【Codeforces 707D】Persistent Bookcase



using namespace std;

int n,m,q;

namespace Chair_Tree{
	#define CT Chair_Tree
	const int MAXN = 2000000;
	const int N = 1000+9;
	const int Q = 100000+9;
	int ls[MAXN],rs[MAXN],sum[MAXN],TY,ans_tmp,cnt,tmp_root,pr[N],pv[N],vout[Q];
	int root[Q][N]; bool rev[Q][N];
	inline void Clone(int p, int w) {
		vout[w] = vout[p];
	void modify(int p, int &w, int l, int r, int pos){
		w = ++cnt; ls[w] = ls[p]; rs[w] = rs[p]; sum[w] = sum[p];
		if (l < r) {
			int mid = l + r + 1 >> 1;
			if (pos < mid) modify(ls[p],ls[w],l,mid-1,pos);
			else modify(rs[p],rs[w],mid,r,pos);
			sum[w] = sum[ls[w]] + sum[rs[w]];
		} else if (sum[w] + TY == 1) sum[w] ^= 1, ans_tmp = 1;
	inline int modify(int i, int j, int ty, int k){
		Clone(k-1,k); ans_tmp = 0; TY = ty^rev[k][i]; 
		modify(root[k][i],tmp_root,1,m,j); root[k][i] = tmp_root;
		if (ty == 1) vout[k] += ans_tmp;
		else vout[k] -= ans_tmp;
		return vout[k];
	inline int REV(int i,int k){
		Clone(k-1,k); rev[k][i] ^= 1;
		int tmp = sum[root[k-1][i]], w=tmp;
		if (rev[k-1][i]) tmp = m - tmp;
		else w = m - w; vout[k] += w - tmp;
		return vout[k];

inline int read(){
	char c=getchar(); int ret=0;
	while (c<'0'||c>'9') c=getchar();
	while (c<='9'&c>='0') ret=ret*10+c-'0',c=getchar();
	return ret;

int main(){
	for (int i=1,ty,x,y;i<=q;i++) {
		ty = read();
		if (ty == 1) {
			x = read(); y = read();
		} else if (ty == 2) {
			x = read(); y = read();
		} else if (ty == 3) printf("%d\n",CT::REV(read(),i));
		else CT::Clone(read(),i), printf("%d\n",CT::vout[i]);
	return 0;


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