Project Euler Problem 11: Largest product in a grid
2017-03-20 20:39
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Largest product in a grid
Problem 11
In the 20×20 grid below, four numbers along a diagonal line have been marked in red.
08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 12 50 77 91 08
49 49 99 40 17 81 18 57 60 87 17 40 98 43 69 48 04 56 62 00
81 49 31 73 55 79 14 29 93 71 40 67 53 88 30 03 49 13 36 65
52 70 95 23 04 60 11 42 69 24 68 56 01 32 56 71 37 02 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 03 45 02 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 02 62 12 20 95 63 94 39 63 08 40 91 66 49 94 21
24 55 58 05 66 73 99 26 97 17 78 78 96 83 14 88 34 89 63 72
21 36 23 09 75 00 76 44 20 45 35 14 00 61 33 97 34 31 33 95
78 17 53 28 22 75 31 67 15 94 03 80 04 62 16 14 09 53 56 92
16 39 05 42 96 35 31 47 55 58 88 24 00 17 54 24 36 29 85 57
86 56 00 48 35 71 89 07 05 44 44 37 44 60 21 58 51 54 17 58
19 80 81 68 05 94 47 69 28 73 92 13 86 52 17 77 04 89 55 40
04 52 08 83 97 35 99 16 07 97 57 32 16 26 26 79 33 27 98 66
88 36 68 87 57 62 20 72 03 46 33 67 46 55 12 32 63 93 53 69
04 42 16 73 38 25 39 11 24 94 72 18 08 46 29 32 40 62 76 36
20 69 36 41 72 30 23 88 34 62 99 69 82 67 59 85 74 04 36 16
20 73 35 29 78 31 90 01 74 31 49 71 48 86 81 16 23 57 05 54
01 70 54 71 83 51 54 69 16 92 33 48 61 43 52 01 89 19 67 48
The product of these numbers is 26 × 63 × 78 × 14 = 1788696.
What is the greatest product of four adjacent numbers in the same direction (up, down, left, right, or diagonally) in the 20×20 grid?
C++(Faster):
#include <iostream>
using namespace std;
const int MAXN = 20;
const int TWO = 2;
const int FOUR = 4;
int grid[MAXN][MAXN];
int product2[MAXN][MAXN];
int main()
{
int maxproduct = 0, temp;
for(int i=0; i<MAXN; i++)
for(int j=0; j<MAXN; j++)
cin >> grid[i][j];
for(int i=0; i<MAXN-TWO; i++)
for(int j=0; j<MAXN-TWO; j++)
product2[i][j] = grid[i][j] * grid[i+1][j+1];
for(int i=0; i<MAXN-FOUR; i++)
for(int j=0; j<MAXN-FOUR; j++) {
temp = product2[i][j] * product2[i+2][j+2];
if(temp > maxproduct)
maxproduct = temp;
}
for(int i=0; i<MAXN-TWO; i++)
for(int j=0; j<MAXN-TWO; j++)
product2[i][j] = grid[i][j+3] * grid[i+1][j+2];
for(int i=0; i<MAXN-FOUR; i++)
for(int j=0; j<MAXN-FOUR; j++) {
temp = product2[i][j+3] * product2[i+2][j+1];
if(temp > maxproduct)
maxproduct = temp;
}
for(int i=0; i<MAXN; i++)
for(int j=0; j<MAXN-TWO; j++)
product2[i][j] = grid[i][j] * grid[i][j+1];
for(int i=0; i<MAXN; i++)
for(int j=0; j<MAXN-FOUR; j++) {
temp = product2[i][j] * product2[i][j+2];
if(temp > maxproduct)
maxproduct = temp;
}
for(int i=0; i<MAXN; i++)
for(int j=0; j<MAXN-TWO; j++)
product2[j][i] = grid[j][i] * grid[j][i+1];
for(int i=0; i<MAXN; i++)
for(int j=0; j<MAXN-FOUR; j++) {
temp = product2[j][i] * product2[j][i+2];
if(temp > maxproduct)
maxproduct = temp;
}
cout << maxproduct << endl;
return 0;
}
C++:
Input data:
Problem 11
In the 20×20 grid below, four numbers along a diagonal line have been marked in red.
08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 12 50 77 91 08
49 49 99 40 17 81 18 57 60 87 17 40 98 43 69 48 04 56 62 00
81 49 31 73 55 79 14 29 93 71 40 67 53 88 30 03 49 13 36 65
52 70 95 23 04 60 11 42 69 24 68 56 01 32 56 71 37 02 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 03 45 02 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 02 62 12 20 95 63 94 39 63 08 40 91 66 49 94 21
24 55 58 05 66 73 99 26 97 17 78 78 96 83 14 88 34 89 63 72
21 36 23 09 75 00 76 44 20 45 35 14 00 61 33 97 34 31 33 95
78 17 53 28 22 75 31 67 15 94 03 80 04 62 16 14 09 53 56 92
16 39 05 42 96 35 31 47 55 58 88 24 00 17 54 24 36 29 85 57
86 56 00 48 35 71 89 07 05 44 44 37 44 60 21 58 51 54 17 58
19 80 81 68 05 94 47 69 28 73 92 13 86 52 17 77 04 89 55 40
04 52 08 83 97 35 99 16 07 97 57 32 16 26 26 79 33 27 98 66
88 36 68 87 57 62 20 72 03 46 33 67 46 55 12 32 63 93 53 69
04 42 16 73 38 25 39 11 24 94 72 18 08 46 29 32 40 62 76 36
20 69 36 41 72 30 23 88 34 62 99 69 82 67 59 85 74 04 36 16
20 73 35 29 78 31 90 01 74 31 49 71 48 86 81 16 23 57 05 54
01 70 54 71 83 51 54 69 16 92 33 48 61 43 52 01 89 19 67 48
The product of these numbers is 26 × 63 × 78 × 14 = 1788696.
What is the greatest product of four adjacent numbers in the same direction (up, down, left, right, or diagonally) in the 20×20 grid?
C++(Faster):
#include <iostream>
using namespace std;
const int MAXN = 20;
const int TWO = 2;
const int FOUR = 4;
int grid[MAXN][MAXN];
int product2[MAXN][MAXN];
int main()
{
int maxproduct = 0, temp;
for(int i=0; i<MAXN; i++)
for(int j=0; j<MAXN; j++)
cin >> grid[i][j];
for(int i=0; i<MAXN-TWO; i++)
for(int j=0; j<MAXN-TWO; j++)
product2[i][j] = grid[i][j] * grid[i+1][j+1];
for(int i=0; i<MAXN-FOUR; i++)
for(int j=0; j<MAXN-FOUR; j++) {
temp = product2[i][j] * product2[i+2][j+2];
if(temp > maxproduct)
maxproduct = temp;
}
for(int i=0; i<MAXN-TWO; i++)
for(int j=0; j<MAXN-TWO; j++)
product2[i][j] = grid[i][j+3] * grid[i+1][j+2];
for(int i=0; i<MAXN-FOUR; i++)
for(int j=0; j<MAXN-FOUR; j++) {
temp = product2[i][j+3] * product2[i+2][j+1];
if(temp > maxproduct)
maxproduct = temp;
}
for(int i=0; i<MAXN; i++)
for(int j=0; j<MAXN-TWO; j++)
product2[i][j] = grid[i][j] * grid[i][j+1];
for(int i=0; i<MAXN; i++)
for(int j=0; j<MAXN-FOUR; j++) {
temp = product2[i][j] * product2[i][j+2];
if(temp > maxproduct)
maxproduct = temp;
}
for(int i=0; i<MAXN; i++)
for(int j=0; j<MAXN-TWO; j++)
product2[j][i] = grid[j][i] * grid[j][i+1];
for(int i=0; i<MAXN; i++)
for(int j=0; j<MAXN-FOUR; j++) {
temp = product2[j][i] * product2[j][i+2];
if(temp > maxproduct)
maxproduct = temp;
}
cout << maxproduct << endl;
return 0;
}
C++:
#include <iostream> using namespace std; const int MAXN = 20; const int FOUR = 4; int grid[MAXN][MAXN]; int main() { int maxproduct = 0, temp; for(int i=0; i<MAXN; i++) for(int j=0; j<MAXN; j++) cin >> grid[i][j]; for(int i=0; i<MAXN-FOUR; i++) for(int j=0; j<MAXN-FOUR; j++) { temp = grid[i][j] * grid[i+1][j+1] * grid[i+2][j+2] * grid[i+3][j+3]; if(temp > maxproduct) maxproduct = temp; temp = grid[i][j+3] * grid[i+1][j+2] * grid[i+2][j+1] * grid[i+3][j]; if(temp > maxproduct) maxproduct = temp; } for(int i=0; i<MAXN; i++) for(int j=0; j<MAXN-FOUR; j++) { temp = grid[i][j] * grid[i][j+1] * grid[i][j+2] * grid[i][j+3]; if(temp > maxproduct) maxproduct = temp; temp = grid[j][i] * grid[j][i+1] * grid[j][i+2] * grid[j][i+3]; if(temp > maxproduct) maxproduct = temp; } cout << maxproduct << endl; return 0; }
Input data:
08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 12 50 77 91 08 49 49 99 40 17 81 18 57 60 87 17 40 98 43 69 48 04 56 62 00 81 49 31 73 55 79 14 29 93 71 40 67 53 88 30 03 49 13 36 65 52 70 95 23 04 60 11 42 69 24 68 56 01 32 56 71 37 02 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 03 45 02 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 02 62 12 20 95 63 94 39 63 08 40 91 66 49 94 21 24 55 58 05 66 73 99 26 97 17 78 78 96 83 14 88 34 89 63 72 21 36 23 09 75 00 76 44 20 45 35 14 00 61 33 97 34 31 33 95 78 17 53 28 22 75 31 67 15 94 03 80 04 62 16 14 09 53 56 92 16 39 05 42 96 35 31 47 55 58 88 24 00 17 54 24 36 29 85 57 86 56 00 48 35 71 89 07 05 44 44 37 44 60 21 58 51 54 17 58 19 80 81 68 05 94 47 69 28 73 92 13 86 52 17 77 04 89 55 40 04 52 08 83 97 35 99 16 07 97 57 32 16 26 26 79 33 27 98 66 88 36 68 87 57 62 20 72 03 46 33 67 46 55 12 32 63 93 53 69 04 42 16 73 38 25 39 11 24 94 72 18 08 46 29 32 40 62 76 36 20 69 36 41 72 30 23 88 34 62 99 69 82 67 59 85 74 04 36 16 20 73 35 29 78 31 90 01 74 31 49 71 48 86 81 16 23 57 05 54 01 70 54 71 83 51 54 69 16 92 33 48 61 43 52 01 89 19 67 48
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