Submission #154730

#	Time	Username	Problem	Language	Result	Execution time	Memory
154730		Pro_ktmr	Street Lamps (APIO19_street_lamps)	C++14	20 / 100	1709 ms	29232 KiB

street_lamps

#include"bits/stdc++.h"
using namespace std;
#define LL long long
#define MP make_pair

//RMaxQ RUQ
struct SegmentTree{
private:
    int N;
    vector<long long> node, lazy;
    vector<bool> lazyFlg;
public:
    void init(int n){
        N = 1;
        while(N < n) N *= 2;
        node.clear();
        lazy.clear();
        lazyFlg.clear();
        for(int i=0; i<N*2-1; i++){
            node.push_back(1000000000);
            lazy.push_back(0);
            lazyFlg.push_back(false);
        }
    }
    void eval(int k, int l, int r){
        if(lazyFlg[k] == false) return;
        node[k] = lazy[k];
        lazyFlg[k] = false;
        if(r-l > 1){
            lazy[2*k+1] = lazy[k];
            lazyFlg[2*k+1] = true;
            lazy[2*k+2] = lazy[k];
            lazyFlg[2*k+2] = true;
        }
    }
    void update(int a, int b, long long x, int k=0, int l=0, int r=-1){
        if(r == -1) r = N;
        eval(k, l, r);
        if(r <= a || b <= l) return;
        if(a <= l && r <= b){
            lazy[k] = x;
            lazyFlg[k] = true;
            eval(k, l, r);
        }
        else{
            update(a, b, x, 2*k+1, l, (l+r)/2);
            update(a, b, x, 2*k+2, (l+r)/2, r);
            node[k] = max(node[2*k+1], node[2*k+2]);
        }
    }
    long long query(int a, int b, int k=0, int l=0, int r=-1){
        if(r == -1) r = N;
        eval(k, l, r);
        if(r <= a || b <= l) return -1;
        if(a <= l && r <= b) return node[k];
        else return max(query(a, b, 2*k+1, l, (l+r)/2), query(a, b, 2*k+2, (l+r)/2, r));
    }
};

int N,Q;
string def;
int t[300000],a[300000],b[300000];
SegmentTree st;

int main(){
	cin >> N >> Q;
	st.init(N);
	cin >> def;
	for(int i=0; i<N; i++){
		if(def[i] == '1') st.update(i, i+1, 0);
	}
	for(int i=0; i<Q; i++){
		string type;
		cin >> type;
		if(type == "toggle"){
			t[i] = 0;
			cin >> a[i];
			a[i]--;
			st.update(a[i], a[i]+1, i+1);
		}
		else{
			t[i] = 1;
			cin >> a[i] >> b[i];
			a[i]--; b[i]--;
			int tmp = st.query(a[i], b[i]);
			if(tmp == 1000000000) cout << 0 << endl;
			else cout << i+1 - tmp << endl;
		}
	}
	
	return 0;
}

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