Important topic:

 C# topic:

OOPs, Inheritance,  Abstraction, Polymorphism, Encapsulation.

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template

 **** Combinatorics **** const ll M = 1e9+7;  // default modulus // --- Basic modular operations --- ll mod(ll x, ll m = M){      return ((x % m) + m) % m;  } ll mod_add(ll a, ll b, ll m = M){      return (a + b) % m;  } ll mod_sub(ll a, ll b, ll m = M){      return ((a - b) % m + m) % m;  } ll mod_mul(ll a, ll b, ll m = M){     return ((a % m) * (b % m)) % m; // safe for small numbers } ll mod_pow(ll a, ll b, ll m = M) {     ll res = 1;     a %= m;     while(b) {         if(b & 1) res = (res * a) % m;         a = (a * a) % m;         b >>= 1;     }     return res; } // --- Modular inverse for prime modulus --- // Fermat's Little Theorem: a^(m-2) ≡ a^(-1) (mod m) ll mod_inv_prime(ll a, ll m = M){     return mod_pow(a, m - 2, m); } // --- Modular inverse for non-prime modulus --- /...
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settings.json

 {     "editor.fontFamily": "'Fira Code', Consolas, monospace",     "editor.fontLigatures": true,     "editor.fontWeight": "normal",     "editor.fontSize": 18,     "editor.lineHeight": 26,     "editor.wordWrap": "on",     "editor.cursorBlinking": "smooth",     "editor.cursorStyle": "underline",     "editor.cursorWidth": 5,     "editor.cursorSmoothCaretAnimation": "off",     "editor.smoothScrolling": false,     "editor.mouseWheelSmoothScroll": false,     "workbench.reduceMotion": "on",     "editor.scrollBeyondLastLine": false,     "editor.scrollBeyondLastColumn": false,     "editor.fastScrollSensitivity": 20,     "editor.allowVariableLineHeights": false,     "files.autoSave": "onFocusChange",     "explorer.confirmDelet...
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