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# Euler's Formula

Author: Benjamin Qi

### Prerequisites

A formula for finding the number of faces in a planar graph.

## Introduction

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## Example 1

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## Example 2

Status | Source | Problem Name | Difficulty | Tags | Solution | URL |
---|---|---|---|---|---|---|

Plat | Very Hard | External Sol |

### This section is not complete.

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int N, h[750][750];ll ans;vector<pair<int,pi>> v;int hsh(int a, int b) {return N*a+b;}const int xd[4] = {1,0,-1,0}, yd[4] = {0,1,0,-1};

## Problems

### Module Progress:

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