Fix blatant error in C++ code

1 files changed, 1 insertions, 1 deletions

diff --git a/aberth/aberth.cpp b/aberth/aberth.cpp
index c5b037d..42e3106 100644
--- a/aberth/aberth.cpp
+++ b/aberth/aberth.cpp
@@ -158,7 +158,7 @@ struct AberthState {
 			Com derivval = eval(deriv, poly.size() - 1, approx[i]);
 			Com quo = pval / derivval;
 			Com sum = 0;
-			for (int j = 0; j < i; j++) sum += pairs[N * j + i];
+			for (int j = 0; j < i; j++) sum -= pairs[N * j + i];
 			for (int j = i + 1; j < N; j++) sum += pairs[N * i + j];
 			offsets[i] = quo / (1.0 - quo * sum);