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freeCodeCamp/curriculum/challenges/english/10-coding-interview-prep/project-euler/problem-13-large-sum.md

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feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
---
id: 5900f37a1000cf542c50fe8c
title: 'Problem 13: Large sum'
Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format.
2020-11-27 18:02:05 +00:00
challengeType: 5
fix(curriculum): Added forumTopicId to remaining 1200 challeng… (#36558)
2019-08-05 16:17:33 +00:00
forumTopicId: 301757
feat(curriculum): restore seed + solution to Chinese (#40683) * feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
2021-01-13 02:31:00 +00:00
dashedName: problem-13-large-sum
feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
---
Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format.
2020-11-27 18:02:05 +00:00
# --description--
fix: improve Project Euler descriptions, challenge seeds, and test cases (#38016) * fix: improve Project Euler descriptions and test case Improve formatting of Project Euler test descriptions. Also add poker hands array and new test case for problem 54 * feat: add typeof tests and gave functions proper names for first 100 challenges * fix: continue fixing test descriptions and adding "before test" sections * fix: address review comments * fix: adjust grids in 18 and 67 and fix some text that reference files rather than the given arrays * fix: implement bug fixes and improvements from review * fix: remove console.log statements from seed and solution
2020-02-28 12:39:47 +00:00
feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
Work out the first ten digits of the sum of the following one-hundred 50-digit numbers.
fix: improve Project Euler descriptions, challenge seeds, and test cases (#38016) * fix: improve Project Euler descriptions and test case Improve formatting of Project Euler test descriptions. Also add poker hands array and new test case for problem 54 * feat: add typeof tests and gave functions proper names for first 100 challenges * fix: continue fixing test descriptions and adding "before test" sections * fix: address review comments * fix: adjust grids in 18 and 67 and fix some text that reference files rather than the given arrays * fix: implement bug fixes and improvements from review * fix: remove console.log statements from seed and solution
2020-02-28 12:39:47 +00:00
<div style='padding-left: 4em;'>
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</div>
Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format.
2020-11-27 18:02:05 +00:00
# --hints--
feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format.
2020-11-27 18:02:05 +00:00
`largeSum(testNums)` should return a number.
feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format.
2020-11-27 18:02:05 +00:00
```js
assert(typeof largeSum(testNums) === 'number');
feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
```
Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format.
2020-11-27 18:02:05 +00:00
`largeSum(testNums)` should return 8348422521.
feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
```js
Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format.
2020-11-27 18:02:05 +00:00
assert.strictEqual(largeSum(testNums), 8348422521);
```
feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format.
2020-11-27 18:02:05 +00:00
`largeSum(fiftyDigitNums)` should return 5537376230.
feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format.
2020-11-27 18:02:05 +00:00
```js
assert.strictEqual(largeSum(fiftyDigitNums), 5537376230);
feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
```
Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format.
2020-11-27 18:02:05 +00:00
# --seed--
feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format.
2020-11-27 18:02:05 +00:00
## --before-user-code--
feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
```js
const fiftyDigitNums = [
'37107287533902102798797998220837590246510135740250',
'46376937677490009712648124896970078050417018260538',
'74324986199524741059474233309513058123726617309629',
'91942213363574161572522430563301811072406154908250',
'23067588207539346171171980310421047513778063246676',
'89261670696623633820136378418383684178734361726757',
'28112879812849979408065481931592621691275889832738',
'44274228917432520321923589422876796487670272189318',
'47451445736001306439091167216856844588711603153276',
'70386486105843025439939619828917593665686757934951',
'62176457141856560629502157223196586755079324193331',
'64906352462741904929101432445813822663347944758178',
'92575867718337217661963751590579239728245598838407',
'58203565325359399008402633568948830189458628227828',
'80181199384826282014278194139940567587151170094390',
'35398664372827112653829987240784473053190104293586',
'86515506006295864861532075273371959191420517255829',
'71693888707715466499115593487603532921714970056938',
'54370070576826684624621495650076471787294438377604',
'53282654108756828443191190634694037855217779295145',
'36123272525000296071075082563815656710885258350721',
'45876576172410976447339110607218265236877223636045',
'17423706905851860660448207621209813287860733969412',
'81142660418086830619328460811191061556940512689692',
'51934325451728388641918047049293215058642563049483',
'62467221648435076201727918039944693004732956340691',
'15732444386908125794514089057706229429197107928209',
'55037687525678773091862540744969844508330393682126',
'18336384825330154686196124348767681297534375946515',
'80386287592878490201521685554828717201219257766954',
'78182833757993103614740356856449095527097864797581',
'16726320100436897842553539920931837441497806860984',
'48403098129077791799088218795327364475675590848030',
'87086987551392711854517078544161852424320693150332',
'59959406895756536782107074926966537676326235447210',
'69793950679652694742597709739166693763042633987085',
'41052684708299085211399427365734116182760315001271',
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'34413065578016127815921815005561868836468420090470',
'23053081172816430487623791969842487255036638784583',
'11487696932154902810424020138335124462181441773470',
'63783299490636259666498587618221225225512486764533',
'67720186971698544312419572409913959008952310058822',
'95548255300263520781532296796249481641953868218774',
'76085327132285723110424803456124867697064507995236',
'37774242535411291684276865538926205024910326572967',
'23701913275725675285653248258265463092207058596522',
'29798860272258331913126375147341994889534765745501',
'18495701454879288984856827726077713721403798879715',
'38298203783031473527721580348144513491373226651381',
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'29746152185502371307642255121183693803580388584903',
'41698116222072977186158236678424689157993532961922',
'62467957194401269043877107275048102390895523597457',
'23189706772547915061505504953922979530901129967519',
'86188088225875314529584099251203829009407770775672',
'11306739708304724483816533873502340845647058077308',
'82959174767140363198008187129011875491310547126581',
'97623331044818386269515456334926366572897563400500',
'42846280183517070527831839425882145521227251250327',
'55121603546981200581762165212827652751691296897789',
'32238195734329339946437501907836945765883352399886',
'75506164965184775180738168837861091527357929701337',
'62177842752192623401942399639168044983993173312731',
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'99518671430235219628894890102423325116913619626622',
'73267460800591547471830798392868535206946944540724',
'76841822524674417161514036427982273348055556214818',
'97142617910342598647204516893989422179826088076852',
'87783646182799346313767754307809363333018982642090',
'10848802521674670883215120185883543223812876952786',
'71329612474782464538636993009049310363619763878039',
'62184073572399794223406235393808339651327408011116',
'66627891981488087797941876876144230030984490851411',
'60661826293682836764744779239180335110989069790714',
'85786944089552990653640447425576083659976645795096',
'66024396409905389607120198219976047599490197230297',
'64913982680032973156037120041377903785566085089252',
'16730939319872750275468906903707539413042652315011',
'94809377245048795150954100921645863754710598436791',
'78639167021187492431995700641917969777599028300699',
'15368713711936614952811305876380278410754449733078',
'40789923115535562561142322423255033685442488917353',
'44889911501440648020369068063960672322193204149535',
'41503128880339536053299340368006977710650566631954',
'81234880673210146739058568557934581403627822703280',
'82616570773948327592232845941706525094512325230608',
'22918802058777319719839450180888072429661980811197',
'77158542502016545090413245809786882778948721859617',
'72107838435069186155435662884062257473692284509516',
'20849603980134001723930671666823555245252804609722',
'53503534226472524250874054075591789781264330331690'
];
const testNums = [
'37107287533902102798797998220837590246510135740250',
'46376937677490009712648124896970078050417018260538'
];
```
Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format.
2020-11-27 18:02:05 +00:00
## --seed-contents--
```js
function largeSum(arr) {
return true;
}
feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format.
2020-11-27 18:02:05 +00:00
// Only change code above this line
feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format.
2020-11-27 18:02:05 +00:00
const testNums = [
'37107287533902102798797998220837590246510135740250',
'46376937677490009712648124896970078050417018260538'
];
feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format.
2020-11-27 18:02:05 +00:00
largeSum(testNums);
```
feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
Feat: add new Markdown parser (#39800) and change all the challenges to new `md` format.
2020-11-27 18:02:05 +00:00
# --solutions--
feat(challenge-md): Add initial markdown challenge files
2018-09-30 22:01:58 +00:00
```js
function largeSum(arr) {
let sum = 0;
arr.forEach(function(num) {
sum += parseInt(num, 10);
});
sum = sum.toString(10);
sum = sum.substr(0, 1) + sum.substr(2);
let firstTen = sum.slice(0, 10);
return parseInt(firstTen, 10);
}
```