题解 | #小乐乐改数字#

#include <iostream>
#include<stack>
#include<vector>

using namespace std;
stack<char> sta;
vector<char> arr;
int main() {
    string s;
    cin >> s;
    int i = 0;
    int c = 0;
    while (s[i] != '\0') {
        c++;
        i++;
    }
    for (int i = 0; i < c; ++i) {
        if (s[i] % 2 == 0) {
            s[i] = '0';
        } else {
            s[i] = '1';
        }
    }
    for (int i = 0; i < c; ++i) {
        sta.push(s[i]);
    }
    for (int i = 0; i < c; ++i) {
        arr.push_back(sta.top());
        sta.pop();
    }
    int j = 0;
    int count = 0;
    for (int i = 0; i < c; ++i) {
        if (arr[i] == '0') {
            count++;
        } else {
            break;
        }
    }
    int countt = 0;
    for (int i = 0; i < c; ++i) {
        if (s[i] == '0') {
            countt++;
        } else {
            break;
        }
    }
    //cout <<count<<endl;
    if (count == c) {
        cout << '0';
    } else {
        for (int i = countt; i < c; ++i) {
            cout << s[i];
        }
    }
    return 0;
}