALL(a) a.begin(),a.end()
#define RALL(a) a.rbegin(),a.rend()
#define sqr(x) ((x) * (x))
#define fori(i, n) for(int i = 0; i < int(n); ++i)
#define SZ(a) ((int)((a).size()))
#define MODIK(a) (a >= M ? a - M : a)
#define triple(T) tuple<T, T, T>
#define quad(T) tuple<T, T, T, T>
#define watch(x) cout << (#x) << " = " << x << endl;
#ifdef ART_HOME
#define cerr cout
#else
#define cerr if (false) cerr
#endif


const double PI = 2 * acos(0.0);

const string DIGITS = "0123456789";
const string ALPH = "abcdefghijklmnopqrstuvwxyz";

istream &operator >> (istream &in, pii &a)
{
    in >> a.first >> a.second;
    return in;
}


ostream &operator << (ostream &out, pii &a)
{
    out << a.first << ' ' << a.second;
    return out;
}


istream &operator >> (istream &in, pld &a)
{
    in >> a.first >> a.second;
    return in;
}


ostream &operator << (ostream &out, pld &a)
{
    out << a.first << ' ' << a.second;
    return out;
}


template <class T0, class T1>
inline ostream & operator << (ostream &out, pair<T0, T1> &a) {
    return out << "{" << a.first << ", " << a.second << "}";
}

template <class T0, class T1, class T2>
inline ostream & operator << (ostream &out, tuple<T0, T1, T2> &a) {
    return out << "{" << get<0>(a) << ", " << get<1>(a) << ", " << get<2>(a) << "}";
}

template <class T0, class T1, class T2, class T3>
inline ostream & operator << (ostream &out, tuple<T0, T1, T2, T3> &a) {
    return out << "{" << get<0>(a) << ", " << get<1>(a) <<
               ", " << get<2>(a) << ", " <<  get<3>(a) << "}";
}

template<class T>
inline ostream & operator << (ostream &out, vector<T> &a) {
    out << "[";
    fori (i, a.size())
        out << a[i] << vector<string>{", ", "]  "}[i + 1 == a.size()];
    return out;
}


void print(int a, int b, int n, vi h)
{
    ofstream cout("output.txt");
    cout << SZ(h) << ' ' << a << ' ' << b << '\n';
    for (int i = 0; i < SZ(h); ++i) {
        cout << h[i]  << ' ';
    }
    cout.close();
    exit(0);
}


inline bool break_time(ld time)
{
    return clock() > CLOCKS_PER_SEC * time;
}


ld get_rand_ld(ld l, ld r)
{
    uniform_real_distribution<double> gen(l, r);
    return gen(rng);
}


bool may(int E, ld T)
{
    if (E < 0)
        return 1;

    double eps = get_rand_ld(0, 1);
    return eps < exp(-E / T);
}


void smain();

signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

#ifdef ART_HOME
    freopen("input.txt", "r", stdin);
    clock_t start = clock();
#endif
    cout << setprecision(10) << fixed;
    smain();
#ifdef ART_HOME
    cout << "\nTOTAL EXECUTION TIME: " << float( clock () - start ) /  CLOCKS_PER_SEC << endl;
#endif
}


const int N = 2e5 + 100, B = 50, oo = 1e9 + 100, M = 998244353;
const int M1 = 1000000093, x1 = 27162;
const int M2 = 1000000087, x2 = 241;
const ld pi = atan2(1, 0) * 2, EPS = 1e-9;


int n;


int left_right(int add, const vi &pos, const vi &cnt)
{
    if (SZ(pos) == 0)
        return 0;

    int ans = 0;
    for (auto ind : pos) {

        int l = 0, r = n - 1;
        while (r - l > 1) {
            int m = l + r >> 1;


            int lb = n + ind - m;
            int rb = n + ind + add;

            if (lb > rb)
                swap(lb, rb);

            assert(lb > 0 && rb < SZ(cnt));
            if (cnt[rb] - cnt[lb - 1] >= 0)
                r = m;
            else
                l = m;
        }

        ans = max(ans, r);
    }

    if (add < 0)
        return max(2 * (ans - add), 0);
    else
        return 2 * ans;
}


int right_left(int add, const vi &pos, const vi &cnt)
{
    if (SZ(pos) == 0)
        return 0;

    int ans = 0;
    for (auto ind : pos) {

        int l = 0, r = n - 1;
        while (r - l > 1) {
            int m = l + r >> 1;


            int lb = n + ind + m;
            int rb = n + ind + add;

            if (lb > rb)
                swap(lb, rb);

            assert(lb > 0 && rb < SZ(cnt));
            if (cnt[rb] - cnt[lb - 1] >= 0)
                r = m;
            else
                l = m;
        }

        ans = max(ans, r);
    }

    if (add < 0)
        return 2 * ans;
    else
        return max(2 * (ans - add), 0);


    return ans;
}


int solution(string a, string b)
{
    if (a == b)
        return 0;

    if (count(ALL(b), '1') == 0)
        return -1;

    b = b + b + b;
    n = SZ(a);

    vi cnt(3 * n);
    cnt[0] = b[0] - '0';
    for (int i = 1; i < 3 * n; ++i)
        cnt[i] += cnt[i - 1] + b[i - 1] - '0';

    int pl = n, pr = 2 * n - 1;
    int ans = oo;

    for (int add = -(n - 1); add < n; ++add) {
        int pll = pl + add, prr = pr + add;
        int val = abs(add);
        vi pos;#include <bits/stdc++.h>
#include <omp.h>

using namespace std;

typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;


//#define int ll
#define rand shittttty_shit
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rng_64(chrono::steady_clock::now().time_since_epoch().count());


typedef pair<int, int> pii;
typedef pair<string, string> pst;
typedef pair<pii, pii> piii;
typedef vector<piii> vpii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector< vi > vvi;
typedef vector< vvi > vvvi;
typedef vector<pii> vpi;
typedef vector<short> vs;
typedef vector<vs> vvs;
typedef vector<vvs> vvvs;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<vvl> vvvl;
typedef vector<ld> vld;
typedef vector<vld> vvld;
typedef vector<vvld> vvvld;
typedef vector<string> vst;
typedef vector<vst> vvst;
typedef pair<ld, ld> pld;
typedef pair<pld, pld> pldd;
typedef vector<pld> vpd;
typedef complex<double> base;


#define inmin(a, b) a = min(a, (b))
#define inmax(a, b) a = max(a, (b))
#define my_abs(a) (((a) >= 0) ? (a) : -(a))
#define mp(a, b) make_pair(a, (b))
#define ALL(a) a.begin(),a.end()
#define RALL(a) a.rbegin(),a.rend()
#define sqr(x) ((x) * (x))
#define fori(i, n) for(int i = 0; i < int(n); ++i)
#define SZ(a) ((int)((a).size()))
#define MODIK(a) (a >= M ? a - M : a)
#define triple(T) tuple<T, T, T>
#define quad(T) tuple<T, T, T, T>
#define watch(x) cout << (#x) << " = " << x << endl;
#ifdef ART_HOME
#define cerr cout
#else
#define cerr if (false) cerr
#endif


const double PI = 2 * acos(0.0);

const string DIGITS = "0123456789";
const string ALPH = "abcdefghijklmnopqrstuvwxyz";

istream &operator >> (istream &in, pii &a)
{
    in >> a.first >> a.second;
    return in;
}


ostream &operator << (ostream &out, pii &a)
{
    out << a.first << ' ' << a.second;
    return out;
}


istream &operator >> (istream &in, pld &a)
{
    in >> a.first >> a.second;
    return in;
}


ostream &operator << (ostream &out, pld &a)
{
    out << a.first << ' ' << a.second;
    return out;
}


template <class T0, class T1>
inline ostream & operator << (ostream &out, pair<T0, T1> &a) {
    return out << "{" << a.first << ", " << a.second << "}";
}

template <class T0, class T1, class T2>
inline ostream & operator << (ostream &out, tuple<T0, T1, T2> &a) {
    return out << "{" << get<0>(a) << ", " << get<1>(a) << ", " << get<2>(a) << "}";
}

template <class T0, class T1, class T2, class T3>
inline ostream & operator << (ostream &out, tuple<T0, T1, T2, T3> &a) {
    return out << "{" << get<0>(a) << ", " << get<1>(a) <<
               ", " << get<2>(a) << ", " <<  get<3>(a) << "}";
}

template<class T>
inline ostream & operator << (ostream &out, vector<T> &a) {
    out << "[";
    fori (i, a.size())
        out << a[i] << vector<string>{", ", "]  "}[i + 1 == a.size()];
    return out;
}


void print(int a, int b, int n, vi h)
{
    ofstream cout("output.txt");
    cout << SZ(h) << ' ' << a << ' ' << b << '\n';
    for (int i = 0; i < SZ(h); ++i) {
        cout << h[i]  << ' ';
    }
    cout.close();
    exit(0);
}


inline bool break_time(ld time)
{
    return clock() > CLOCKS_PER_SEC * time;
}


ld get_rand_ld(ld l, ld r)
{
    uniform_real_distribution<double> gen(l, r);
    return gen(rng);
}


bool may(int E, ld T)
{
    if (E < 0)
        return 1;

    double eps = get_rand_ld(0, 1);
    return eps < exp(-E / T);
}


void smain();

signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

#ifdef ART_HOME
    freopen("input.txt", "r", stdin);
    clock_t start = clock();
#endif
    cout << setprecision(10) << fixed;
    smain();
#ifdef ART_HOME
    cout << "\nTOTAL EXECUTION TIME: " << float( clock () - start ) /  CLOCKS_PER_SEC << endl;
#endif
}


const int N = 2e5 + 100, B = 50, oo = 1e9 + 100, M = 998244353;
const int M1 = 1000000093, x1 = 27162;
const int M2 = 1000000087, x2 = 241;
const ld pi = atan2(1, 0) * 2, EPS = 1e-9;


int n;


int left_right(int add, const vi &pos, const vi &cnt)
{
    if (SZ(pos) == 0)
        return 0;

    int ans = 0;
    for (auto ind : pos) {

        int l = 0, r = n - 1;
        while (r - l > 1) {
            int m = l + r >> 1;


            int lb = n + ind - m;
            int rb = n + ind + add;

            if (lb > rb)
                swap(lb, rb);

            if (add < 0)
                lb = n + ind;
            
            assert(lb > 0 && rb < SZ(cnt));
            if (cnt[rb] - cnt[lb - 1] >= 0)
                r = m;
            else
                l = m;
        }

        ans = max(ans, r);
    }

    if (add < 0)
        return max(2 * (ans - add), 0);
    else
        return 2 * ans;
}


int right_left(int add, const vi &pos, const vi &cnt)
{
    if (SZ(pos) == 0)
        return 0;

    int ans = 0;
    for (auto ind : pos) {

        int l = 0, r = n - 1;
        while (r - l > 1) {
            int m = l + r >> 1;


            int lb = n + ind + m;
            int rb = n + ind + add;

            if (lb > rb)
                swap(lb, rb);
            
            if (add > 0)
                lb = n + ind;

            assert(lb > 0 && rb < SZ(cnt));
            if (cnt[rb] - cnt[lb - 1] >= 0)
                r = m;
            else
                l = m;
        }

        ans = max(ans, r);
    }

    if (add < 0)
        return 2 * ans;
    else
        return max(2 * (ans - add), 0);


    return ans;
}


int solution(string a, string b)
{
    if (a == b)
        return 0;

    if (count(ALL(b), '1') == 0)
        return -1;

    b = b + b + b;
    n = SZ(a);

    vi cnt(3 * n);
    cnt[0] = b[0] - '0';
    for (int i = 1; i < 3 * n; ++i)
        cnt[i] += cnt[i - 1] + b[i - 1] - '0';

    int pl = n, pr = 2 * n - 1;
    int ans = oo;

    for (int add = -(n - 1); add < n; ++add) {
        int pll = pl + add, prr = pr + add;
        int val = abs(add);
        vi pos;

        for (int i = pll; i <= prr; ++i)
            if (a[i - pll] != b[i])
            {
                val++;

                if (a[i - pll] == '1')
                    pos.push_back(i - pll);
            }


        ans = min(ans, val + left_right(add, pos, cnt));
        ans = min(ans, val + right_left(add, pos, cnt));
    }

    return ans;
}


void smain()
{
    string a, b;
    cin >> a >> b;
    cout << solution(a, b);
}


        for (int i = pll; i <= prr; ++i)
            if (a[i - pll] != b[i])
            {
                val++;

                if (a[i - pll] == '1')
                    pos.push_back(i - pll);
            }


        ans = min(ans, val + left_right(add, pos, cnt));
        ans = min(ans, val + right_left(add, pos, cnt));
    }

    return ans;
}


void smain()
{
    string a, b;
    cin >> a >> b;
    cout << solution(a, b);
}


Compiler output:
a.cc:280:16: error: stray '#' in program
  280 |         vi pos;#include <bits/stdc++.h>
      |                ^
a.cc: In function 'int solution(std::string, std::string)':
a.cc:280:17: error: 'include' was not declared in this scope
  280 |         vi pos;#include <bits/stdc++.h>
      |                 ^~~~~~~
a.cc:280:26: error: 'bits' was not declared in this scope
  280 |         vi pos;#include <bits/stdc++.h>
      |                          ^~~~
a.cc:280:31: error: 'stdc' was not declared in this scope; did you mean 'std'?
  280 |         vi pos;#include <bits/stdc++.h>
      |                               ^~~~
      |                               std
a.cc:283:1: error: expected primary-expression before 'using'
  283 | using namespace std;
      | ^~~~~
a.cc:300:22: error: 'typedef struct std::pair<long long int, long long int> pll' redeclared as different kind of entity
  300 | typedef pair<ll, ll> pll;
      |                      ^~~
a.cc:278:13: note: previous declaration 'int pll'
  278 |         int pll = pl + add, prr = pr + add;
      |             ^~~
a.cc:348:1: error: a function-definition is not allowed here before '{' token
  348 | {
      | ^
a.cc:355:1: error: a function-definition is not allowed here before '{' token
  355 | {
      | ^
a.cc:362:1: error: a function-definition is not allowed here before '{' token
  362 | {
      | ^
a.cc:369:1: error: a function-definition is not allowed here before '{' token
  369 | {
      | ^
a.cc:375:1: error: a template declaration cannot appear at block scope
  375 | template <class T0, class T1>
      | ^~~~~~~~
a.cc:385:1: error: a template declaration cannot appear at block scope
  385 | template <class T0, class T1, class T2, class T3>
      | ^~~~~~~~
a.cc:401:1: error: a function-definition is not allowed here before '{' token
  401 | {
      | ^
a.cc:413:1: error: a function-definition is not allowed here before '{' token
  413 | {
      | ^
a.cc:419:1: error: a function-definition is not allowed here before '{' token
  419 | {
      | ^
a.cc:426:1: error: a function-definition is not allowed here before '{' token
  426 | {
      | ^
a.cc:437:12: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
  437 | signed main() {
      |            ^~
a.cc:437:12: note: remove parentheses to default-initialize a variable
  437 | signed main() {
      |            ^~
      |            --
a.cc:437:12: note: or replace parentheses with braces to value-initialize a variable
a.cc:437:15: error: a function-definition is not allowed here before '{' token
  437 | signed main() {
      |               ^
a.cc:463:1: error: a function-definition is not allowed here before '{' token
  463 | {
      | ^
a.cc:502:1: error: a function-definition is not allowed here before '{' token
  502 | {
      | ^
a.cc:544:1: error: a function-definition is not allowed here before '{' token
  544 | {
      | ^
a.cc:586:1: error: a function-definition is not allowed here before '{' token
  586 | {
      | ^