From ed70ad308768dca59ecc82582c4a99f632408c4e Mon Sep 17 00:00:00 2001
From: ShazidMahsrafi <shazid456@gmail.com>
Date: Fri, 15 Dec 2023 12:14:47 +0600
Subject: [PATCH] added 1869A

---
 1869A Make It Zero/1869A.cpp | 99 ++++++++++++++++++++++++++++++++++++
 Readme.md                    |  1 +
 2 files changed, 100 insertions(+)
 create mode 100644 1869A Make It Zero/1869A.cpp

diff --git a/1869A Make It Zero/1869A.cpp b/1869A Make It Zero/1869A.cpp
new file mode 100644
index 0000000..6e06708
--- /dev/null
+++ b/1869A Make It Zero/1869A.cpp	
@@ -0,0 +1,99 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+// Short forms
+#define int                 long long
+#define ll                  long long
+#define endl                '\n'
+#define ff                  first
+#define ss                  second
+#define pb                  push_back
+#define all(x)              x.begin(), x.end()
+#define sz(x)               (int)(x).size()
+
+// Outputs
+#define yes                 cout<<"YES"<<endl
+#define no                  cout<<"NO"<<endl
+
+// Constants
+#define PI                  3.141592653589793238
+#define INF                 LONG_LONG_MAX
+#define MOD                 1e9+7
+
+// Faster Input Output
+#define FAST_IO             (ios_base:: sync_with_stdio(false),cin.tie(NULL));
+
+// Maths
+ll fact(ll n)          { if(n==0) return 1; ll res = 1; for (ll i = 2; i <= n; i++) res = res * i; return res; }
+ll nPr(ll n, ll r)     { return fact(n) / fact(n - r); }
+ll nCr(ll n, ll r)     { return fact(n) / (fact(r) * fact(n - r)); }
+ll gcd(ll a, ll b)     { if (b == 0) return a; return gcd(b, a % b); }
+ll lcm(ll a, ll b)     { return (a * b) / gcd(a, b);}
+ll mypow(ll a, ll b)   { ll ans = 1; while(b){ if (b&1) ans = (ans*a) ; b /= 2; a = (a*a); } return ans; }
+bool isPrime(ll n)     { if(n <= 1) return false; for(ll i = 2; i <= sqrt(n); i++) if(n % i == 0) return false; return true; }
+
+//Debugging
+#ifndef ONLINE_JUDGE
+#define dbg(x) cerr << #x <<" "; _print(x); cerr << endl;
+#define dbgin(x) cerr << #x <<" "; _print(x); cerr << ";"<<endl;
+#else
+#define dbg(x)
+#define dbgin(x)
+#endif
+ 
+void _print(int t) {cerr << t;}void _print(string t) {cerr << t;}void _print(char t) {cerr << t;}
+void _print(long double t) {cerr << t;}void _print(double t) {cerr << t;}void _print(unsigned ll t) {cerr << t;}
+template <class T, class V> void _print(pair <T, V> p);
+template <class T> void _print(vector <T> v);template <class T> void _print(set <T> v);
+template <class T, class V> void _print(map <T, V> v);template <class T> void _print(multiset <T> v);
+template <class T, class V> void _print(pair <T, V> p) {cerr << "{"; _print(p.first); cerr << ","; _print(p.second); cerr << "}";}
+template <class T> void _print(vector <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
+template <class T> void _print(set <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
+template <class T> void _print(multiset <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
+template <class T> void _print(unordered_set <T> v) {cerr<<"[ "; for(T i : v) {_print(i); cerr<<" ";} cerr<<"]";}
+template <class T, class V> void _print(map <T, V> v) {cerr << "[ "; for (auto i : v) {_print(i); cerr << " ";} cerr << "]";}
+template <class T, class V> void _print(multimap <T, V> v) {cerr << "[ "; for (auto i : v) {_print(i); cerr << " ";} cerr << "]";} 
+template <class T, class V> void _print(unordered_map <T, V> v) {cerr << "[ "; for (auto i : v) {_print(i); cerr << " ";} cerr << "]";}
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void solve()
+{
+    int n;
+    cin>>n;
+    vector<int>v(n);
+    int flag=1;
+    for(auto &x:v)
+    {
+        cin>>x;
+        if(x!=0)
+            flag=0;
+    }
+    if(flag)
+    {
+        cout<<0<<endl;
+        return;
+    }
+    if(n%2)
+    {
+        cout<<4<<endl;
+        cout<<1<<" "<<n-1<<endl;
+        cout<<1<<" "<<n-1<<endl;
+        cout<<n-1<<" "<<n<<endl;
+        cout<<n-1<<" "<<n<<endl;
+    }
+    else
+    {
+        cout<<2<<endl;
+        cout<<1<<" "<<n<<endl;
+        cout<<1<<" "<<n<<endl;
+    }
+}
+
+int32_t main()
+{
+    FAST_IO;
+    int TC = 1;
+    cin >> TC;
+    while (TC--) solve();
+}
\ No newline at end of file
diff --git a/Readme.md b/Readme.md
index cd9d5c2..5e4b3ce 100644
--- a/Readme.md
+++ b/Readme.md
@@ -163,6 +163,7 @@ Feel free to check these codes out.
 | 1863A | Channel | [Question](https://codeforces.com/problemset/problem/1863/A) |  [Solution]
 | 1864A | Increasing and Decreasing | [Question](https://codeforces.com/problemset/problem/1864/A) | [Solution]
 | 1866A | Ambitious Kid | [Question](https://codeforces.com/problemset/problem/1866/A) |  [Solution]
+| 1869A | Make It Zero | [Question](https://codeforces.com/problemset/problem/1869/A) |  [Solution]
 | 1870A | MEXanized Array | [Question](https://codeforces.com/problemset/problem/1870/A) |  [Solution]
 | 1872A | Two Vessels | [Question](https://codeforces.com/problemset/problem/1872/A) |  [Solution]
 | 1872B | The Corridor or There and Back Again | [Question](https://codeforces.com/problemset/problem/1872/B) |  [Solution]