CCC 2022 J3 CCC '22 J3 - Harp Tuning

    1#include <bits/stdc++.h>
    2using namespace std;
    3typedef long long ll;
    4const int inf = 1e9;
    5const long long INF = 1e17; //❄️
    6int main() {
    7    ios::sync_with_stdio(0); cin.tie(0); 
    8    string s; cin >> s;
    9    string ans = "";
    10    for (int i = 0, j; i < s.size(); i++, j = i) {
    11        char c = s[i];
    12        if (c == '+') { 
    13            ans += " tighten ";
    14        } else if (c == '-') {
    15            ans += " loosen ";
    16        } else if (isalpha(c)) {
    17            ans += c;
    18        } else if (isdigit(c)) {
    19            while (isdigit(c)) {
    20                ans += c;
    21                j++;
    22                c = s[j];
    23            }
    24            i = j - 1;
    25            cout << ans << '\n';
    26            ans = "";
    27        }
    28    }
    29    return 0;
    30}