Submission #126888

#	Time	Username	Problem	Language	Result	Execution time	Memory
126888		eriksuenderhauf	Board (CEOI13_board)	C++11	100 / 100	104 ms	732 KiB

board

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
#define mem(a,v) memset((a), (v), sizeof (a))
#define enl printf("\n")
#define case(t) printf("Case #%d: ", (t))
#define ni(n) scanf("%d", &(n))
#define nl(n) scanf("%lld", &(n))
#define nai(a, n) for (int i = 0; i < (n); i++) ni(a[i])
#define nal(a, n) for (int i = 0; i < (n); i++) nl(a[i])
#define pri(n) printf("%d\n", (n))
#define prl(n) printf("%lld\n", (n))
#define pii pair<int, int>
#define pil pair<int, long long>
#define pll pair<long long, long long>
#define vii vector<pii>
#define vil vector<pil>
#define vll vector<pll>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef cc_hash_table<int,int,hash<int>> ht;
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> oset;
const double pi = acos(-1);
const int MOD = 1e9 + 7;
const int INF = 1e9 + 7;
const int MAXN = 1e5 + 5;
const double eps = 1e-9;
ll bitx[MAXN / 62 + 1], bity[MAXN / 62 + 1];
char str[MAXN];

int process(ll *bit) {
	bit[0] = 2305843009213693952ll;
	scanf("%s", str);
	int n = strlen(str);
	int ret = 1;
	for (int i = 0; i < n; i++) {
		if (str[i] == '1') // add a 0 to the end
			bit[ret / 62] &= 4611686018427387903ll ^ (1ll << (61 - (ret % 62)));
		if (str[i] == '2') // add a 1 to the end
			bit[ret / 62] |= (1ll << (61 - (ret % 62)));
		if (str[i] == '1' || str[i] == '2')
			ret++;
		if (str[i] == 'L') { // go left
			ret--;
			bit[ret / 62] -= (1ll << (61 - (ret % 62)));
			for (int i = ret / 62; bit[i] < 0; i--) {
				bit[i] += 4611686018427387904ll;
				bit[i-1]--;
			}
			ret++;
		}
		if (str[i] == 'R') { // go right
			ret--;
			bit[ret / 62] += (1ll << (61 - (ret % 62)));
			for (int i = ret / 62; bit[i] > 4611686018427387903ll; i--) {
				bit[i] -= 4611686018427387904ll;
				bit[i-1]++;
			}
			ret++;
		}
		if (str[i] == 'U')
			ret--;
	}
	return ret;
}

int main() {
	int n = process(bitx);
	int m = process(bity);
	int cur = 0, ans = INF;
	for (int i = 0; i < min(n, m) && abs(cur) <= ans; i++) {
		cur = 2 * cur + ((bitx[i / 62] >> (61 - (i % 62))) & 1) - ((bity[i / 62] >> (61 - (i % 62))) & 1);
		ans = min(ans, abs(cur) + n + m - 2 * (i+1));
	}
	pri(ans);
    return 0;
}

Compilation message (stderr)

board.cpp: In function 'int process(ll*)':
board.cpp:42:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", str);
  ~~~~~^~~~~~~~~~~

• 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