LOJ6280 数列分块入门4

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LOJ6280 数列分块入门 4

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标签

• 分块入门

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前言

• 我的csdn和博客园是同步的，欢迎来访danzh-博客园~

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简明题意

• 维护序列，支持两种操作：
  1. 区间加
  2. 区间查询

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思路

• 多维护一个tag[]和一个sum[]就可以了~

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注意事项

• 无

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总结

• 无

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AC代码

#include<cstdio>
#include<algorithm>
#include<cmath>
#include<vector>
using namespace std;

const int maxn = 1e5 + 10;

int n, a[maxn];
int pos[maxn], len, tag[maxn], sum[maxn];

void change(int l, int r, int c)
{
	for (int i = l; i <= min(len * pos[l], r); i++)
		a[i] += c, sum[pos[i]] += c;

	if (pos[l] != pos[r])
		for (int i = r; i >= len * pos[r] - len + 1; i--)
			a[i] += c, sum[pos[i]] += c;

	for (int i = pos[l] + 1; i <= pos[r] - 1; i++)
		tag[i] += c;
}

int cal(int l, int r, int c)
{
	long long ans = 0;
	for (int i = l; i <= min(len * pos[l], r); i++)
		ans += 1ll * a[i] + tag[pos[i]], ans %= (c + 1);
	
	if (pos[l] != pos[r])
		for (int i = r; i >= len * pos[r] - len + 1; i--)
			ans += 1ll * a[i] + tag[pos[i]], ans %= (c + 1);

	for (int i = pos[l] + 1; i <= pos[r] - 1; i++)
		ans += sum[i] + 1ll * tag[i] * len, ans %= (c + 1);

	return ans;
}

void solve()
{
	scanf("%d", &n);
	len = sqrt(n);
	for (int i = 1; i <= n; i++)
		scanf("%d", &a[i]), pos[i] = (i - 1) / len + 1, sum[pos[i]] += a[i];

	for (int i = 1; i <= n; i++)
	{
		int opt, l, r, c;
		scanf("%d%d%d%d", &opt, &l, &r, &c);
		if (opt == 0)
			change(l, r, c);
		else
			printf("%d\n", cal(l, r, c));
	}
}

int main()
{
	freopen("Testin.txt", "r", stdin);
	//freopen("Testout.txt", "w", stdout);
	solve();
	return 0;
}