Submission #328546

#	Time	Username	Problem	Language	Result	Execution time	Memory
328546		jc713	Street Lamps (APIO19_street_lamps)	C++17	0 / 100	956 ms	59364 KiB

street_lamps

#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#include <bits/stdc++.h>

using namespace std;
using namespace __gnu_pbds;
template <class T> using Tree = tree<T, null_type, less<T>,
    rb_tree_tag, tree_order_statistics_node_update>;
 
using ll = long long;
using ull = unsigned long long;
using ld = long double;
using db = double; 
using str = string; // yay python!

using pi = pair<int,int>;
using pl = pair<ll,ll>;
using pd = pair<db,db>;

using vi = vector<int>;
using vb = vector<bool>;
using vl = vector<ll>;
using vd = vector<db>; 
using vs = vector<str>;
using vpi = vector<pi>;
using vpl = vector<pl>; 
using vpd = vector<pd>;

#define tcT template<class T
// ^ lol this makes everything look weird but I'll try it
tcT> using V = vector<T>; 
tcT, size_t SZ> using AR = array<T,SZ>; 

// pairs
#define mp make_pair
#define f first
#define s second

// vectors
#define sz(x) (int)(x).size()
#define all(x) begin(x), end(x)
#define rall(x) (x).rbegin(), (x).rend() 
#define sor(x) sort(all(x)) 
#define rsz resize
#define ins insert 
#define ft front() 
#define bk back()
#define pf push_front 
#define pb push_back
#define eb emplace_back 
#define lb lower_bound 
#define ub upper_bound 

// loops
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)

const int MOD = 1e9+7; // 998244353;
const int MX = 2e5+5;
const ll INF = 1e18; // not too close to LLONG_MAX
const int IINF = 1e9;
const ld PI = acos((ld)-1);
const int xd[4] = {1,0,-1,0}, yd[4] = {0,1,0,-1}; // for every grid problem!!
mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count()); 

// helper funcs
constexpr int pct(int x) { return __builtin_popcount(x); } // # of bits set
constexpr int bits(int x) { return 31-__builtin_clz(x); } // floor(log2(x)) 
ll cdiv(ll a, ll b) { return a/b+((a^b)>0&&a%b); } // divide a by b rounded up
ll fdiv(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // divide a by b rounded down

tcT> bool ckmin(T& a, const T& b) {
    return b < a ? a = b, 1 : 0; } // set a = min(a,b)
tcT> bool ckmax(T& a, const T& b) {
    return a < b ? a = b, 1 : 0; }

#define tcTU tcT, class U
tcTU> T fstTrue(T lo, T hi, U f) {
    hi ++; assert(lo <= hi); // assuming f is increasing
    while (lo < hi) { // find first index such that f is true 
        T mid = lo+(hi-lo)/2;
        f(mid) ? hi = mid : lo = mid+1; 
    } 
    return lo;
}
tcTU> T lstTrue(T lo, T hi, U f) {
    lo --; assert(lo <= hi); // assuming f is decreasing
    while (lo < hi) { // find first index such that f is true 
        T mid = lo+(hi-lo+1)/2;
        f(mid) ? lo = mid : hi = mid-1;
    } 
    return lo;
}
tcT> void remDup(vector<T>& v) { // sort and remove duplicates
    sort(all(v)); v.erase(unique(all(v)),end(v)); }
tcTU> void erase(T& t, const U& u) { // don't erase
    auto it = t.find(u); assert(it != end(t));
    t.erase(u); } // element that doesn't exist from (multi)set

// INPUT
#define tcTUU tcT, class ...U
tcT> void re(complex<T>& c);
tcTU> void re(pair<T,U>& p);
tcT> void re(vector<T>& v);
tcT, size_t SZ> void re(AR<T,SZ>& a);

tcT> void re(T& x) { cin >> x; }
void re(db& d) { str t; re(t); d = stod(t); }
void re(ld& d) { str t; re(t); d = stold(t); }
tcTUU> void re(T& t, U&... u) { re(t); re(u...); }

tcT> void re(complex<T>& c) { T a,b; re(a,b); c = {a,b}; }
tcTU> void re(pair<T,U>& p) { re(p.f,p.s); }
tcT> void re(vector<T>& x) { trav(a,x) re(a); }
tcT, size_t SZ> void re(AR<T,SZ>& x) { trav(a,x) re(a); }

// TO_STRING
#define ts to_string
str ts(char c) { return str(1,c); }
str ts(const char* s) { return (str)s; }
str ts(str s) { return s; }
str ts(bool b) { 
    #ifdef LOCAL
        return b ? "true" : "false"; 
    #else 
        return ts((int)b);
    #endif
}
tcT> str ts(complex<T> c) { 
    stringstream ss; ss << c; return ss.str(); }
str ts(vector<bool> v) {
    str res = "{"; F0R(i,sz(v)) res += char('0'+v[i]);
    res += "}"; return res; }
template<size_t SZ> str ts(bitset<SZ> b) {
    str res = ""; F0R(i,SZ) res += char('0'+b[i]);
    return res; }
tcTU> str ts(pair<T,U> p);
tcT> str ts(T v) { // containers with begin(), end()
    #ifdef LOCAL
        bool fst = 1; str res = "{";
        for (const auto& x: v) {
            if (!fst) res += ", ";
            fst = 0; res += ts(x);
        }
        res += "}"; return res;
    #else
        bool fst = 1; str res = "";
        for (const auto& x: v) {
            if (!fst) res += " ";
            fst = 0; res += ts(x);
        }
        return res;

    #endif
}
tcTU> str ts(pair<T,U> p) {
    #ifdef LOCAL
        return "("+ts(p.f)+", "+ts(p.s)+")"; 
    #else
        return ts(p.f)+" "+ts(p.s);
    #endif
}

// OUTPUT
tcT> void pr(T x) { cout << ts(x); }
tcTUU> void pr(const T& t, const U&... u) { 
    pr(t); pr(u...); }
void ps() { pr("\n"); } // print w/ spaces
tcTUU> void ps(const T& t, const U&... u) { 
    pr(t); if (sizeof...(u)) pr(" "); ps(u...); }

// DEBUG
void DBG() { cerr << "]" << endl; }
tcTUU> void DBG(const T& t, const U&... u) {
    cerr << ts(t); if (sizeof...(u)) cerr << ", ";
    DBG(u...); }
#ifdef LOCAL // compile with -DLOCAL, chk -> fake assert
    #define dbg(...) cerr << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
    #define chk(...) if (!(__VA_ARGS__)) cerr << "Line(" << __LINE__ << ") -> function(" \
         << __FUNCTION__  << ") -> CHK FAILED: (" << #__VA_ARGS__ << ")" << "\n", exit(0);
#else
    #define dbg(...) 0
    #define chk(...) 0
#endif

// FILE I/O
void setIn(str s) { freopen(s.c_str(),"r",stdin); }
void setOut(str s) { freopen(s.c_str(),"w",stdout); }
void unsyncIO() { cin.tie(0)->sync_with_stdio(0); }
void setIO(str s = "") {
    unsyncIO();
    // cin.exceptions(cin.failbit); 
    // throws exception when do smth illegal
    // ex. try to read letter into int
    if (sz(s)) { setIn(s+".in"), setOut(s+".out"); } // for USACO
}

struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        // http://xorshift.di.unimi.it/splitmix64.c
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};

template<class T> struct Seg { // comb(ID,b) = b
	const T ID = 0; T comb(T a, T b) { return a+b; }
	int n; vector<T> seg;
	void init(int _n) { n = _n; seg.assign(2*n,ID); }
	void pull(int p) { seg[p] = comb(seg[2*p],seg[2*p+1]); }
	void upd(int p, T val) { // set val at position p
		seg[p += n] += val; for (p /= 2; p; p /= 2) pull(p); }
	void clean(int p, T val) { // set val at position p
		seg[p += n] = val; for (p /= 2; p; p /= 2) pull(p); }
	T query(int l, int r) {	// sum on interval [l, r]
		T ra = ID, rb = ID;
		for (l += n, r += n+1; l < r; l /= 2, r /= 2) {
			if (l&1) ra = comb(ra,seg[l++]);
			if (r&1) rb = comb(seg[--r],rb);
		}
		return comb(ra,rb);
	}
};

struct i{
	int t, l, r, type, qidx;
	i(int _t, int _l, int _r, int _type = -1):t(_t),l(_l),r(_r),type(_type){} // 0 = add, 1 = remove, 2 = query
};

const ll MAX = 300005;

ll ans[MAX];

bitset<MAX> state;

struct cmp {
    bool operator()(const i& x, const i& y) const { return x.l < y.l; }
};

Seg<ll> tree1, tree2;

void cdq(vector<i>& d, int l, int r){
	if(l + 1 == r)
		return;
	int m = (l + r) / 2;
	vector<i> left, right;
	trav(a, d)
		if(a.t < m)
			left.pb(a);
		else
			right.pb(a);
	cdq(left, l, m);
	cdq(right, m, r);
	int i = 0;
	int k = 0;
	ll n1 = 0, n2 = 0;
	set<int> r1, r2;
	F0R(j, sz(right)){
		while(i < sz(left) && left[i].l <= right[j].l){
			d[k++] = left[i];
			if(left[i].type == 0){
				n1++;
				tree1.upd(left[i].r, MAX - left[i].t);
				r1.insert(left[i].r);
			}
			else if(left[i].type == 1){
				n2++;
				tree2.upd(left[i].r, MAX - left[i].t);
				r2.insert(left[i].r);
			}
			i++;
		}
		if(right[j].type == 2){
			ans[right[j].qidx] += (tree1.query(right[j].r - 1, MAX - 1) - n1 * (MAX - right[j].t));
			ans[right[j].qidx] -= (tree2.query(right[j].r - 1, MAX - 1) - n2 * (MAX - right[j].t));
		}
		d[k++] = right[j];
	}
	while(i < sz(left))
		d[k++] = left[i++];
	trav(a, r1)
		tree1.clean(a, 0);
	trav(a, r2)
		tree2.clean(a, 0);
}

int main(){
    setIO();
	tree1.init(524288), tree2.init(524288);
	vector<i> d;
	int n, q;
	cin >> n >> q;
	set<i, cmp> segs;
	string s;
	cin >> s;
	F0R(a, n){
		state[a] = (s[a] == '1');
		if(state[a] == 0)
			continue;
		if(a != 0 && state[a - 1] == 1){
			auto t = --segs.end();
			i temp(t->t, t->l, t->r + 1);
			segs.erase(t);
			segs.insert(temp);
		}
		else
			segs.insert(i(0, a, a));
	}
	set<int> stor;
	FOR(a, 1, q + 1){
		string s;
		cin >> s;
		if(s == "toggle"){
			int x;
			cin >> x;
			x--;
			state[x] = state[x] ^ 1;
			if(state[x] == 1){
				i nxt(a, x, x);
				auto t1 = segs.lb({IINF, x, IINF});
				if(t1 != segs.begin() && (--t1)->r == x - 1)
					nxt.l = t1->l, d.pb({t1->t, t1->l, t1->r, 0}), d.pb({a, t1->l, t1->r, 1}), segs.erase(t1);
				auto t2 = segs.lb({IINF, x, IINF});
				if(t2 != segs.end() && t2->l == x + 1)
					nxt.r = t2->r, d.pb({t2->t, t2->l, t2->r, 0}), d.pb({a, t2->l, t2->r, 1}), segs.erase(t2);
				segs.insert(nxt);
			}
			else{
				auto temp = segs.lb({IINF, x, IINF});
				temp--;
				d.pb({temp->t, temp->l, temp->r, 1});
				d.pb({a, temp->l, temp->r, 0});
				if(temp->l != x)
					segs.insert({a, temp->l, x - 1});
				if(temp->r != x)
					segs.insert({a, x + 1, temp->r});
			}
		}
		else{
			int A, B;
			cin >> A >> B;
			A--, B--;
			d.pb({a, A, B, 2});
			d.back().qidx = a;
			stor.insert(a);
		}
	}
	trav(a, segs)
		d.pb({q + 1, a.l, a.r, 1}), d.pb({a.t, a.l, a.r, 0});
	sort(all(d), [](const i& a, const i& b){return (a.t == b.t ? a.type < b.type : a.t < b.t);});
	cdq(d, 0, q + 2);
	trav(a, stor)
		cout << (ans[a] < 0 ? 0 : ans[a]) << endl;
    // you should actually read the stuff at the bottom
}
 
/* stuff you should look for
    * int overflow, array bounds
    * special cases (n=1?)
    * do smth instead of nothing and stay organized
    * WRITE STUFF DOWN
    * DON'T GET STUCK ON ONE APPROACH
*/

Compilation message (stderr)

street_lamps.cpp: In function 'void setIn(str)':
street_lamps.cpp:190:28: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  190 | void setIn(str s) { freopen(s.c_str(),"r",stdin); }
      |                     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
street_lamps.cpp: In function 'void setOut(str)':
street_lamps.cpp:191:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  191 | void setOut(str s) { freopen(s.c_str(),"w",stdout); }
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20