Solved 3 problems in the last Div3

1 files changed, 82 insertions, 0 deletions

diff --git a/codeforces/TurtleMath/main.cpp b/codeforces/TurtleMath/main.cpp
new file mode 100755
index 0000000..c602443
--- /dev/null
+++ b/codeforces/TurtleMath/main.cpp
@@ -0,0 +1,82 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+using ll = long long;
+using pii = pair<int, int>;
+using vpii = vector<pii>;
+using vi = vector<int>;
+using vll = vector<long long>;
+using mpii = map<int, int>;
+using mpll = map<ll, ll>;
+using db = long double;
+
+#define pb push_back
+#define all(x) (x).begin(), (x).end()
+#define rall(x) (x).rbegin(), (x).rend()
+#define lb lower_bound
+#define ub upper_bound
+#define make_unique(x)                                                         \
+  sort(all((x)));                                                              \
+  (x).resize(unique(all((x))) - (x).begin())
+#define ceil(a, b) ((a) + (b)-1) / (b)
+
+const int mod = (int)1e9 + 7;
+const db pi = acos((db)-1);
+const int dx[4]{1, 0, -1, 0};
+const int dy[4]{0, 1, 0, -1};
+
+#ifdef LOCAL
+#include "debug.h"
+#else
+#define dbg(...) 42
+#endif
+
+/* stuff you should look for:
+  ---------------------------
+   * special cases (n=1?)
+   * int overflow, array bounds
+   * do smth instead of nothing and stay organized
+   * WRITE STUFF DOWN
+   * DON'T GET STUCK ON ONE APPROACH
+ */
+
+set<int> st1;
+
+void solve() {
+  int n;
+  cin >> n;
+  vector<int> v(n);
+  long long sum = 0;
+  for (auto &x : v) {
+    cin >> x;
+    sum += x;
+  }
+  if (sum % 3 == 0) {
+    cout << 0 << '\n';
+    return;
+  } else {
+    if (sum % 3 == 1) {
+      for (int i = 0; i < n; ++i) {
+        if (st1.count(v[i])) {
+          cout << 1 << '\n';
+          return;
+        }
+      }
+    }
+  }
+  cout << 3 - (sum % 3) << '\n';
+}
+
+int main() {
+  for (int i = 0; i < 1e5; i++) {
+    st1.insert(1 + i * 3);
+  }
+  ios_base::sync_with_stdio(false);
+  cin.tie(NULL);
+  int tt;
+  cin >> tt;
+  while (tt--) {
+    solve();
+  }
+}