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4318. 最短路径
https://www.acwing.com/problem/content/submission/code_detail/12517850/
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AcWing/4318/4318.cpp
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47
AcWing/4318/4318.cpp
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#include <iostream>
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#include <map>
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#include <string>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int to[5][2] = {{0, 0}, {0, -1}, {0, 1}, {-1, 0}, {1, 0}};
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int x, y;
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std::string s;
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std::map<int, std::map<int, bool>> vis;
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int main() {
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std::ios::sync_with_stdio(false);
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cin >> s;
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vis[x][y] = true;
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for (char c : s) {
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int xx = 0, yy = 0;
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if (c == 'U') {
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y--;
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yy--;
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} else if (c == 'D') {
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y++;
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yy++;
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} else if (c == 'L') {
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x--;
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xx--;
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} else if (c == 'R') {
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x++;
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xx++;
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}
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if (vis[x][y]) {
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cout << "NO" << endl;
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exit(0);
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}
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vis[x][y] = true;
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for (int i = 1; i <= 4; i++) {
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vis[x + to[i][0] - xx][y + to[i][1] - yy] = true;
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}
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}
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cout << "YES" << endl;
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return 0;
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}
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