CodeForces Div 3 - D, C++ (gcc)

Language: Layout:

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define first F
#define second S

void solve() {
    int n, s;
    cin >> n >> s;
    vector<int> ans;
    while(n > 0) {
        ans.push_back(n % 10);
        n /= 10;
    }
    ans.push_back(0);
    // reverse(ans.begin(), ans.end());
    int sum = 0;
    for(auto x: ans) {
        sum += x;
    }
    int c = 0;
    int move[ans.size()] = {0};
    for(int i = 0; i < ans.size() - 1; i++) {
        if(sum > s) {
            if(ans[i] + c == 0) {
                move[i] = 0;
                c = 0;
                sum -= ans[i];
                continue;
            }
            move[i] = 10 - (ans[i] + c);
            sum -= ans[i];
            c = 1;
        } else {
            break;
        }
    }
    int res = 0;
    int j = 1;
    for(auto x : move) {
        cout << x << " ";
        res += x * j;
        j *= 10;
    }
    cout << "\n";
    cout << res <<"\n";
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int t = 1;
    cin >> t;
    while(t--) {
        solve();
    }
    return 0;
}

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Compilation time: 1.12 sec, absolute running time: 0.15 sec, cpu time: 0.01 sec, memory peak: 6 Mb, absolute service time: 1,3 sec