cschlyter

class Solution:
    def findCircleNum(self, isConnected: List[List[int]]) -> int:
        count = 0
        length = len(isConnected)
        
        for i in range(length):
            if isConnected[i][i] == 1:
                count += 1
                self.dfs(i, length, isConnected)
        return count

cschlyter

def river_sizes(matrix):
    sizes = []
    visited = [[False for value in row] for row in matrix]
    for i in range(len(matrix)):
        for j in range(len(matrix[i])):
            if visited[i][j]:
                continue
            traverse_node(i, j, matrix, visited, sizes)
    return sizes

cschlyter

import sys
import csv

semicolonin = csv.reader(sys.stdin, delimiter=';')
commaout = csv.writer(sys.stdout, delimiter=',')
for row in semicolonin:
	commaout.writerow(row)

cschlyter

var mongo = require('mongodb');

var Inserter = function (collection) {
    this.collection = collection;
    this.data = [];
    this.maxThreads = 6;
    this.currentThreads = 0;
    this.batchSize = 5000;
    this.queue = 0;
    this.inserted = 0;

cschlyter

function toTitleCase(str) {
    return str.replace(/\w\S*/g, function(txt){return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();});
}

cschlyter

db.zips.find({city : { $regex : /^[0-9]/ }})

cschlyter

mongoimport --db pcat --collection products < products.json

cschlyter

var mention_id = 620996;

db.mentionStats.aggregate([
    { $match: {'mention_id': mention_id}},
    { $group: {'_id': {
                    'year': { '$year': "$verification_date" },
                    'month': { '$month': "$verification_date" },
                    'day': { '$dayOfMonth': "$verification_date" }
                },
                'retweets': { $last: "$retweets" }}},

cschlyter

var start = new Date(2013, 5, 4)
var end = new Date(2013, 5, 6)
db.mention_stat.find({"verification": {"$gte": start, "$lt": end}})

cschlyter

db.link_access.group(
{
    keyf: function(doc) {
        var date = new Date(doc.date);
        var dateKey = (date.getMonth()+1)+"/"+date.getDate()+"/"+date.getFullYear()+'';
        return {'day': dateKey};
    },
    cond: {short_id: "N"},
    initial: {count:0},
    reduce: function(obj, prev) {prev.count++;}