結果
| 問題 |
No.367 ナイトの転身
|
| コンテスト | |
| ユーザー |
Drafear
|
| 提出日時 | 2016-04-29 23:04:33 |
| 言語 | C++11(廃止可能性あり) (gcc 13.3.0) |
| 結果 |
AC
|
| 実行時間 | 78 ms / 2,000 ms |
| コード長 | 2,659 bytes |
| コンパイル時間 | 1,449 ms |
| コンパイル使用メモリ | 178,100 KB |
| 実行使用メモリ | 17,408 KB |
| 最終ジャッジ日時 | 2024-10-04 18:44:31 |
| 合計ジャッジ時間 | 2,480 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 27 |
コンパイルメッセージ
main.cpp: In function ‘int main()’:
main.cpp:107:41: warning: ‘gy’ may be used uninitialized in this function [-Wmaybe-uninitialized]
107 | REP(i, 2) ans = min(ans, dist[gy][gx][i]);
| ^
main.cpp:107:45: warning: ‘gx’ may be used uninitialized in this function [-Wmaybe-uninitialized]
107 | REP(i, 2) ans = min(ans, dist[gy][gx][i]);
| ^
main.cpp:89:69: warning: ‘sy’ may be used uninitialized in this function [-Wmaybe-uninitialized]
89 | priority_queue<Node, vector<Node>, greater<Node> > Q; Q.push({sx, sy, 0, 0});
| ~~~~~~^~~~~~~~~~~~~~~~
main.cpp:89:69: warning: ‘sx’ may be used uninitialized in this function [-Wmaybe-uninitialized]
ソースコード
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> P;
#define EACH(i,a) for (auto& i : a)
#define FOR(i,a,b) for (ll i=(a);i<(b);i++)
#define RFOR(i,a,b) for (ll i=(b)-1;i>=(a);i--)
#define REP(i,n) for (ll i=0;i<(n);i++)
#define RREP(i,n) for (ll i=(n)-1;i>=0;i--)
#define debug(x) cout<<#x<<": "<<x<<endl
#define pb push_back
#define ALL(a) (a).begin(),(a).end()
const ll linf = 1e18;
const int inf = 1e9;
const double eps = 1e-12;
const double pi = acos(-1);
template<typename T>
istream& operator>>(istream& is, vector<T>& vec) {
EACH(x,vec) is >> x;
return is;
}
/*
template<class... T>
ostream& operator<<(ostream& os, tuple<T...>& t) {
for (size_t i = 0; i < tuple_size< tuple<T...> >::value; ++i) {
if (i) os << " ";
os << get<0>(t);
}
return os;
}
*/
template<typename T>
ostream& operator<<(ostream& os, vector<T>& vec) {
REP(i,vec.size()) {
if (i) os << " ";
os << vec[i];
}
return os;
}
template<typename T>
ostream& operator<<(ostream& os, vector< vector<T> >& vec) {
REP(i,vec.size()) {
if (i) os << endl;
os << vec[i];
}
return os;
}
struct Node {
int x, y, mode, cost;
};
bool operator>(const Node& n1, const Node& n2) {
return n1.cost > n2.cost;
}
int H, W;
vector<string> m;
bool inRange(int x, int y) {
return 0 <= x && x < W && 0 <= y && y < H;
}
vector< vector<P> > nxt = {
{{1, 2}, {2, 1}, {1, -2}, {2, -1}, {-1, 2}, {-2, 1}, {-1, -2}, {-2, -1}},
{{1, 1}, {1, -1}, {-1, 1}, {-1, -1}},
};
int main() {
std::ios::sync_with_stdio(false);
std::cin.tie(0);
cin >> H >> W;
m.resize(H); cin >> m;
int sx, sy, gx, gy;
REP(y, H) REP(x, W) {
if (m[y][x] == 'S') {
m[y][x] = '.';
sx = x, sy = y;
}
else if (m[y][x] == 'G') {
m[y][x] = '.';
gx = x, gy = y;
}
}
vector< vector< vector<int> > > dist(H, vector< vector<int> >(W, vector<int>(2, inf)));
priority_queue<Node, vector<Node>, greater<Node> > Q; Q.push({sx, sy, 0, 0});
while ( !Q.empty() ) {
Node node = Q.top(); Q.pop();
int x = node.x, y = node.y, cost = node.cost, mode = node.mode;
// cout << x << " " << y << " " << mode << " " << cost << endl;
if (cost > dist[y][x][mode]) continue;
REP(i, nxt[mode].size()) {
int nx = x + nxt[mode][i].first;
int ny = y + nxt[mode][i].second;
if ( !inRange(nx, ny) ) continue;
int nm = m[ny][nx] == 'R' ? !mode : mode;
if ( cost+1 < dist[ny][nx][nm] ) {
dist[ny][nx][nm] = cost+1;
Q.push({nx, ny, nm, dist[ny][nx][nm]});
}
}
}
int ans = inf;
REP(i, 2) ans = min(ans, dist[gy][gx][i]);
if (ans == inf) cout << -1 << endl;
else cout << ans << endl;
}
Drafear