プロジェクト オイラー #11 を解決しようとしていますが、出力している 2 つの最大の製品で負の数が得られます。私の知恵の終わりのようなもので、長い長いデータ型を使用することで安全だと考えましたが、何が起こっているのかわかりません。他に何を試せばいいのかわからない、おそらく非常にばかげたことをしているのだろうが、砂の中で車輪を数時間回転させてきたので、手を差し伸べる時が来たと思う
#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
long long hZ (int matrix[20][20], int i, int j);
int main()
{
fstream inFile;
int matrix [20][20];
long long max = 0;
inFile.open("numbers.txt");
if(!inFile)
cout << "numbers.txt failed to open!" << endl;
for(int i = 0; i < 20; i++)
for(int j = 0; j < 20; j++)
inFile >> matrix[i][j];
for(int i = 0; i < 20; i++)
{
for(int j = 0; j < 16; j++)
{
long long temp = hZ(matrix, i, j);
if (temp > max)
max = temp;
cout << matrix[i][j] << " " << matrix[i][j+1] << " " << matrix[i][j+2] << " " << matrix[i][j+3] << " " << matrix[i][j+4];
//cout.setf(ios::fixed);
cout << " product: " << temp << " max: " << max << endl;
}
cout << endl;
}
cout << "The max is: " << max;
return 0;
}
long long hZ (int matrix[20][20], int i , int j)
{
long long hZ_product = 0;
hZ_product = (matrix[i][j] * matrix[i][j+1] * matrix[i][j+2] * matrix[i][j+3] * matrix[i][j+4]);
return hZ_product;
}
出力: (出力をほぼ最後までスクロールすると、問題の原因となっている行についてコメントした場所が表示されます):
8 2 22 97 38 product: 1297472 max: 1297472
2 22 97 38 15 product: 2432760 max: 2432760
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97 38 15 0 40 product: 0 max: 2432760
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62 99 69 82 67 product: -1968137428 max: 1417023468 //ISSUE HERE
99 69 82 67 59 product: -2080725970 max: 1417023468 //ISSUE HERE
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The max is: 2038878340