// #pragma GCC optimize("Ofast,no-stack-protector")
// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx,avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>
#define lowbit(x) ((x) & -(x))
#define ml(a, b) ((1ll * (a) * (b)) % M)
#define tml(a, b) (a) = ((1ll * (a) * (b)) % M)
#define ad(a, b) ((0ll + (a) + (b)) % M)
#define tad(a, b) (a) = ((0ll + (a) + (b)) % M)
#define mi(a, b) ((0ll + M + (a) - (b)) % M)
#define tmi(a, b) (a) = ((0ll + M + (a) - (b)) % M)
#define tmin(a, b) (a) = min((a), (b))
#define tmax(a, b) (a) = max((a), (b))
#define iter(a) (a).begin(), (a).end()
#define riter(a) (a).rbegin(), (a).rend()
#define init(a, b) memset((a), (b), sizeof(a))
#define cpy(a, b) memcpy((a), (b), sizeof(a))
#define uni(a) a.resize(unique(iter(a)) - a.begin())
#define size(x) (int)x.size()
#define pb emplace_back
#define mpr make_pair
#define ls(i) ((i) << 1)
#define rs(i) ((i) << 1 | 1)
#define INF 0x3f3f3f3f
#define NIF 0xc0c0c0c0
#define eps 1e-9
#define F first
#define S second
#define AC cin.tie(0)->sync_with_stdio(0)
using namespace std;
typedef long long llt;
typedef __int128_t lll;
typedef pair<int, int> pii;
typedef pair<double, double> pdd;
typedef pair<llt, llt> pll;
typedef pair<llt, int> pli;
typedef complex<double> cd;
// const int M = 998244353;
// random_device rm;
// mt19937 rg(rm());
// default_random_engine rg(rm());
// uniform_int_distribution<int> rd(INT_MIN, INT_MAX);
// uniform_real_distribution<double> rd(0, M_PI);
void db() { cerr << "\n"; }
template <class T, class... U>
void db(T a, U... b) { cerr << a << " ", db(b...); }
inline char gc()
{
const static int SZ = 1 << 16;
static char buf[SZ], *p1, *p2;
if (p1 == p2 && (p2 = buf + fread(p1 = buf, 1, SZ, stdin), p1 == p2))
return -1;
return *p1++;
}
void rd() {}
template <typename T, typename... U>
void rd(T &x, U &...y)
{
x = 0;
bool f = 0;
char c = gc();
while (!isdigit(c))
f ^= !(c ^ 45), c = gc();
while (isdigit(c))
x = (x << 1) + (x << 3) + (c ^ 48), c = gc();
f && (x = -x), rd(y...);
}
template <typename T>
void prt(T x)
{
if (x < 0)
putchar('-'), x = -x;
if (x > 9)
prt(x / 10);
putchar((x % 10) ^ 48);
}
typedef array<int, 4> ar4;
const int N = 3e5 + 15;
char s[N];
set<int> st;
ar4 ar[N << 2];
int ln, an[N], bs[N], n, q;
inline void cg(int p, int v)
{
for (; p < N; p += lowbit(p))
bs[p] += v;
}
inline int qy(int p)
{
int v = 0;
for (; p; p -= lowbit(p))
v += bs[p];
return v;
}
void slv(int l, int r)
{
if (l >= r - 1)
return;
int m = (l + r + 1) >> 1, p = l;
slv(l, m), slv(m, r);
for (int i = m; i < r; i++)
{
if (ar[i][2])
continue;
while (p <= m && ar[p][1] > ar[i][1])
cg(ar[p][3], ar[p][2]), p++;
an[ar[i][3]] += qy(ar[i][3]);
}
for (int i = l; i < p; i++)
cg(ar[i][3], -ar[i][2]);
inplace_merge(ar + l, ar + m, ar + r, [&](const ar4 &a, const ar4 &b)
{ return a[1] > b[1]; });
}
signed main()
{
int x, y;
char op[10];
scanf("%d%d%s", &n, &q, s + 1);
for (int i = 1; i <= n; i++)
if (!(s[i] -= '0'))
st.insert(i);
st.insert(0), st.insert(n + 1);
init(an, -1);
for (int i = 1; i <= q; i++)
{
scanf("%s", op);
if (op[0] == 't')
{
scanf("%d", &x);
if (s[x])
{
auto it = st.insert(x).F;
int l = *prev(it), r = *next(it);
ar[ln++] = {l, r, i, i};
ar[ln++] = {l, x, -i, i};
ar[ln++] = {x, r, -i, i};
}
else
{
auto it = st.lower_bound(x);
int l = *prev(it), r = *next(it);
ar[ln++] = {l, r, -i, i};
ar[ln++] = {l, x, i, i};
ar[ln++] = {x, r, i, i};
st.erase(it);
}
s[x] ^= 1;
}
else
{
scanf("%d%d", &x, &y), y--;
an[i] = *st.lower_bound(x) <= y ? 0 : i;
ar[ln++] = {x, y, 0, i};
}
}
sort(ar, ar + ln), slv(0, ln);
for (int i = 1; i <= q; i++)
if (~an[i])
printf("%d\n", an[i]);
}
Compilation message
street_lamps.cpp: In function 'int main()':
street_lamps.cpp:126:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
126 | scanf("%d%d%s", &n, &q, s + 1);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
street_lamps.cpp:134:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
134 | scanf("%s", op);
| ~~~~~^~~~~~~~~~
street_lamps.cpp:137:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
137 | scanf("%d", &x);
| ~~~~~^~~~~~~~~~
street_lamps.cpp:159:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
159 | scanf("%d%d", &x, &y), y--;
| ~~~~~^~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
4440 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
238 ms |
22152 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
4440 KB |
Output is correct |
| 2 |
Correct |
3 ms |
4444 KB |
Output is correct |
| 3 |
Incorrect |
2 ms |
4444 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
4444 KB |
Output is correct |
| 2 |
Correct |
2 ms |
4444 KB |
Output is correct |
| 3 |
Correct |
2 ms |
4444 KB |
Output is correct |
| 4 |
Correct |
2 ms |
4444 KB |
Output is correct |
| 5 |
Correct |
397 ms |
21428 KB |
Output is correct |
| 6 |
Correct |
399 ms |
25556 KB |
Output is correct |
| 7 |
Correct |
354 ms |
31580 KB |
Output is correct |
| 8 |
Correct |
331 ms |
36148 KB |
Output is correct |
| 9 |
Incorrect |
269 ms |
25384 KB |
Output isn't correct |
| 10 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
4440 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
