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# Euler's Formula

Author: Benjamin Qi

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

## Introduction

### This section is not complete.

Any help would be appreciated! Just submit a Pull Request on Github.

## Example 1

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

APIO | Very Hard | ## Show Tags2DRQ, Euler's Formula, Persistent Segtree |

### This section is not complete.

Any help would be appreciated! Just submit a Pull Request on Github.

## Example 2

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

Plat | Very Hard |

### This section is not complete.

Any help would be appreciated! Just submit a Pull Request on Github.

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

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

Kattis | Very Hard | ## Show TagsDSU, Euler's Formula | |||

CF | Very Hard | ## Show TagsEuler's Formula, FFT | |||

CF | Very Hard | ## Show TagsEuler's Formula | |||

Plat | Very Hard | ## Show TagsEuler's Formula |

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