回答編集履歴
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追記
test
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@@ -19,3 +19,31 @@
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}
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```
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あるいは
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```C++
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#include <iostream>
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#include <vector>
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int main() {
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using namespace std;
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vector<vector<double>> A;
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A.assign({{3,-1,-1},{-1,3,-1},{-1,-1,3}});
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vector<double> b;
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b.assign({1,1,1});
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...
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}
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```
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