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Always it takes a lot of time for the problems of the last rounds to have a rating, is there a reason for that!!
for ex : Codeforces Global Round 23 problems
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Rating not available for this question.
Always it takes a lot of time for the problems of the last rounds to have a rating, is there a reason for that!!
for ex : Codeforces Global Round 23 problems
This is the problem I want to discuss : 1661B - Getting Zero
I have this answer, It's not mine but I made it cleaner (I think).
#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int M = 32768;
vector<int> ans(M, -1);
ans[0] = 0;
function<int(int)> dfs = [&](int x) {
if(ans[x] != -1) return ans[x];
ans[x] = 1 + dfs(2 * x % M);
ans[x] = min(ans[x], 1 + dfs((x + 1) % M));
return ans[x];
};
int T; cin >> T;
while (T--) {
int n; cin >> n;
cout << dfs(n) << "\n";
}
return 0;
}
I have two questions and thank you in advance.
1) Why deleting this line : return ans[x]; gives wrong answer.
2) why changing the code into the 2 code below gives wrong answer :
#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int M = 32768;
vector<int> ans(M, -1);
ans[0] = 0;
function<int(int)> dfs = [&](int x) {
if(ans[x] != -1) return ans[x];
ans[x] = min(1 + dfs(2 * x % M), 1 + dfs((x + 1) % M));
return ans[x];
};
int T; cin >> T;
while (T--) {
int n; cin >> n;
cout << dfs(n) << "\n";
}
return 0;
}
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