【題目敘述】https://zerojudge.tw/ShowProblem?problemid=d481
【解題想法】
- 矩陣 C = A * B，C[i][j] = Sum(A[i][k] * B[k][j]), 0<= k <= b
- Dimensions of 矩陣 A: a x b
- Dimensions of 矩陣 B: b x d
- Dimensions of 矩陣 C: b x d
- (Line-11/22)：要宣告long long
#include <iostream>
using namespace std;
int main() {
int a, b, c, d;
while (cin >> a >> b >> c >> d){
if (b != c){
cout << "Error\n";
continue;
}
long long A[a][b], B[b][d];
for (int i = 0; i < a; i++){
for (int j = 0; j < b; j++){
cin >> A[i][j];
}
}
for (int i = 0; i < c; i++){
for (int j = 0; j < d; j++){
cin >> B[i][j];
}
}
long long C[a][d];
for (int i = 0; i < a; i++){
for (int j = 0; j < d; j++){
C[i][j] = 0;
for (int k = 0; k < c; k++){
C[i][j] += A[i][k] * B[k][j];
}
}
}
for (int i = 0; i < a; i++){
for (int j = 0; j < d; j++){
cout << C[i][j] << " ";
}
cout << "\n";
}
}
return 0;
}