Function test1

test/test_gauss.cpp:11–18

typedef vector<dbl> vec;

void test1(){
    //x + y = 0
    matrix A = {{1, 1}};
    vec b = {0};
    vec ans(2);
    A[0].push_back(b[0]);
    assert(gauss(A, ans) == INF);
}

void test2(){
    //x + y = 0