init p1 to p9
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commit
8498165fef
9 changed files with 371 additions and 0 deletions
65
p8.c
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65
p8.c
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/*
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* http://projecteuler.net
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*
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* Projecteuler - Problem 8
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* ------------------------
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* 2009-12-28 Henrik Hautakoski
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*
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* No comment!
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*/
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#include <stdio.h>
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#define N_CHARS 1000
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#define BIGWALLOFTEXT \
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"73167176531330624919225119674426574742355349194934\
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96983520312774506326239578318016984801869478851843\
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85861560789112949495459501737958331952853208805511\
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12540698747158523863050715693290963295227443043557\
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66896648950445244523161731856403098711121722383113\
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62229893423380308135336276614282806444486645238749\
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30358907296290491560440772390713810515859307960866\
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70172427121883998797908792274921901699720888093776\
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65727333001053367881220235421809751254540594752243\
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52584907711670556013604839586446706324415722155397\
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53697817977846174064955149290862569321978468622482\
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83972241375657056057490261407972968652414535100474\
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82166370484403199890008895243450658541227588666881\
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16427171479924442928230863465674813919123162824586\
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17866458359124566529476545682848912883142607690042\
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24219022671055626321111109370544217506941658960408\
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07198403850962455444362981230987879927244284909188\
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84580156166097919133875499200524063689912560717606\
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05886116467109405077541002256983155200055935729725\
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71636269561882670428252483600823257530420752963450"
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int product(char *ptr, int n) {
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int i, r = 1;
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for(i=0; i < n; i++)
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r *= ((int)ptr[i]) - 0x30;
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return r;
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}
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int main() {
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int i;
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char str[] = BIGWALLOFTEXT;
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int tmp, r = 0;
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for(i=0; i < N_CHARS-5; i++) {
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tmp = product(&str[i], 5);
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if (tmp > r)
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r = tmp;
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}
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printf("%i\n", r);
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return 0;
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}
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