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Level 2 Class 1/Practice G4/Week 12/C.cpp

@@ -0,0 +1,58 @@
+#include<bits/stdc++.h>
+#include <ext/pb_ds/tree_policy.hpp>
+#include <ext/pb_ds/assoc_container.hpp>
+
+using namespace __gnu_pbds;
+using namespace std;
+
+template<typename T>
+using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
+#define ll long long
+#define endl '\n'
+
+
+int main() {
+    ios::sync_with_stdio(false);
+    cout.tie(nullptr);
+    cin.tie(nullptr);
+    int t;
+    cin >> t;
+    while (t--) {
+        int n, m;
+        cin >> n >> m;
+        map<int,int> mp;
+        for (int i = 0; i < n; ++i) {
+            int x;
+            cin >> x;
+            mp[x%m]++;
+        }
+        int cnt = 0;
+        for (int i = 0; i < m; ++i) {
+            int rem = i , com = (m-i)%m;
+            int mn = min(mp[rem] , mp[com]);
+            if ( mn > 0)
+            {
+                cnt++;
+                mp[rem] -=mn;
+                mp[com] -=mn;
+            }
+            if ( mp[rem] > 0)
+            {
+                cnt += ( mp[rem] - 1);
+                if ( mn == 0)
+                    cnt++;
+                mp[rem] =0;
+            }
+            else if ( mp[com] > 0)
+            {
+                cnt += (mp[com] -1);
+                if ( mn == 0)
+                    cnt++;
+                mp[com] = 0;
+            }
+            mp[com] = mp[rem] = 0;
+        }
+        cout << cnt << endl;
+    }
+    return 0;
+}

Level 2 Class 1/Practice G4/Week 12/D.cpp

@@ -0,0 +1,39 @@
+#include<bits/stdc++.h>
+#include <ext/pb_ds/tree_policy.hpp>
+#include <ext/pb_ds/assoc_container.hpp>
+
+using namespace __gnu_pbds;
+using namespace std;
+
+template<typename T>
+using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
+#define ll long long
+#define endl '\n'
+
+
+int main() {
+    ios::sync_with_stdio(false);
+    cout.tie(nullptr);
+    cin.tie(nullptr);
+    int t;
+    cin >> t;
+    while (t--) {
+        ll n;
+        cin >> n;
+        while (true)
+        {
+            ll sum =0;
+            string s = to_string(n);
+            for (int i = 0; i < s.size(); ++i) {
+                sum += ( s[i] - '0');
+            }
+            if (__gcd(n,sum) > 1)
+            {
+                cout << n << endl;
+                break;
+            }
+            n++;
+        }
+    }
+    return 0;
+}

Level 2 Class 1/Practice G4/Week 12/E.cpp

@@ -0,0 +1,39 @@
+#include<bits/stdc++.h>
+#include <ext/pb_ds/tree_policy.hpp>
+#include <ext/pb_ds/assoc_container.hpp>
+
+using namespace __gnu_pbds;
+using namespace std;
+
+template<typename T>
+using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
+#define ll long long
+#define endl '\n'
+
+
+int main() {
+    ios::sync_with_stdio(false);
+    cout.tie(nullptr);
+    cin.tie(nullptr);
+    int t;
+    cin >> t;
+    while (t--) {
+      int n;
+      cin >> n;
+      deque<int> v = {1,1};
+        for (int i = 0; i < n-2; ++i) {
+            v.push_back(0);
+        }
+        for (int i = 0; i < n; ++i) {
+            for (int j = 0; j < n; ++j) {
+                cout << v[j] << " ";
+            }
+            cout << endl;
+            v.push_back(v.front());
+            v.pop_front();
+        }
+        
+
+    }
+    return 0;
+}

Level 2 Class 1/Practice G4/Week 12/F.cpp

@@ -0,0 +1,45 @@
+#include<bits/stdc++.h>
+#include <ext/pb_ds/tree_policy.hpp>
+#include <ext/pb_ds/assoc_container.hpp>
+
+using namespace __gnu_pbds;
+using namespace std;
+
+template<typename T>
+using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
+#define ll long long
+#define endl '\n'
+
+
+int main() {
+    ios::sync_with_stdio(false);
+    cout.tie(nullptr);
+    cin.tie(nullptr);
+    int t;
+    cin >> t;
+    while (t--) {
+      int n;
+      cin >> n;
+      int a[n];
+        for (int i = 0; i < n; ++i) {
+            cin >> a[i];
+        }
+        int idx = -1;
+        int mx =  *max_element(a,a+n);
+        for (int i = 0; i < n; ++i) {
+            if ( a[i] == mx)
+            {
+                if ( i && a[i-1] < a[i])
+                    idx = i;
+                if ( i+1 < n && a[i+1] < a[i])
+                    idx = i;
+            }
+        }
+        if ( idx == -1 )
+            cout << -1 << endl;
+        else
+            cout << idx+1 << endl;
+
+    }
+    return 0;
+}

Level 2 Class 1/Practice G4/Week 12/G.cpp

@@ -0,0 +1,50 @@
+#include<bits/stdc++.h>
+#include <ext/pb_ds/tree_policy.hpp>
+#include <ext/pb_ds/assoc_container.hpp>
+
+using namespace __gnu_pbds;
+using namespace std;
+
+template<typename T>
+using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
+#define ll long long
+#define endl '\n'
+
+
+int main() {
+    ios::sync_with_stdio(false);
+    cout.tie(nullptr);
+    cin.tie(nullptr);
+    int n,m;
+    cin >> n  >> m;
+    int a[n][m],b[n][m];
+    for (int i = 0; i < n; ++i) {
+        for (int j = 0; j < m; ++j) {
+            cin >> a[i][j];
+            b[i][j] =0;
+        }
+    }
+    vector<pair<int,int>> v;
+    for (int i = 0; i < n-1; ++i) {
+        for (int j = 0; j < m-1; ++j) {
+            if ( a[i][j]  + a[i+1][j] + a[i][j+1]+a[i+1][j+1] == 4)
+            {
+                v.push_back({i+1,j+1});
+                b[i][j] =  b[i+1][j] = b[i][j+1]=b[i+1][j+1] = 1;
+            }
+        }
+    }
+    for (int i = 0; i < n; ++i) {
+        for (int j = 0; j < m; ++j) {
+            if ( a[i][j] != b[i][j])
+            {
+                cout << -1 << endl;
+                return  0;
+            }
+        }
+    }
+    cout << v.size() << endl;
+    for(auto it : v)
+        cout << it.first << " " << it.second << endl;
+    return 0;
+}