#include <bits/stdc++.h>
using namespace std;
typedef tuple<int, int, int> Que;
const int N = 1e6 + 10,
INF = 1e9;
int n, q;
string s;
Que query[N];
struct BIT2D{
vector<int> node[N], bit[N];
void fake_upd(int x, int y){
for(int i = x; i <= n; i += i & -i)
for(int j = y; j <= n; j += j & -j)
node[i].push_back(j);
}
void fake_update(int x, int y, int u, int v){
fake_upd(x, y);
fake_upd(x, v + 1);
fake_upd(u + 1, y);
fake_upd(u + 1, v + 1);
}
void fake_get(int x, int y){
for(int i = x; i > 0; i -= i & -i)
for(int j = y; j > 0; j -= j & -j)
node[i].push_back(j);
}
void build(){
for(int i = 1; i <= n; i++) if(node[i].size()){
sort(node[i].begin(), node[i].end());
node[i].erase(unique(node[i].begin(), node[i].end()), node[i].end());
bit[i].assign(node[i].size() + 1, 0);
}
}
void upd(int x, int y, int val){
for(int i = x; i <= n; i += i & -i)
for(int j = lower_bound(node[i].begin(), node[i].end(), y) - node[i].begin() + 1; j <= node[i].size(); j += j & -j)
bit[i][j - 1] += val;
}
void update(int x, int y, int u, int v, int val){
upd(x, y, val);
upd(x, v + 1, -val);
upd(u + 1, y, -val);
upd(u + 1, v + 1, val);
}
int get(int x, int y){
int res = 0;
for(int i = x; i > 0; i -= i & -i)
for(int j = lower_bound(node[i].begin(), node[i].end(), y) - node[i].begin() + 1; j > 0; j -= j & -j)
res += bit[i][j - 1];
return res;
}
} bit;
struct SegTree{
int st[N << 2], lz[N << 2];
void build(int tl, int tr, int i){
lz[i] = -1;
if(tl == tr){
st[i] = (s[tl] == '1' ? 0 : INF);
return;
}
int tm = tl + tr >> 1;
build(tl, tm, i<<1);
build(tm + 1, tr, i<<1|1);
st[i] = max(st[i<<1], st[i<<1|1]);
}
void push(int i){
if(lz[i] == -1) return;
st[i<<1] = st[i<<1|1] = lz[i<<1] = lz[i<<1|1] = lz[i];
lz[i] = -1;
}
void update(int l, int r, int val, int tl, int tr, int i){
if(r < tl || tr < l || l > r) return;
if(l <= tl && tr <= r){
st[i] = val;
lz[i] = val;
return;
}
if(tl != tr) push(i);
int tm = tl + tr >> 1;
update(l, r, val, tl, tm, i<<1);
update(l, r, val, tm + 1, tr, i<<1|1);
st[i] = max(st[i<<1], st[i<<1|1]);
}
int get(int l, int r, int tl, int tr, int i){
if(r < tl || tr < l || l > r) return 0;
if(l <= tl && tr <= r) return st[i];
if(tl != tr) push(i);
int tm = tl + tr >> 1;
return max(get(l, r, tl, tm, i<<1), get(l, r, tm + 1, tr, i<<1|1));
}
} it;
void init(){
set<int> pos0;
for(int i = 1; i <= n; i++) if(s[i] == '0') pos0.insert(i);
pos0.insert(0); pos0.insert(n + 1);
string tmp = s;
for(int t = 1; t <= q; t++){
auto [ty, x, y] = query[t];
if(ty == 0){
if(s[x] == '0'){
auto i = pos0.find(x);
int l = *prev(i) + 1, r = *next(i) - 1;
s[x] = '1';
if(l <= *i - 1) bit.fake_update(l, l, *i - 1, *i - 1);
if(*i + 1 <= r) bit.fake_update(*i + 1, *i + 1, r, r);
pos0.erase(x);
}else{
s[x] = '0';
pos0.insert(x);
auto i = pos0.find(x);
int l = *prev(i) + 1, r = *next(i) - 1;
bit.fake_update(l, l, r, r);
}
}else{
bit.fake_get(x, y);
}
}
bit.build();
s = tmp;
}
void solve(){
set<int> pos0;
for(int i = 1; i <= n; i++) if(s[i] == '0') pos0.insert(i);
pos0.insert(0); pos0.insert(n + 1);
it.build(1, n, 1);
for(int t = 1; t <= q; t++){
auto [ty, x, y] = query[t];
if(ty == 0){
if(s[x] == '0'){
auto i = pos0.find(x);
int l = *prev(i) + 1, r = *next(i) - 1;
s[x] = '1';
if(l <= *i - 1) bit.update(l, l, *i - 1, *i - 1, t - it.get(l, *i - 1, 1, n, 1));
if(*i + 1 <= r) bit.update(*i + 1, *i + 1, r, r, t - it.get(*i + 1, r, 1, n, 1));
it.update(l, r, t, 1, n, 1);
pos0.erase(x);
}else{
s[x] = '0';
pos0.insert(x);
auto i = pos0.find(x);
int l = *prev(i) + 1, r = *next(i) - 1;
bit.update(l, l, r, r, t - it.get(l, r, 1, n, 1));
it.update(l, r, t, 1, n, 1);
it.update(*i, *i, INF, 1, n, 1);
}
}else{
auto tmp = t - it.get(x, y, 1, n, 1);
cout << bit.get(x, y) + (tmp >= 0 ? tmp : 0) << "\n";
}
}
}
int32_t main(){
cin.tie(0)->sync_with_stdio(0);
#define task "test"
if(fopen(task ".inp", "r")){
freopen(task ".inp", "r", stdin);
freopen(task ".out", "w", stdout);
}
cin >> n >> q >> s;
s = " " + s;
for(int i = 1; i <= q; i++){
string ty; cin >> ty;
if(ty == "toggle"){
int x; cin >> x;
query[i] = Que(0, x, -1);
}else{
int x, y; cin >> x >> y;
query[i] = Que(1, x, y - 1);
}
}
init();
solve();
return 0;
}
Compilation message
street_lamps.cpp: In member function 'void BIT2D::upd(int, int, int)':
street_lamps.cpp:44:91: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
44 | for(int j = lower_bound(node[i].begin(), node[i].end(), y) - node[i].begin() + 1; j <= node[i].size(); j += j & -j)
| ~~^~~~~~~~~~~~~~~~~
street_lamps.cpp: In member function 'void SegTree::build(int, int, int)':
street_lamps.cpp:72:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
72 | int tm = tl + tr >> 1;
| ~~~^~~~
street_lamps.cpp: In member function 'void SegTree::update(int, int, int, int, int, int)':
street_lamps.cpp:91:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
91 | int tm = tl + tr >> 1;
| ~~~^~~~
street_lamps.cpp: In member function 'int SegTree::get(int, int, int, int, int)':
street_lamps.cpp:101:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
101 | int tm = tl + tr >> 1;
| ~~~^~~~
street_lamps.cpp: In function 'int32_t main()':
street_lamps.cpp:188:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
188 | freopen(task ".inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
street_lamps.cpp:189:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
189 | freopen(task ".out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
51536 KB |
Output is correct |
| 2 |
Correct |
9 ms |
51552 KB |
Output is correct |
| 3 |
Correct |
8 ms |
51536 KB |
Output is correct |
| 4 |
Correct |
11 ms |
51792 KB |
Output is correct |
| 5 |
Correct |
8 ms |
51792 KB |
Output is correct |
| 6 |
Correct |
9 ms |
51704 KB |
Output is correct |
| 7 |
Correct |
9 ms |
51536 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
492 ms |
109580 KB |
Output is correct |
| 2 |
Correct |
774 ms |
135944 KB |
Output is correct |
| 3 |
Correct |
1556 ms |
232728 KB |
Output is correct |
| 4 |
Correct |
4002 ms |
455156 KB |
Output is correct |
| 5 |
Runtime error |
918 ms |
524288 KB |
Execution killed with signal 9 |
| 6 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
14 ms |
52304 KB |
Output is correct |
| 2 |
Correct |
14 ms |
52304 KB |
Output is correct |
| 3 |
Correct |
13 ms |
52304 KB |
Output is correct |
| 4 |
Correct |
13 ms |
51808 KB |
Output is correct |
| 5 |
Runtime error |
998 ms |
524288 KB |
Execution killed with signal 9 |
| 6 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
10 ms |
51792 KB |
Output is correct |
| 2 |
Correct |
11 ms |
52048 KB |
Output is correct |
| 3 |
Correct |
12 ms |
52304 KB |
Output is correct |
| 4 |
Correct |
14 ms |
52460 KB |
Output is correct |
| 5 |
Correct |
1785 ms |
253128 KB |
Output is correct |
| 6 |
Correct |
3099 ms |
389204 KB |
Output is correct |
| 7 |
Correct |
4396 ms |
517028 KB |
Output is correct |
| 8 |
Runtime error |
916 ms |
524288 KB |
Execution killed with signal 9 |
| 9 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
51536 KB |
Output is correct |
| 2 |
Correct |
9 ms |
51552 KB |
Output is correct |
| 3 |
Correct |
8 ms |
51536 KB |
Output is correct |
| 4 |
Correct |
11 ms |
51792 KB |
Output is correct |
| 5 |
Correct |
8 ms |
51792 KB |
Output is correct |
| 6 |
Correct |
9 ms |
51704 KB |
Output is correct |
| 7 |
Correct |
9 ms |
51536 KB |
Output is correct |
| 8 |
Correct |
492 ms |
109580 KB |
Output is correct |
| 9 |
Correct |
774 ms |
135944 KB |
Output is correct |
| 10 |
Correct |
1556 ms |
232728 KB |
Output is correct |
| 11 |
Correct |
4002 ms |
455156 KB |
Output is correct |
| 12 |
Runtime error |
918 ms |
524288 KB |
Execution killed with signal 9 |
| 13 |
Halted |
0 ms |
0 KB |
- |
