Submission #1149813

#	Time	Username	Problem	Language	Result	Execution time	Memory
1149813		Issa	Crossing (JOI21_crossing)	C++20	26 / 100	170 ms	7236 KiB

Main

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
#define ent "\n"

const int maxn = 2e5 + 100;
const ll INF = (ll)1e18 + 100;
const int inf = 1e7 + 100;
const ll MOD = 1e9 + 7;
const int maxl = 16;
const ll P = 31;

int n;
struct asd{
	int f, ok;
} d[maxn * 4];
int t[maxn * 4];

int f(char c){
	if(c == 'J') return 0;
	if(c == 'O') return 1;
	return 2;
}

asd ff(asd a, asd b){
	if(a.f != b.f) return {-1, a.ok & b.ok};
	return {a.f, a.ok & b.ok};
}

void build(int v = 1, int tl = 1, int tr = n){
	t[v] = -1;
	if(tl == tr){
		char c; cin >> c;
		d[v] = {f(c), 1};
	} else{
		int mid = (tl + tr) >> 1;
		build(v<<1, tl, mid);
		build(v<<1|1, mid+1, tr);
		d[v] = ff(d[v<<1], d[v<<1|1]);
	}
}

void pre(int v, int x){
	d[v] = {d[v].f, d[v].f == x};
	t[v] = x;
} void push(int v, int tl, int tr){
	if(tl == tr || t[v] == -1) return;
	pre(v<<1, t[v]); pre(v<<1|1, t[v]);
	t[v] = -1;
}

void upd(int l, int r, int x, int v = 1, int tl = 1, int tr = n){
	if(tl > r || tr < l) return;
	if(l <= tl && tr <= r) pre(v, x);
	else{ push(v, tl, tr);
		int mid = (tl + tr) >> 1;
		upd(l, r, x, v<<1, tl, mid);
		upd(l, r, x, v<<1|1, mid+1, tr);
		d[v] = ff(d[v<<1], d[v<<1|1]);
	}
}

void ans(){
	if(d[1].ok) cout << "Yes\n";
	else cout << "No\n";
}

void test(){
	cin >> n; build();
	for(int i = 1; i <= n * 2; i++){
		char c; cin >> c;
	} int q; cin >> q;
	for(int i = 1; i <= n; i++){
		char c; cin >> c;
		upd(i, i, f(c));
	} ans(); while(q--){
		int l, r; char c;
		cin >> l >> r >> c;
		upd(l, r, f(c));
		ans();
	}
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    srand(time(0));
    int t = 1;
    while(t--) test();
}

• Subtask 1: 3 / 3
• Subtask 2: 23 / 23
• Subtask 3: 0 / 23
• Subtask 4: 0 / 51