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87 lines
4.3 KiB
87 lines
4.3 KiB
#include <stdio.h>
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#include "utils.h"
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/*
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In the 20×20 grid below, four numbers along a diagonal line have been marked in red.
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08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 12 50 77 91 08
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49 49 99 40 17 81 18 57 60 87 17 40 98 43 69 48 04 56 62 00
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81 49 31 73 55 79 14 29 93 71 40 67 53 88 30 03 49 13 36 65
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52 70 95 23 04 60 11 42 69 24 68 56 01 32 56 71 37 02 36 91
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22 31 16 71 51 67 63 89 41 92 36 54 22 40 40 28 66 33 13 80
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24 47 32 60 99 03 45 02 44 75 33 53 78 36 84 20 35 17 12 50
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32 98 81 28 64 23 67 10 26 38 40 67 59 54 70 66 18 38 64 70
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67 26 20 68 02 62 12 20 95 63 94 39 63 08 40 91 66 49 94 21
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24 55 58 05 66 73 99 26 97 17 78 78 96 83 14 88 34 89 63 72
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21 36 23 09 75 00 76 44 20 45 35 14 00 61 33 97 34 31 33 95
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78 17 53 28 22 75 31 67 15 94 03 80 04 62 16 14 09 53 56 92
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16 39 05 42 96 35 31 47 55 58 88 24 00 17 54 24 36 29 85 57
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86 56 00 48 35 71 89 07 05 44 44 37 44 60 21 58 51 54 17 58
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19 80 81 68 05 94 47 69 28 73 92 13 86 52 17 77 04 89 55 40
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04 52 08 83 97 35 99 16 07 97 57 32 16 26 26 79 33 27 98 66
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88 36 68 87 57 62 20 72 03 46 33 67 46 55 12 32 63 93 53 69
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04 42 16 73 38 25 39 11 24 94 72 18 08 46 29 32 40 62 76 36
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20 69 36 41 72 30 23 88 34 62 99 69 82 67 59 85 74 04 36 16
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20 73 35 29 78 31 90 01 74 31 49 71 48 86 81 16 23 57 05 54
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01 70 54 71 83 51 54 69 16 92 33 48 61 43 52 01 89 19 67 48
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The product of these numbers is 26 × 63 × 78 × 14 = 1788696.
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What is the greatest product of four adjacent numbers in the same direction (up, down, left, right, or diagonally) in the 20×20 grid?
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https://projecteuler.net/problem=11
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*/
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void checkForProduct(int*largestProd,int product) {
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if (product>*largestProd) {
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*largestProd=product;
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printf("Largest product is now %d\n",*largestProd);
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}
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}
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int main(int argc,char**argv) {
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int GRID[]={8,2,22,97,38,15,0,40,0,75,4,5,7,78,52,12,50,77,91,8,49,49,99,40,17,81,18,57,60,87,17,40,98,43,69,48,4,56,62,0,81,49,31,73,55,79,14,29,93,71,40,67,53,88,30,3,49,13,36,65,52,70,95,23,4,60,11,42,69,24,68,56,1,32,56,71,37,2,36,91,22,31,16,71,51,67,63,89,41,92,36,54,22,40,40,28,66,33,13,80,24,47,32,60,99,3,45,2,44,75,33,53,78,36,84,20,35,17,12,50,32,98,81,28,64,23,67,10,26,38,40,67,59,54,70,66,18,38,64,70,67,26,20,68,2,62,12,20,95,63,94,39,63,8,40,91,66,49,94,21,24,55,58,5,66,73,99,26,97,17,78,78,96,83,14,88,34,89,63,72,21,36,23,9,75,0,76,44,20,45,35,14,0,61,33,97,34,31,33,95,78,17,53,28,22,75,31,67,15,94,3,80,4,62,16,14,9,53,56,92,16,39,5,42,96,35,31,47,55,58,88,24,0,17,54,24,36,29,85,57,86,56,0,48,35,71,89,7,5,44,44,37,44,60,21,58,51,54,17,58,19,80,81,68,5,94,47,69,28,73,92,13,86,52,17,77,4,89,55,40,4,52,8,83,97,35,99,16,7,97,57,32,16,26,26,79,33,27,98,66,88,36,68,87,57,62,20,72,3,46,33,67,46,55,12,32,63,93,53,69,4,42,16,73,38,25,39,11,24,94,72,18,8,46,29,32,40,62,76,36,20,69,36,41,72,30,23,88,34,62,99,69,82,67,59,85,74,4,36,16,20,73,35,29,78,31,90,1,74,31,49,71,48,86,81,16,23,57,5,54,1,70,54,71,83,51,54,69,16,92,33,48,61,43,52,1,89,19,67,48,};
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int largestProd=0;
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for (int i=0;i<400;i++) {
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int x=i%20;
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int y=i/20;
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//Up
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if (y>=3) {
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checkForProduct(&largestProd,GRID[(y-3)*20+x]*GRID[(y-2)*20+x]*GRID[(y-1)*20+x]*GRID[i]);
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}
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//Right
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if (x<=16) {
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checkForProduct(&largestProd,GRID[(y)*20+x+1]*GRID[(y)*20+x+2]*GRID[(y)*20+x+3]*GRID[i]);
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}
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//Left
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if (x>=3) {
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checkForProduct(&largestProd,GRID[(y)*20+x-1]*GRID[(y)*20+x-2]*GRID[(y)*20+x-3]*GRID[i]);
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}
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//Down
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if (y<=16) {
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checkForProduct(&largestProd,GRID[(y+1)*20+x]*GRID[(y+2)*20+x]*GRID[(y+3)*20+x]*GRID[i]);
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}
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//Up-Left
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if (y>=3&&x>=3) {
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checkForProduct(&largestProd,GRID[(y-3)*20+x-3]*GRID[(y-2)*20+x-2]*GRID[(y-1)*20+x-1]*GRID[i]);
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}
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//Up-Right
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if (y>=3&&x<=16) {
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checkForProduct(&largestProd,GRID[(y-1)*20+x+1]*GRID[(y-2)*20+x+2]*GRID[(y-3)*20+x+3]*GRID[i]);
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}
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//Down-Left
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if (x>=3&&y<=16) {
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checkForProduct(&largestProd,GRID[(y+1)*20+x-1]*GRID[(y+2)*20+x-2]*GRID[(y+3)*20+x-3]*GRID[i]);
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}
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//Down-Right
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if (y<=16&&x<=16) {
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checkForProduct(&largestProd,GRID[(y+1)*20+x+1]*GRID[(y+2)*20+x+2]*GRID[(y+3)*20+x+3]*GRID[i]);
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}
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}
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printf("Highest product is %d",largestProd);
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return 0;
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} |