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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 |
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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 |
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import sys | |
import csv | |
semicolonin = csv.reader(sys.stdin, delimiter=';') | |
commaout = csv.writer(sys.stdout, delimiter=',') | |
for row in semicolonin: | |
commaout.writerow(row) |
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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; |
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function toTitleCase(str) { | |
return str.replace(/\w\S*/g, function(txt){return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();}); | |
} |
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db.zips.find({city : { $regex : /^[0-9]/ }}) |
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mongoimport --db pcat --collection products < products.json |
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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" }}}, |
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var start = new Date(2013, 5, 4) | |
var end = new Date(2013, 5, 6) | |
db.mention_stat.find({"verification": {"$gte": start, "$lt": end}}) |
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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++;} |
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