#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define _size(x) (int)x.size()
#define BIT(i, x) ((x >> i) & 1)
#define MASK(n) ((1 << n) - 1)
#define REP(i, n) for (int i = 0, _n = (n); i < _n; i++)
#define FOR(i, a, b) for (int i = a, _b = (b); i <= _b; i++)
#define FORD(i, a, b) for (int i = a, _b = (b); i >= _b; i--)
#define FORB1(i, mask) for (int i = mask; i > 0; i ^= i & - i)
#define FORB0(i, n, mask) for (int i = ((1 << n) - 1) ^ mask; i > 0; i ^= i & - i)
#define FORALL(i, a) for (auto i: a)
#define fastio ios_base::sync_with_stdio(0); cin.tie(0);
struct queryNode {
string type;
int id, a, b;
};
int n, q;
string s;
vector<int> a;
vector<queryNode> qu;
namespace subtask1 {
void main() {
vector<vector<int>> c(q + 1, vector<int>(n + 1));
FOR(i, 1, n) c[0][i] = a[i] + c[0][i - 1];
REP(i, q) {
FOR(j, 1, n) c[i + 1][j] = c[i][j] - c[i][j - 1];
if (i && qu[i - 1].type == "toggle") c[i + 1][qu[i - 1].id] = 1 - c[i + 1][qu[i - 1].id];
FOR(j, 1, n) c[i + 1][j] += c[i + 1][j - 1];
if (qu[i].type == "query") {
int a = qu[i].a, b = qu[i].b - 1;
int ans = 0;
FOR(j, 1, i + 1) ans += (c[j][b] - c[j][a - 1] == b - a + 1);
cout << ans << '\n';
}
}
}
}
bool checkSub2() {
REP(i, q) {
if (qu[i].type == "toggle") continue;
if (qu[i].b - qu[i].a != 1) return false;
}
return true;
}
namespace subtask2 {
void main() {
vector<int> ans(n + 1), in(n + 1, - 1);
FOR(i, 1, n) if (a[i] == 1) in[i] = 1;
REP(i, q) {
if (i && qu[i - 1].type == "toggle") {
int id = qu[i - 1].id;
if (!a[id]) {
a[id] = 1 - a[id];
in[id] = i + 1;
}
else {
a[id] = 0;
ans[id] += (i + 1) - in[id];
in[id] = - 1;
}
}
if (qu[i].type == "query") cout << ans[qu[i].a] + (in[qu[i].a] != - 1 ? i + 1 - in[qu[i].a] + 1 : 0) << '\n';
}
}
}
bool checkSub3() {
vector<int> b(n + 1);
FOR(i, 1, n) b[i] = a[i];
REP(i, q) {
if (qu[i].type == "toggle") {
int id = qu[i].id;
if (b[id]) return false;
b[id] = 1 - b[id];
}
}
return true;
}
namespace subtask3 {
const int inf = 1e9;
struct segTree {
vector<int> ST;
void init(int n) {
ST.resize(4 * n + 4);
}
void update(int id, int l, int r, int pos, int val) {
if (pos < l || r < pos) return ;
if (l == r) {
ST[id] = val;
return ;
}
int mid = (l + r) / 2;
update(id * 2, l, mid, pos, val);
update(id * 2 + 1, mid + 1, r, pos, val);
ST[id] = max(ST[id * 2], ST[id * 2 + 1]);
}
int get(int id, int l, int r, int u, int v) {
if (r < u || v < l) return 0;
if (u <= l && r <= v) return ST[id];
int mid = (l + r) / 2;
return max(get(id * 2, l, mid, u, v), get(id * 2 + 1, mid + 1, r, u, v));
}
} st;
void main() {
st.init(n);
FOR(i, 1, n) {
if (a[i]) st.update(1, 1, n, i, 1);
else st.update(1, 1, n, i, inf);
}
REP(i, q) {
if (qu[i].type == "toggle") {
int id = qu[i].id;
st.update(1, 1, n, id, i + 2);
}
if (qu[i].type == "query") {
int a = qu[i].a, b = qu[i].b - 1;
int value = st.get(1, 1, n, a, b);
if (value == inf) cout << 0 << '\n';
else cout << i + 1 - value + 1 << '\n';
}
}
}
}
bool checkSub4() {
int cnt = 0;
REP(i, q) {
if (qu[i].type == "toggle" && cnt) return false;
cnt += (qu[i].type == "query");
}
return true;
}
namespace subtask4 {
struct fenTree {
int n;
vector<int> bit;
void init(int sz) {
bit.resize(sz + 1);
n = sz;
}
void update(int pos, int val) {
while (pos <= n) {
bit[pos] += val;
pos += pos & - pos;
}
}
int get(int pos) {
int res = 0;
while (pos) {
res += bit[pos];
pos -= pos & - pos;
}
return res;
}
} ft;
void main() {
map<pair<int, int>, int> in;
set<int> st;
int pos = - 1;
FOR(i, 1, n) {
if (!a[i]) {
if (pos != - 1) {
in[{pos, i - 1}] = 1;
pos = - 1;
}
st.insert(i);
}
if (pos == - 1 && a[i]) pos = i;
}
if (pos) in[{pos, n}] = 1;
vector<pair<pair<int, int>, int>> g;
FOR(i, 1, q - 1) {
if (qu[i - 1].type == "toggle") {
int id = qu[i - 1].id;
auto it = st.lower_bound(id);
int l = - 1, r = - 1;
if (it == st.end()) r = n;
else r = *it - 1;
if (it == st.begin()) l = 1;
else {
it--;
l = *it + 1;
}
if (a[id]) {
g.push_back({{l, r}, i - in[{l, r}] + 1});
in.erase({l, r});
if (l <= id - 1) in[{l, id - 1}] = i + 1;
if (id + 1 <= r) in[{id + 1, r}] = i + 1;
st.insert(id);
}
else {
it = st.upper_bound(id);
if (it == st.end()) r = n;
else r = *it - 1;
if (l <= id - 1) {
g.push_back({{l, id - 1}, i - in[{l, id - 1}] + 1});
in.erase({l, id - 1});
}
if (id + 1 <= r) {
g.push_back({{id + 1, r}, i - in[{id + 1, r}] + 1});
in.erase({id + 1, r});
}
in[{l, r}] = i + 1;
st.erase(id);
}
a[id] = 1 - a[id];
}
if (qu[i].type == "query") break;
}
sort(g.begin(), g.end(), [&] (const pair<pair<int, int>, int> a, pair<pair<int, int>, int> b) { return a.fi.fi < b.fi.fi; });
vector<int> ask;
REP(i, q) {
if (qu[i].type == "toggle") continue;
ask.push_back(i);
}
sort(ask.begin(), ask.end(), [&] (const int i, int j) { return qu[i].a < qu[j].a; });
vector<int> ans(q);
ft.init(n);
int i = 0;
FORALL(id, ask) {
while (i < _size(g) && g[i].fi.fi <= qu[id].a) {
ft.update(g[i].fi.se, g[i].se);
i++;
}
ans[id] += ft.get(n) - ft.get(qu[id].b - 2);
}
vector<int> vtx;
FOR(i, 1, n) if (!a[i]) vtx.push_back(i);
int cnt = 0;
REP(i, q) {
if (qu[i].type == "toggle") continue;
if (!_size(vtx)) cout << ans[i] + i + 1 - in[{1, n}] + 1 << '\n';
else {
pos = lower_bound(vtx.begin(), vtx.end(), qu[i].a) - vtx.begin();
if (pos == _size(vtx) || vtx[pos] > qu[i].b - 1) {
int l = (pos > 0 ? vtx[pos - 1] + 1 : 1);
int r = (pos == _size(vtx) ? n : vtx[pos] - 1);
cout << ans[i] + i + 1 - in[{l, r}] + 1 << '\n';
}
else cout << ans[i] << '\n';
}
}
}
}
namespace subtask5 {
struct fenTree {
vector<int> bit;
void reset(int sz) {
n = sz;
bit.clear();
bit.resize(n + 1);
}
void update(int pos, int val) {
while (pos <= n) {
bit[pos] += val;
pos += pos & - pos;
}
}
int get(int pos) {
int res = 0;
while (pos) {
res += bit[pos];
pos -= pos & - pos;
}
return res;
}
} ft;
void main() {
/***
chia thanh sqrt(q) block
duyet trong block
neu la "toggle" thi update nhu bthg
con khong duyet lai cac doan moi them
*/
map<pair<int, int>, int> in;
vector<pair<pair<int, int>, int>> g;
set<int> st;
int pos = - 1;
FOR(i, 1, n) {
if (!a[i]) {
if (pos != - 1) {
in[{pos, i - 1}] = 1;
pos = - 1;
}
st.insert(i);
}
if (pos == - 1 && a[i]) pos = i;
}
if (pos) in[{pos, n}] = 1;
int blockSz = 1000;
int cnt = q / blockSz + (q % blockSz ? 1 : 0);
vector<int> ans(q);
REP(t, cnt) {
int l = t * blockSz, r = min(q - 1, (t + 1) * blockSz - 1);
vector<int> ask;
FOR(i, l, r) if (qu[i].type == "query") ask.push_back(i);
sort(ask.begin(), ask.end(), [&] (const int i, int j) { return qu[i].a < qu[j].a; });
sort(g.begin(), g.end(), [&] (const pair<pair<int, int>, int> a, pair<pair<int, int>, int> b) { return a.fi.fi < b.fi.fi; });
ft.reset(n);
int j = 0;
FORALL(id, ask) {
while (j < _size(g) && g[j].fi.fi <= qu[id].a) {
ft.update(n - g[j].fi.se + 1, g[j].se);
j++;
}
vector<int> sav_vtx;
vector<pair<pair<int, int>, int>> sav_in, _g;
FOR(i, l, id) {
if (qu[i].type == "query") continue;
int _id = qu[i].id;
auto it = st.lower_bound(_id);
int l = - 1, r = - 1;
if (it == st.end()) r = n;
else r = *it - 1;
if (it == st.begin()) l = 1;
else {
it--;
l = *it + 1;
}
if (a[_id]) {
_g.push_back({{l, r}, i + 1 - in[{l, r}] + 1});
sav_in.push_back({{l, r}, - in[{l, r}]});
in.erase({l, r});
if (l <= _id - 1) {
in[{l, _id - 1}] = i + 2;
sav_in.push_back({{l, _id - 1}, i + 1});
}
if (_id + 1 <= r) {
in[{_id + 1, r}] = i + 2;
sav_in.push_back({{_id + 1, r}, i + 1});
}
st.insert(_id);
sav_vtx.push_back(_id);
}
else {
it = st.upper_bound(_id);
if (it == st.end()) r = n;
else r = *it - 1;
if (l <= _id - 1) {
_g.push_back({{l, _id - 1}, i + 1 - in[{l, _id - 1}] + 1});
sav_in.push_back({{l, _id - 1}, - in[{l, _id - 1}]});
in.erase({l, _id - 1});
}
if (id + 1 <= r) {
_g.push_back({{_id + 1, r}, i + 1 - in[{_id + 1, r}] + 1});
sav_in.push_back({{_id + 1, r}, - in[{_id + 1, r}]});
in.erase({_id + 1, r});
}
in[{l, r}] = i + 2;
sav_in.push_back({{l, r}, i + 2});
st.erase(_id);
sav_vtx.push_back(- _id);
}
a[_id] = 1 - a[_id];
}
int res = ft.get(n - (qu[id].b - 1) + 1);
FORALL(e, _g) if (e.fi.fi <= qu[id].a && e.fi.se >= qu[id].b - 1) res += e.se;
auto it = st.lower_bound(qu[id].a);
if (it == st.end() || *it > qu[id].b - 1) {
int pos = - 1;
if (it == st.begin()) pos = 1;
else {
it--;
pos = *it + 1;
it++;
}
res += id + 1 - in[{pos, *it - 1}] + 1;
}
ans[id] = res;
FORD(i, _size(sav_in) - 1, 0) {
if (sav_in[i].se > 0) in.erase(sav_in[i].fi);
else in[sav_in[i].fi] = - sav_in[i].se;
}
FORD(i, _size(sav_vtx) - 1, 0) {
int pos = sav_vtx[i];
a[pos] = 1 - a[pos];
if (pos < 0) st.insert(- pos);
else st.erase(pos);
}
}
FOR(i, l, r) {
if (qu[i].type == "query") continue;
int id = qu[i].id;
auto it = st.lower_bound(id);
int l = - 1, r = - 1;
if (it == st.end()) r = n;
else r = *it - 1;
if (it == st.begin()) l = 1;
else {
it--;
l = *it + 1;
}
if (a[id]) {
g.push_back({{l, r}, i + 1 - in[{l, r}] + 1});
in.erase({l, r});
if (l <= id - 1) in[{l, id - 1}] = i + 2;
if (id + 1 <= r) in[{id + 1, r}] = i + 2;
st.insert(id);
}
else {
it = st.upper_bound(id);
if (it == st.end()) r = n;
else r = *it - 1;
if (l <= id - 1) {
g.push_back({{l, id - 1}, i + 1 - in[{l, id - 1}] + 1});
in.erase({l, id - 1});
}
if (id + 1 <= r) {
g.push_back({{id + 1, r}, i + 1 - in[{id + 1, r}] + 1});
in.erase({id + 1, r});
}
in[{l, r}] = i + 2;
st.erase(id);
}
a[id] = 1 - a[id];
}
}
REP(i, q) if (qu[i].type == "query") cout << ans[i] << '\n';
}
}
int main() {
fastio;
cin >> n >> q;
cin >> s;
a.resize(n + 1);
FOR(i, 1, n) a[i] = s[i - 1] - '0';
qu.resize(q);
REP(i, q) {
cin >> qu[i].type;
if (qu[i].type == "toggle") cin >> qu[i].id;
else cin >> qu[i].a >> qu[i].b;
}
if (n <= 100 && q <= 100) subtask1::main();
else if (checkSub2()) subtask2::main();
else if (checkSub3()) subtask3::main();
else if (checkSub4()) subtask4::main();
else subtask5::main();
return 0;
}
Compilation message
street_lamps.cpp: In function 'void subtask4::main()':
street_lamps.cpp:268:13: warning: unused variable 'cnt' [-Wunused-variable]
268 | int cnt = 0;
| ^~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
344 KB |
Output is correct |
| 2 |
Correct |
1 ms |
348 KB |
Output is correct |
| 3 |
Correct |
0 ms |
348 KB |
Output is correct |
| 4 |
Correct |
0 ms |
348 KB |
Output is correct |
| 5 |
Correct |
0 ms |
348 KB |
Output is correct |
| 6 |
Correct |
0 ms |
348 KB |
Output is correct |
| 7 |
Correct |
0 ms |
348 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
68 ms |
15444 KB |
Output is correct |
| 2 |
Correct |
67 ms |
15440 KB |
Output is correct |
| 3 |
Correct |
81 ms |
15328 KB |
Output is correct |
| 4 |
Correct |
81 ms |
18960 KB |
Output is correct |
| 5 |
Correct |
80 ms |
19472 KB |
Output is correct |
| 6 |
Correct |
71 ms |
18920 KB |
Output is correct |
| 7 |
Correct |
88 ms |
18948 KB |
Output is correct |
| 8 |
Correct |
87 ms |
20440 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
348 KB |
Output is correct |
| 2 |
Correct |
1 ms |
348 KB |
Output is correct |
| 3 |
Correct |
1 ms |
348 KB |
Output is correct |
| 4 |
Correct |
1 ms |
344 KB |
Output is correct |
| 5 |
Correct |
136 ms |
20588 KB |
Output is correct |
| 6 |
Correct |
168 ms |
21000 KB |
Output is correct |
| 7 |
Correct |
180 ms |
21072 KB |
Output is correct |
| 8 |
Correct |
202 ms |
22792 KB |
Output is correct |
| 9 |
Correct |
72 ms |
12616 KB |
Output is correct |
| 10 |
Correct |
82 ms |
13780 KB |
Output is correct |
| 11 |
Correct |
84 ms |
13652 KB |
Output is correct |
| 12 |
Correct |
210 ms |
21396 KB |
Output is correct |
| 13 |
Correct |
201 ms |
22608 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
348 KB |
Output is correct |
| 2 |
Correct |
1 ms |
348 KB |
Output is correct |
| 3 |
Correct |
1 ms |
348 KB |
Output is correct |
| 4 |
Correct |
1 ms |
344 KB |
Output is correct |
| 5 |
Correct |
213 ms |
33408 KB |
Output is correct |
| 6 |
Correct |
299 ms |
33920 KB |
Output is correct |
| 7 |
Correct |
331 ms |
35188 KB |
Output is correct |
| 8 |
Correct |
424 ms |
36144 KB |
Output is correct |
| 9 |
Correct |
157 ms |
19244 KB |
Output is correct |
| 10 |
Correct |
147 ms |
22344 KB |
Output is correct |
| 11 |
Correct |
157 ms |
19136 KB |
Output is correct |
| 12 |
Correct |
158 ms |
21272 KB |
Output is correct |
| 13 |
Correct |
156 ms |
19276 KB |
Output is correct |
| 14 |
Correct |
149 ms |
21172 KB |
Output is correct |
| 15 |
Correct |
205 ms |
21356 KB |
Output is correct |
| 16 |
Correct |
202 ms |
22612 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
344 KB |
Output is correct |
| 2 |
Correct |
1 ms |
348 KB |
Output is correct |
| 3 |
Correct |
0 ms |
348 KB |
Output is correct |
| 4 |
Correct |
0 ms |
348 KB |
Output is correct |
| 5 |
Correct |
0 ms |
348 KB |
Output is correct |
| 6 |
Correct |
0 ms |
348 KB |
Output is correct |
| 7 |
Correct |
0 ms |
348 KB |
Output is correct |
| 8 |
Correct |
68 ms |
15444 KB |
Output is correct |
| 9 |
Correct |
67 ms |
15440 KB |
Output is correct |
| 10 |
Correct |
81 ms |
15328 KB |
Output is correct |
| 11 |
Correct |
81 ms |
18960 KB |
Output is correct |
| 12 |
Correct |
80 ms |
19472 KB |
Output is correct |
| 13 |
Correct |
71 ms |
18920 KB |
Output is correct |
| 14 |
Correct |
88 ms |
18948 KB |
Output is correct |
| 15 |
Correct |
87 ms |
20440 KB |
Output is correct |
| 16 |
Correct |
1 ms |
348 KB |
Output is correct |
| 17 |
Correct |
1 ms |
348 KB |
Output is correct |
| 18 |
Correct |
1 ms |
348 KB |
Output is correct |
| 19 |
Correct |
1 ms |
344 KB |
Output is correct |
| 20 |
Correct |
136 ms |
20588 KB |
Output is correct |
| 21 |
Correct |
168 ms |
21000 KB |
Output is correct |
| 22 |
Correct |
180 ms |
21072 KB |
Output is correct |
| 23 |
Correct |
202 ms |
22792 KB |
Output is correct |
| 24 |
Correct |
72 ms |
12616 KB |
Output is correct |
| 25 |
Correct |
82 ms |
13780 KB |
Output is correct |
| 26 |
Correct |
84 ms |
13652 KB |
Output is correct |
| 27 |
Correct |
210 ms |
21396 KB |
Output is correct |
| 28 |
Correct |
201 ms |
22608 KB |
Output is correct |
| 29 |
Correct |
1 ms |
348 KB |
Output is correct |
| 30 |
Correct |
1 ms |
348 KB |
Output is correct |
| 31 |
Correct |
1 ms |
348 KB |
Output is correct |
| 32 |
Correct |
1 ms |
344 KB |
Output is correct |
| 33 |
Correct |
213 ms |
33408 KB |
Output is correct |
| 34 |
Correct |
299 ms |
33920 KB |
Output is correct |
| 35 |
Correct |
331 ms |
35188 KB |
Output is correct |
| 36 |
Correct |
424 ms |
36144 KB |
Output is correct |
| 37 |
Correct |
157 ms |
19244 KB |
Output is correct |
| 38 |
Correct |
147 ms |
22344 KB |
Output is correct |
| 39 |
Correct |
157 ms |
19136 KB |
Output is correct |
| 40 |
Correct |
158 ms |
21272 KB |
Output is correct |
| 41 |
Correct |
156 ms |
19276 KB |
Output is correct |
| 42 |
Correct |
149 ms |
21172 KB |
Output is correct |
| 43 |
Correct |
205 ms |
21356 KB |
Output is correct |
| 44 |
Correct |
202 ms |
22612 KB |
Output is correct |
| 45 |
Execution timed out |
5007 ms |
11708 KB |
Time limit exceeded |
| 46 |
Halted |
0 ms |
0 KB |
- |
