Submission #902557

#	Time	Username	Problem	Language	Result	Execution time	Memory
902557		qin	Crossing (JOI21_crossing)	C++17	3 / 100	233 ms	31492 KiB

Main

#include <bits/stdc++.h>
#define fi first
#define se second
#define ssize(x) int(x.size())
#define pn printf("\n")
#define all(x) x.begin(),x.end()
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
int inf = 2e09; ll infll = 2e18;
vector<string> get_strings(string &xx, string &y, string &z){
		string s[3] = {xx, y, z};
		int n = int(s[0].length());
		map<string, int> mp;
		queue<string> q;
		for(int l = 0; l < 3; ++l) mp[s[l]] = 1, q.emplace(s[l]);
		char t[3] = {'J', 'O', 'I'};
		//~ int cnt = 0;
		vector<string> ret;
		while(!q.empty()){
				string x = q.front(); q.pop();
				string tt = ""; tt.resize(n);
				for(int l = 0; l < 3; ++l){
						for(int i = 0; i < n; ++i) if(x[i] == s[l][i]) tt[i] = x[i];
												   else{
														int a, b;
														for(int j = 0; j < 3; ++j) if(t[j] == x[i]) a = j;
														for(int j = 0; j < 3; ++j) if(t[j] == s[l][i]) b = j;
														if(a && b) tt[i] = t[0];
														else if(max(a, b) > 1) tt[i] = t[1];
														else tt[i] = t[2];
												   }
						if(mp[tt] != 1) mp[tt] = 1, q.emplace(tt); //, cout << ":\n" << x << "\n" << s[l] << "\n" << tt << "\n\n";
				}
				//~ cout << x << "\n";
				ret.emplace_back(x);
		}
		return ret;
}
ll mod = 998244353ll;
int base = 1;
struct seg{
		vector<ll> t, p, tmp, powp;
		void build(int i, int s, int e){
				for(int j = s; j <= e; ++j) tmp[i] += powp[j];
				int mid = (s+e)>>1;
				if(s != e) build(i<<1, s, mid), build(i<<1|1, mid+1, e);
		}
		void init(int n){
				while(base < n) base <<= 1;
				t.resize(base<<1, 0), tmp.resize(base<<1, 0), powp.resize(base+1), p.resize(base<<1, 0);
				powp[0] = 1;
				for(int i = 1; i <= base; ++i) powp[i] = powp[i-1]*998244353ll;
				build(1, 1, base);
		}
		void add(int i, ll pr){ t[i] = tmp[i]*pr, p[i] = pr; }
		void push(int i){ if(p[i]) add(i<<1, p[i]), add(i<<1|1, p[i]), p[i] = 0; }
		void update(int i, int s, int e, int x, int y, ll pr){
				if(x <= s && e <= y) return void(add(i, pr));
				int mid = (s+e)>>1; push(i);
				if(x <= mid) update(i<<1, s, mid, x, y, pr);
				if(mid < y) update(i<<1|1, mid+1, e, x, y, pr);
				t[i] = t[i<<1]+t[i<<1|1];
		}
};
void answer(){
		int n, q; scanf("%d", &n);
		string s[3] = {"", "", ""}, t="";
		char c;
		for(int l = 0; l < 3; ++l){
				c = getchar_unlocked();
				for(int i = 0; i < n; ++i) c = getchar_unlocked(), s[l] += c;
		}
		scanf("%d\n", &q);
		for(int i = 0; i < n; ++i) c = getchar_unlocked(), t += c;
		vector<string> st = get_strings(s[0], s[1], s[2]);
		
		vector<ll> powp(n+1); powp[0] = 1;
		for(int i = 1; i <= n; ++i) powp[i] = powp[i-1]*998244353ll;
		
		unordered_map<ll, bool> mp;
		for(string &u : st){
				ll hash = 0;
				for(int i = 0; i < n; ++i) hash += ll(u[i])*powp[i+1];
				mp[hash] = 1;
				//~ printf("%lld\n", hash);
		}
		
		seg seg; seg.init(n+1);
		for(int i = 0; i < n; ++i) seg.t[i+base] = ll(t[i])*powp[i+1];
		for(int i = base-1; i; --i) seg.t[i] = seg.t[i<<1]+seg.t[i<<1|1];
		printf(mp[seg.t[1]] ? "Yes\n" : "No\n");
		//~ printf("%lld\n", seg.t[1]);
		
		for(++q; --q; ){
				int a, b; 
				scanf("%d%d %c", &a, &b, &c);
				seg.update(1, 1, base, a, b, ll(c));
				printf(mp[seg.t[1]] ? "Yes\n" : "No\n");
				//~ printf("%lld\n", seg.t[1]);
		}
}
int main(){
		int T = 1;
		//~ ios_base::sync_with_stdio(0); cin.tie(0);
		for(++T; --T; ) answer();
		return 0;
}

Compilation message (stderr)

Main.cpp: In function 'void answer()':
Main.cpp:67:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |   int n, q; scanf("%d", &n);
      |             ~~~~~^~~~~~~~~~
Main.cpp:74:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |   scanf("%d\n", &q);
      |   ~~~~~^~~~~~~~~~~~
Main.cpp:97:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   97 |     scanf("%d%d %c", &a, &b, &c);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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