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https://git.sb/baoshuo/OI-codes.git
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90 lines
1.8 KiB
C++
90 lines
1.8 KiB
C++
#include <bits/stdc++.h>
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using namespace std;
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struct node {
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int l, r;
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int s, d;
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node() {
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l = r = s = d = 0;
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}
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node(int _l, int _r) {
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l = _l;
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r = _r;
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s = d = 0;
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}
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} tr[200005 << 2];
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int n, m, op, x, y, a[200005];
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void pushup(int u) {
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tr[u].s = tr[u << 1].s + tr[u << 1 | 1].s;
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}
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void pushdown(int u) {
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if (tr[u].d) {
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tr[u << 1].d ^= tr[u].d;
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tr[u << 1].s = (tr[u << 1].r - tr[u << 1].l + 1) - tr[u << 1].s;
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tr[u << 1 | 1].d ^= tr[u].d;
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tr[u << 1 | 1].s = (tr[u << 1 | 1].r - tr[u << 1 | 1].l + 1) - tr[u << 1 | 1].s;
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tr[u].d = 0;
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}
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}
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void build(int u, int l, int r) {
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tr[u] = node(l, r);
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if (l == r) {
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tr[u].s = a[l];
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return;
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}
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int mid = l + r >> 1;
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build(u << 1, l, mid);
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build(u << 1 | 1, mid + 1, r);
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pushup(u);
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}
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void modify(int u, int l, int r) {
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if (tr[u].l >= l && tr[u].r <= r) {
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tr[u].d ^= 1;
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tr[u].s = (tr[u].r - tr[u].l + 1) - tr[u].s;
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return;
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}
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int mid = tr[u].l + tr[u].r >> 1;
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pushdown(u);
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if (l <= mid) {
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modify(u << 1, l, r);
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}
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if (r > mid) {
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modify(u << 1 | 1, l, r);
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}
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pushup(u);
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}
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int query(int u, int l, int r) {
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if (tr[u].l >= l && tr[u].r <= r) {
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return tr[u].s;
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}
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int mid = tr[u].l + tr[u].r >> 1;
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int s = 0;
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pushdown(u);
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if (l <= mid) s += query(u << 1, l, r);
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if (r > mid) s += query(u << 1 | 1, l, r);
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return s;
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}
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int main() {
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cin >> n >> m;
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for (int i = 1; i <= n; i++) {
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scanf("%1d", &a[i]);
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}
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build(1, 1, n);
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while (m--) {
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cin >> op >> x >> y;
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if (op == 0) {
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modify(1, x, y);
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} else if (op == 1) {
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cout << query(1, x, y) << endl;
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}
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}
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return 0;
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}
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