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OI-codes/AcWing/4318/4318.cpp

48 lines
927 B
C++

#include <iostream>
#include <map>
#include <string>
using std::cin;
using std::cout;
const char endl = '\n';
const int to[5][2] = {{0, 0}, {0, -1}, {0, 1}, {-1, 0}, {1, 0}};
int x, y;
std::string s;
std::map<int, std::map<int, bool>> vis;
int main() {
std::ios::sync_with_stdio(false);
cin >> s;
vis[x][y] = true;
for (char c : s) {
int xx = 0, yy = 0;
if (c == 'U') {
y--;
yy--;
} else if (c == 'D') {
y++;
yy++;
} else if (c == 'L') {
x--;
xx--;
} else if (c == 'R') {
x++;
xx++;
}
if (vis[x][y]) {
cout << "NO" << endl;
exit(0);
}
vis[x][y] = true;
for (int i = 1; i <= 4; i++) {
vis[x + to[i][0] - xx][y + to[i][1] - yy] = true;
}
}
cout << "YES" << endl;
return 0;
}