http://www.lydsy.com/JudgeOnline/problem.php?id=2419 ∑Ui−UjRi,j=0∑Ui−UjRi,j=0 ∑U1−UjR1,j=1∑U1−UjR1,j=1 ∑Un−UjRi,n=−1∑Un−UjRi,n=−1 Un=0 这就是方程了...但是代码有点不理解 #include<bits/stdc++.h> using namespace std; ; double a[N][N], g[N][N]; int n, m; void build()…