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  • 2020.1.5考试总结

    T1和T3不太可做..先只放一下T2
    TMD考场上没算好空间直接MLE爆零...
    操作1可以归到操作3里,并且几个人的操作可以合并到一块,用线段树挺好维护的。
    对于询问的话可以对每一个节点开一个桶,记录区间内前缀数量,向上合并的时候左儿子直接加,右儿子异或后再加。
    发现很多节点根本用不到,动态开点即可。

    #include<iostream>
    #include<cstring>
    #include<cstdio>
    #define lson (k<<1)
    #define rson ((k<<1)|1)
    using namespace std;
    int n, m, r, q, opt, x, y, v, ans, To, tot;
    const int N = 130005;
    int sum[N << 2][1 << 6], lz[N << 2];
    inline int read() 
    {
    	int res = 0; char ch = getchar(); bool XX = false;
    	for (; !isdigit(ch); ch = getchar())(ch == '-') && (XX = true);
    	for (; isdigit(ch); ch = getchar())res = (res << 3) + (res << 1) + (ch ^ 48);
    	return XX ? -res : res;
    }
    struct ju 
    {
    	int c[3][4];
    	friend ju operator ^(const ju &a, const ju &b) 
    	{
    		ju c;
    		memset(c.c, 0, sizeof(c.c));
    		for (int i = 1; i <= n; ++i)
    			for (int j = 1; j <= m; ++j)
    				c.c[i][j] = a.c[i][j] ^ b.c[i][j];
    		return c;
    	}
    } to, tmp, tr[N << 2];
    inline void fu(ju &x, int v) 
    {
    	memset(x.c, 0, sizeof(x.c));
    	if (v <= n)
    		for (int i = 1; i <= m; ++i)x.c[v][i] = 1;
    	else 
    	{
    		v -= n;
    		for (int i = 1; i <= n; ++i)x.c[i][v] = 1;
    	}
    }
    inline int to1(ju x) 
    {
    	int res = 0;
    	for (int i = 1; i <= n; ++i)
    		for (int j = 1; j <= m; ++j)
    			res = (res << 1) | x.c[i][j];
    	return res;
    }
    inline ju to2(int x) 
    {
    	ju res;
    	memset(res.c, 0, sizeof(res.c));
    	for (int i = n; i >= 1; --i)
    		for (int j = m; j >= 1; --j)
    			res.c[i][j] = (x & 1), x >>= 1;
    	return res;
    }
    inline void upd(int k) 
    {
    	int tmp;
    	tr[k] = tr[lson] ^ tr[rson];
    	for (int i = 0; i < tot; ++i)sum[k][i] = sum[lson][i];
    	tmp = to1(tr[lson]);
    	for (int i = 0; i < tot; ++i)sum[k][i ^ tmp] += sum[rson][i];
    }
    void build(int k, int l, int r) 
    {
    	lz[k] = -1;
    	if (l == r) 
    	{
    		fu(tr[k], 1); sum[k][to1(tr[k])] = 1;
    		return;
    	}
    	int mid = (l + r) >> 1;
    	build(lson, l, mid); build(rson, mid + 1, r);
    	upd(k);
    }
    inline void work(int k, int l, int r, int v) 
    {
    	tr[k] = to2((r - l + 1) & 1 ? v : 0);
    	lz[k] = v;
    	for (int i = 0; i < tot; ++i)sum[k][i] = 0;
    	sum[k][v] = (r - l + 2) >> 1; sum[k][0] = (r - l + 1) - sum[k][v];
    }
    inline void cd(int k, int l, int r) 
    {
    	int mid = (l + r) >> 1;
    	work(lson, l, mid, lz[k]); work(rson, mid + 1, r, lz[k]);
    	lz[k] = -1;
    }
    void change(int k, int l, int r, int x, int y, int v) 
    {
    	if (x <= l && r <= y) 
    	{
    		work(k, l, r, v);
    		return;
    	}
    	if (lz[k] != -1)cd(k, l, r);
    	int mid = (l + r) >> 1;
    	if (x <= mid)change(lson, l, mid, x, y, v);
    	if (mid + 1 <= y)change(rson, mid + 1, r, x, y, v);
    	upd(k);
    }
    int ask2(int k, int l, int r, int x, int y, int val) 
    {
    	if (x <= l && r <= y)return sum[k][val];
    	if (lz[k] != -1)cd(k, l, r);
    	int res = 0, mid = (l + r) >> 1;
    	if (x <= mid)res += ask2(lson, l, mid, x, y, val);
    	if (mid + 1 <= y)res += ask2(rson, mid + 1, r, x, y, val ^ to1(tr[lson]));
    	return res;
    }
    void solve2() 
    {
    	ju tmp;
    	build(1, 1, r);
    	while (q--) 
    	{
    		opt = read();
    		if (opt == 0) 
    		{
    			x = read(); y = read();
    			fu(tmp, y);
    			change(1, 1, r, x, x, to1(tmp));
    		}
    		if (opt == 1) 
    		{
    			x = read(); y = read();
    			printf("%d
    ", ask2(1, 1, r, x, y, To));
    		}
    		if (opt == 2) 
    		{
    			x = read(); y = read(); v = read();
    			fu(tmp, v);
    			change(1, 1, r, x, y, to1(tmp));
    		}
    	}
    }
    int main() 
    {
    	cin >> n >> m; tot = (1 << (n * m));
    	for (int i = 1; i <= n; ++i)
    		for (int j = 1; j <= m; ++j)
    			to.c[i][j] = read();
    	To = to1(to);
    	cin >> r >> q;
    	solve2();
    	fclose(stdin); fclose(stdout);
    	return 0;
    }
    
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  • 原文地址:https://www.cnblogs.com/wljss/p/12153776.html
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