//#pragma GCC optimize ("O3")
//#pragma GCC target ("sse4")
#include <bits/stdc++.h>
using namespace std;
template<class T> using min_heap = priority_queue<T, vector<T>, greater<T>>;
#define FOR(i, a, b) for (int i=a; i<(b); i++)
#define F0R(i, a) for (int i=0; i<(a); i++)
#define F0R1(i, a) for (int i=1; i<=(a); i++)
#define FORd(i, a, b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i, a) for (int i = (a)-1; i >= 0; i--)
#define trav(a, x) for (auto& a : x)
#define MIN(a, b) a = min(a, b)
#define MAX(a, b) a = max(a, b)
#define INF 1000000010
#define LL_INF 4500000000000000000LL
#define LSOne(S) (S & (-S))
#define EPS 1e-9
#define pA first
#define pB second
#define mp make_pair
#define mt make_tuple
#define pb push_back
#define eb emplace_back
#define PI acos(-1.0)
#define MOD2 (int)(2e+9+11)
#define MOD (int)(1e+9+7)
#define SET(vec, val, size) for (int i = 0; i < size; i++) vec[i] = val;
#define SET2D(arr, val, dim1, dim2) F0R(i, dim1) F0R(j, dim2) arr[i][j] = val;
#define SET3D(arr, val, dim1, dim2, dim3) F0R(i, dim1) F0R(j, dim2) F0R(k, dim3) arr[i][j][k] = val;
#define SET4D(arr, val, dim1, dim2, dim3, dim4) F0R(i, dim1) F0R(j, dim2) F0R(k, dim3) F0R(l, dim4) arr[i][j][k][l] = val;
#define lb lower_bound
#define ub upper_bound
#define sz(x) (int)x.size()
#define beg(x) x.begin()
#define en(x) x.end()
#define all(x) beg(x), en(x)
#define resz resize
#define SORT(vec) sort(all(vec))
#define RSORT(vec) sort(vec.rbegin(),vec.rend())
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
typedef pair<int, int> ii;
typedef pair<int, ii> iii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<iii> viii;
typedef vector<ll> vl;
// @formatter:off
// Source: Benq (https://github.com/bqi343/USACO) [Modified]
namespace input {
template<class T> void re(complex<T>& x);
template<class T1, class T2> void re(pair<T1,T2>& p);
template<class T> void re(vector<T>& a);
template<class T, size_t SZ> void re(array<T,SZ>& a);
template<class T> void reA(T A[], int sz);
template<class T> void re(T& x) { cin >> x; }
void re(double& x) { string t; re(t); x = stod(t); }
void re(ld& x) { string t; re(t); x = stold(t); }
template<class Arg, class... Args> void re(Arg& first, Args&... rest) {
re(first); re(rest...);
}
template<class T1, class T2> void re(pair<T1,T2>& p) { re(p.pA,p.pB); }
template<class T> void re(vector<T>& a) { F0R(i,sz(a)) re(a[i]); }
template<class T, size_t SZ> void re(array<T,SZ>& a) { F0R(i,SZ) re(a[i]); }
template<class T> void reA(T A[], int sz) { F0R(i, sz) re(A[i]); }
void setupIO(const string &PROB = "") {
ios::sync_with_stdio(false);
cin.tie(nullptr);
if (PROB.length() != 0) {
ifstream infile(PROB + ".in");
if (infile.good()) {
freopen((PROB + ".in").c_str(), "r", stdin);
freopen((PROB + ".out").c_str(), "w", stdout);
}
}
}
}
using namespace input;
namespace output {
template<class T1, class T2> void prD(const pair<T1,T2>& x);
template<class T, size_t SZ> void prD(const array<T,SZ>& x);
template<class T> void prD(const vector<T>& x);
template<class T> void prD(const set<T>& x);
template<class T1, class T2> void prD(const map<T1,T2>& x);
template<class T1, class T2> void pr(const pair<T1,T2>& x);
template<class T, size_t SZ> void pr(const array<T,SZ>& x);
template<class T> void pr(const vector<T>& x);
template<class T> void pr(const set<T>& x);
template<class T1, class T2> void pr(const map<T1,T2>& x);
template<class T> void prD(const T& x) { cout << x; cout.flush(); }
template<class Arg, class... Args> void prD(const Arg& first, const Args&... rest) {
prD(first); prD(rest...);
}
template<class T1, class T2> void prD(const pair<T1,T2>& x) {
prD("{",x.pA,", ",x.pB,"}");
}
template<class T> void prDContain(const T& x) {
prD("{");
bool fst = 1; for (const auto& a: x) prD(!fst?", ":"",a), fst = 0; // const needed for vector<bool>
prD("}");
}
template<class T, size_t SZ> void prD(const array<T,SZ>& x) { prDContain(x); }
template<class T> void prD(const vector<T>& x) { prDContain(x); }
template<class T> void prD(const set<T>& x) { prDContain(x); }
template<class T1, class T2> void prD(const map<T1,T2>& x) { prDContain(x); }
void psD() { prD("\n"); }
template<class Arg> void psD(const Arg& first) {
prD(first); psD(); // no space at end of line
}
template<class Arg, class... Args> void psD(const Arg& first, const Args&... rest) {
prD(first," "); psD(rest...); // print w/ spaces
}
template<class T> void pr(const T& x) { cout << x; }
template<class Arg, class... Args> void pr(const Arg& first, const Args&... rest) {
pr(first); pr(rest...);
}
template<class T1, class T2> void pr(const pair<T1,T2>& x) {
pr(x.pA, " ", x.pB);
}
template<class T> void prContain(const T& x) {
bool fst = 1; for (const auto& a: x) pr(!fst?" ":"",a), fst = 0; // const needed for vector<bool>
}
template<class T, size_t SZ> void pr(const array<T,SZ>& x) { prContain(x); }
template<class T> void pr(const vector<T>& x) { prContain(x); }
template<class T> void pr(const set<T>& x) { prContain(x); }
template<class T1, class T2> void pr(const map<T1,T2>& x) { prContain(x); }
void ps() { pr("\n"); }
template<class Arg> void ps(const Arg& first) {
pr(first); ps(); // no space at end of line
}
template<class Arg, class... Args> void ps(const Arg& first, const Args&... rest) {
pr(first," "); ps(rest...); // print w/ spaces
}
}
using namespace output;
// @formatter:on
/* ============================ */
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
struct item {
int key, pr, cnt = 1, val = 0, sum = 0;
item *l, *r;
};
typedef item* pitem;
int cnt (pitem t) {
return t ? t->cnt : 0;
}
int sum(pitem t) {
return t ? t->sum : 0;
}
void upd (pitem t) {
if (t) {
t->cnt = 1 + cnt(t->l) + cnt(t->r);
t->sum = t->val + sum(t->l) + sum(t->r);
}
}
void split (pitem t, int key, pitem & l, pitem & r) {
if (!t)
l = r = NULL;
else if (key < t->key)
split (t->l, key, l, t->l), r = t;
else
split (t->r, key, t->r, r), l = t;
upd(t);
}
void insert (pitem & t, pitem it) {
if (!t)
t = it;
else if (it->pr > t->pr)
split (t, it->key, it->l, it->r), t = it;
else
insert (it->key < t->key ? t->l : t->r, it);
upd(t);
}
bool update (pitem & t, int k, int v, int pr) {
if (!t) {
return false;
} else if (t->key == k) {
t->val += v;
upd(t);
return true;
} else {
return update(k < t->key ? t->l : t->r, k, v, pr);
}
}
void update(pitem &root, int k, int v) {
if (!update(root, k, v, rng())) {
pitem it = new item();
it->key = k; it->val = v; it->pr = rng();
insert(root, it);
}
}
void merge (pitem & t, pitem l, pitem r) {
if (!l || !r)
t = l ? l : r;
else if (l->pr > r->pr)
merge (l->r, l->r, r), t = l;
else
merge (r->l, l, r->l), t = r;
upd(t);
}
int query(pitem root, int L, int R) {
pitem t1, t2, t3;
split(root, L - 1, t1, t2);
split(t2, R, t2, t3);
int val = t2 ? t2->sum : 0;
merge(root, t1, t2);
merge(root, t1, t3);
return val;
}
pitem fenwickTree[300005];
int n, q;
vector<bool> A;
int query(int a, int b) {
int val = 0;
for (; a; a -= LSOne(a)) {
val += query(fenwickTree[a], 0, b);
}
return val;
}
void upd(int k, int l, int r, int v) {
for (; k <= n; k += LSOne(k)) {
update(fenwickTree[k], l, v);
update(fenwickTree[k], r+1, -v);
}
}
void upd(int minL, int maxL, int minR, int maxR, int v) {
upd(minL, minR, maxR, v);
upd(maxL+1, minR, maxR, -v);
}
int ft[300001];
void upd(int k, int v) {
for (; k <= n; k += LSOne(k)) ft[k] += v;
}
int qry(int k) {
if (k == 0) return 0;
int s = 0; for (; k; k -= LSOne(k)) s += ft[k];
return s;
}
int findLeft(int x) {
int lo = 1, hi = x+1, mid, ans = x;
while (lo < hi) {
mid = (lo + hi)/2;
int val = qry(x)-qry(mid - 1);
if (val == x-mid + 1) {
hi = mid;
ans = mid;
} else {
lo = mid + 1;
}
}
return ans;
}
int findRight(int x) {
int lo = x, hi = n+1, mid, ans = x;
while (lo < hi) {
mid = (lo + hi)/2;
int val = qry(mid) - qry(x - 1);
if (val == mid-x+1) {
lo = mid + 1;
ans = mid;
} else {
hi = mid;
}
}
return ans;
}
int main() {
setupIO();
re(n, q);
A.resz(n+1);
SET(ft, 0, n+1);
F0R1(i, n) {
char c; re(c);
A[i] = c == '1';
if (A[i]) upd(i, 1);
}
F0R1(i, q) {
string s; re(s);
if (s == "query") {
int a, b; re(a, b);
psD(query(a, b - 1) + (A[b-1] && findLeft(b - 1) <= a ? i : 0));
} else {
int a; re(a);
if (A[a]) {
// switching off
int l = findLeft(a), r = findRight(a);
A[a] = false;
upd(a, -1);
upd(l, a, a, r, i);
} else {
// switching on
A[a] = true;
upd(a, 1);
int l = findLeft(a), r = findRight(a);
upd(l, a, a, r, -i);
}
}
}
return 0;
}
Compilation message
street_lamps.cpp: In function 'void input::setupIO(const string&)':
street_lamps.cpp:85:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
freopen((PROB + ".in").c_str(), "r", stdin);
~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
street_lamps.cpp:86:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
freopen((PROB + ".out").c_str(), "w", stdout);
~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
5 ms |
384 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
930 ms |
18456 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
7 ms |
768 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
10 ms |
384 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
5 ms |
384 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
