From ef9dfb5d8bfa705a0c056a2652d298e5ebb763fb Mon Sep 17 00:00:00 2001
From: omagdy7 <omar.professional8777@gmail.com>
Date: Wed, 22 Feb 2023 20:18:04 +0200
Subject: Solved a bunch of problems

---
 codeforces/FlipFlopSum/main.cpp | 107 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100755 codeforces/FlipFlopSum/main.cpp

(limited to 'codeforces/FlipFlopSum/main.cpp')

diff --git a/codeforces/FlipFlopSum/main.cpp b/codeforces/FlipFlopSum/main.cpp
new file mode 100755
index 0000000..7de31f6
--- /dev/null
+++ b/codeforces/FlipFlopSum/main.cpp
@@ -0,0 +1,107 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+using ll = long long;
+using pi = pair<int, int>;
+using vpi = vector<pi>;
+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
+
+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};
+
+//pretty printing
+template<typename K, typename V>
+void printm(const map<K, V> &mp) {
+  cerr << "{" << endl;
+  for (auto p : mp) {
+    cerr << "  { " << p.first << " : " << p.second << " }\n";
+  }
+  cerr << "}" << endl;
+}
+template<typename T>
+void printv(const vector<T> &v) {
+  cerr << "[";
+  for (int i = 0; i < v.size(); i++) {
+    if (i == v.size() - 1) {
+      cerr << v[i];
+    } else {
+      cerr << v[i] << ", ";
+    }
+  }
+  cerr << "]\n";
+}
+
+template<typename T>
+void printvv(const vector<vector<T>> &v) {
+  cerr << "[\n";
+  for (auto &vec : v) {
+    cout << "  ";
+    printv(vec);
+  }
+  cerr << "]\n";
+}
+void print() {
+  cerr << "\n";
+}
+
+template<typename T, typename... TS>
+void print(T val, TS... vals) {
+  cerr << val << " ";
+  print(vals...);
+}
+
+
+/* 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
+ */
+
+void solve() {
+  int n;
+  cin >> n;
+  vi v(n);
+  for (auto &x : v) cin >> x;
+  int flag = 0;
+  for (int i = 0; i < n - 1; i++) {
+    if (v[i] == v[i + 1] && v[i] == -1) {
+      flag = 1;
+      break;
+    } 
+  }
+  if (std::accumulate(all(v), 0) == v.size()) {
+    cout << std::accumulate(all(v), -4) << '\n';
+  } else if (flag == 1) {
+    cout << std::accumulate(all(v), 4) << '\n';
+  } else {
+    cout << std::accumulate(all(v), 0) << '\n';
+  }
+
+}
+
+int main () {
+  ios_base::sync_with_stdio(false);
+  cin.tie(NULL);
+  int tt;
+  cin >> tt;
+  while(tt--) {
+    solve();
+  }
+}
+
+
-- 
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