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Author: MathProgrammer

2022/Contests/Div 2/778/Programs/Alice and the Cake.cpp

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+#include <iostream>
+#include <vector>
+#include <algorithm>
+#include <set>
+
+using namespace std;
+
+void solve()
+{
+    int no_of_elements;
+    cin >> no_of_elements;
+
+    long long sum = 0, minimum = 1e12, maximum = 0;
+    multiset <long long> S, original_S;
+    vector <long long> A(no_of_elements + 1);
+    for(int i = 1; i <= no_of_elements; i++)
+    {
+        cin >> A[i];
+
+        original_S.insert(A[i]);
+
+        sum += A[i];
+        minimum = min(minimum, A[i]);
+        maximum = max(maximum, A[i]);
+    }
+
+    S.insert(sum);
+
+    int possible = true;
+    while(S.size() > 0 && *(S.begin()) >= minimum && *(S.rbegin()) >= *(original_S.rbegin()))
+    {
+        auto it1 = (S.rbegin());
+        long long x = *it1;
+
+        if(original_S.count(x) > 0)
+        {
+            original_S.erase(original_S.find(x));
+            S.erase(S.find(x));
+
+            continue;
+        }
+
+        S.erase(S.find(x));
+        long long new_x = x/2, new_y = x/2 + (x%2 != 0);
+
+
+        S.insert(new_x);
+        S.insert(new_y);
+    }
+
+    possible = (S.size() == 0);
+
+    cout << (possible ? "YES" : "NO") << "\n";
+}
+
+int main()
+{
+    ios_base::sync_with_stdio(false);
+    cin.tie(NULL);
+
+    int no_of_test_cases;
+    cin >> no_of_test_cases;
+
+    while(no_of_test_cases--)
+        solve();
+
+    return 0;
+}
+

2022/Contests/Div 2/778/Programs/Prefix Removals.cpp

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+#include <iostream>
+#include <vector>
+#include <algorithm>
+
+using namespace std;
+
+void solve()
+{
+    string S;
+    cin >> S;
+
+    const int NO_OF_ALPHABETS = 26;
+    vector <int> frequency(NO_OF_ALPHABETS + 1, 0);
+    for(int i = 0; i < S.size(); i++)
+    {
+        frequency[S[i] - 'a']++;
+    }
+
+    int start = 0;
+    for(int i = 0; i < S.size(); i++)
+    {
+        if(frequency[S[i] - 'a'] == 1)
+        {
+            start = i;
+            break;
+        }
+
+        frequency[S[i] - 'a']--;
+    }
+
+    string answer;
+    for(int i = start; i < S.size(); i++)
+    {
+        answer += S[i];
+    }
+
+    cout << answer << "\n";
+}
+
+int main()
+{
+    int no_of_test_cases;
+    cin >> no_of_test_cases;
+
+    while(no_of_test_cases--)
+        solve();
+
+    return 0;
+}
+