Submission #1292013

#	Time	Username	Problem	Language	Result	Execution time	Memory
1292013		M_SH_O	Flip it and Stick it (CCO23_day2problem1)	C++20	8 / 25	4 ms	724 KiB

Main

/*#pragma GCC optimize("O3")
#pragma GCC optimization("Ofast,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")*/
#include <bits/stdc++.h>
/*#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>*/

#define ll long long
#define ll1 long long
#define ull unsigned long long
#define dou long double
#define str string
#define vll vector<ll>
#define vi vector<int>
#define pll pair<ll, ll>
#define vpll vector<pair<ll, ll>>
#define vbool vector<bool>
#define vstr vector<str>
#define vvll vector<vll>
#define pb push_back
#define pf push_front
#define endl "\n"
#define fr first
#define se second
// #define sortcmp(a) sort(a.begin(), a.end(), cmp)
#define sort(a) sort(a.begin(), a.end())
#define reverse(a) reverse(a.begin(), a.end())
#define speed ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define ordered_set tree<ll, null_type, less_equal<ll>, rb_tree_tag, tree_order_statistics_node_update>

using namespace std;
//using namespace __gnu_pbds;

const ll INF = 1e18+7;
const int lg = 20;
//const ll MOD = 1e9+7;
//const ll MOD2 = 998244353;
const ll MOD3 = 1e6+3;

mt19937 rng(1488);
ll randll(ll l, ll r) {
    return uniform_int_distribution<ll>(l, r)(rng);
}

int main() {
    speed;

    str s, s1;
    cin >> s;
    cin >> s1;
    if (s1.size() == 1) {
        sort(s);
        if (str(1, s[0]) == s1 || str(1, s[s.size()-1]) == s1) cout << -1 << endl;
        else cout << 0 << endl;
    }
    else if (s1.size() == 2 && s1[0] != s1[1]){
        if (s1[0] == '0') reverse(s);
        ll k = 0;
        for (int i = 0; i < s.size(); i ++) {
            if (s[i] == '0') continue;
            if (i == 0 || s[i-1] == '0') k ++;
        }
        if (s[s.size()-1] == '1') k --;
        cout << k << endl;
    }
    else if (s1.size() == 2) {
        if (s1[0] == '1') {
            s1[0] = s1[1] = '0';
            for (int i = 0; i < s.size(); i++) {
                if (s[i] == '0') s[i] = '1';
                else s[i] = '0';
            }
        }

        ll k = 0, k1 = 0, c = 0, c1 = 0;
        for (int i = 0; i < s.size(); i ++) {
            if (s[i] == '1') {
                k1 ++;
                c += max((ll)0, k-1);
                k = 0;
            }
            else {
                k ++;
                if (i-k1 != 0) k1 --;
                if (k1 >= 0)c1 += k1;
                k1 = 0;
            }
        }
        c += max((ll)0, k-1);
        c1 += k1;
        //cout << c1 << ' ' << c << endl;
        if (c1 < c) cout << -1 << endl;
        else cout << c << endl;
    }
    else if (s1[0] != s1[2]) {
        if (s1[0] == '1') {
            for (int i = 0; i < s.size(); i++) {
                if (s[i] == '0') s[i] = '1';
                else s[i] = '0';
            }
            for (int i = 0; i < s1.size(); i++) {
                if (s1[i] == '0') s1[i] = '1';
                else s1[i] = '0';
            }
        }

        ll k = 0;
        for (int i = 0; i < s.size(); i ++) {
            if (s[i] == '0') continue;
            if (i != 0 && s[i-1] == '0') k ++;
        }
        //cout << k << endl;

        if (s1[1] == '1') {
            ll k1 = 0;
            for (int i = s.size()-1; i >= 0; i --) {
                if (s[i] == '1') k1 ++;
                else {
                    if (k1 == 1) k --;
                    else if (k1 > 1) break;
                    k1 = 0;
                }
            }
        }
        else {
            ll k1 = 0;
            ll x = s.size();
            for (int i = s.size()-1; i >= 0; i --) {
                if (s[i] == '0') k1 ++;
                else {
                    if (k1 == 1) x = i+1;
                    else if (k1 > 1) break;
                    k1 = 0;
                }
            }
            ll y = x;
            x = -1;
            k1 = 0;
            for (int i = 0; i < s.size(); i ++) {
                if (s[i] == '0') k1 ++;
                else {
                    if (k1 == 1) x = i-1;
                    else if (k1 > 1) {
                        x = i-1;
                        break;
                    }
                    k1 = 0;
                }
            }
            //cout << x << ' ' << y << endl;
            for (int i = y; i < s.size(); i ++) {
                if (s[i] == '0') continue;
                if (s[i-1] == '0') k --;
            }
            for (int i = 0; i < min(x, y); i ++) {
                if (s[i] == '0') continue;
                if (i != 0 && s[i-1] == '0') k --;
            }
        }
        cout << k << endl;
    }
}

• Subtask 1: 1 / 1
• Subtask 2: 3 / 3
• Subtask 3: 4 / 4
• Subtask 4: 0 / 5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 7