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一、P3919 【模板】可持久化线段树 1(可持久化数组)#include
using namespace std;
const int N = 1e6 + 10;
int root[N], n, m;
int lc[N 1;
if(x > 1;
if(x > n >> m;
build(root[0], 1, n);
for(int i = 1; i > pre >> op >> x;
if(op == 1){
cin >> v;
update(root[i], root[pre], 1, n, x, v);
}
else{
cout > r >> k;
cout
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