Submission #50898

#	Time	Username	Problem	Language	Result	Execution time	Memory
50898		tmwilliamlin168	Board (CEOI13_board)	C++14	100 / 100	122 ms	2180 KiB

board

#include <bits/stdc++.h>
using namespace std;

#define ll long long

const int mxD=1e5, bs=62, mxBC=mxD/bs+1;
int sa, sb, ans=2*mxD, a1=0;
ll bva[mxBC], bvb[mxBC];

inline void rd(ll *bv, int &s) {
	bv[0]=1LL<<(bs-1);
	s=1;
	string ms;
	cin >> ms;
	for(char c : ms) {
		if(c=='1') {
			bv[s/bs]&=~(1LL<<(bs-1-s%bs));
			++s;
		} else if(c=='2') {
			bv[s/bs]|=1LL<<(bs-1-s%bs);
			++s;
		} else if(c=='L') {
			bv[(s-1)/bs]-=1LL<<(bs-1-(s-1)%bs);
			for(int i=(s-1)/bs; bv[i]<0; --i) {
				bv[i]+=1LL<<bs;
				--bv[i-1];
			}
		} else if(c=='R') {
			bv[(s-1)/bs]+=1LL<<(bs-1-(s-1)%bs);
			for(int i=(s-1)/bs; bv[i]>=1LL<<bs; --i) {
				bv[i]-=1LL<<bs;
				++bv[i-1];
			}
		} else
			--s;
	}
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	rd(bva, sa);
	rd(bvb, sb);
//	cout << bva[0] << " " << bvb[0] << endl;
	for(int i=0; i<min(sa, sb)&&abs(a1)<=ans; ++i) {
		a1=2*a1+(bva[i/bs]>>(bs-1-i%bs)&1)-(bvb[i/bs]>>(bs-1-i%bs)&1);
//		cout << i << " " << a1 << endl;
		ans=min(abs(a1)+sa-i+sb-i-2, ans);
	}
	cout << ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10