diff options
Diffstat (limited to 'math/lgsFp.cpp')
| -rw-r--r-- | math/lgsFp.cpp | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/math/lgsFp.cpp b/math/lgsFp.cpp index 14549b7..52442c6 100644 --- a/math/lgsFp.cpp +++ b/math/lgsFp.cpp @@ -1,10 +1,5 @@ -// Laufzeit: O(n^3) -void swapLines(int n, int l1, int l2) { - for (int i = 0; i <= n; i++) swap(mat[l1][i], mat[l2][i]); -} - void normalLine(int n, int line, ll p) { - ll factor = multInv(mat[line][line], p); // Implementierung von oben. + ll factor = multInv(mat[line][line], p); for (int i = 0; i <= n; i++) { mat[line][i] *= factor; mat[line][i] %= p; @@ -23,8 +18,10 @@ void takeAll(int n, int line, ll p) { void gauss(int n, ll p) { // nx(n+1)-Matrix, Körper F_p. for (int line = 0; line < n; line++) { int swappee = line; - while (mat[swappee][line] == 0) swappee++; - swapLines(n, line, swappee); + while (swappee < n && mat[swappee][line] == 0) swappee++; + if (swappee == n) continue; + swap(mat[line], mat[swappee]); normalLine(n, line, p); takeAll(n, line, p); + // für Eindeutigkeit, Existenz etc. siehe LGS }} |