제출 #784384

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
784384		raysh07	포탈들 (BOI14_portals)	C++17	20 / 100	22 ms	28116 KiB

portals

#include <bits/stdc++.h>
using namespace std;
#define INF (int)1e9

mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

int n, m;
const int N = 1005;
bool a[N][N];
int d[N][N];
int x, y;
vector <pair<int, int>> ok[N][N];

bool good(int x, int y){
    if (!a[x - 1][y]) return true;
    if (!a[x + 1][y]) return true;
    if (!a[x][y - 1]) return true;
    if (!a[x][y + 1]) return true;
    return false;
}

void Solve()
{
	cin >> n >> m;

	queue <pair<int, int>> q;

	for (int i = 1; i <= n; i++){
		string s; cin >> s;

		for (int j = 1; j <= m; j++){
			ok[i][j].push_back({i - 1, j});
			ok[i][j].push_back({i, j + 1});
			ok[i][j].push_back({i + 1, j});
			ok[i][j].push_back({i, j - 1});
			d[i][j] = INF;
			if (s[j - 1] == 'S'){
				a[i][j] = true;
				d[i][j] = 0;
				q.push({i, j});
			} else if (s[j - 1] == 'C'){
				a[i][j] = true;
				x = i;
				y = j;
			} else if (s[j - 1] == '.'){
				a[i][j] = true;
			}
		}
	}

	for (int i = 1; i <= n; i++){
		int last = 0;
		for (int j = 1; j <= m; j++){
		    if (good(i, j))
			ok[i][j].push_back({i, last});
			if (!a[i][j]) last = 0;
			else if (last == 0) last = j;
		}

		last = 0;
		for (int j = m; j >= 1; j--){
		    if (good(i, j))
			ok[i][j].push_back({i, last});
			if (!a[i][j]) last = 0;
			else if (last == 0) last = j;
		}
	}

	for (int j = 1; j <= m; j++){
		int last = 0;
		for (int i = 1; i <= n; i++){
		    if (good(i, j))
			ok[i][j].push_back({last, j});
			if (!a[i][j]) last = 0;
			else if (last == 0) last = i;
		}

		last = 0;
		for (int i = n; i >= 1; i--){
		    if (good(i, j))
			ok[i][j].push_back({last, j});
			if (!a[i][j]) last = 0;
			else if (last == 0) last = i;
		}
	}

	while (!q.empty()){
		auto pi = q.front(); q.pop();
		int ux = pi.first, uy = pi.second;
	//	cout << ux << " " << uy << "\n";

		for (auto [vx, vy] : ok[ux][uy]){
		    if (!a[vx][vy]) continue;
			if (d[vx][vy] == INF){
				d[vx][vy] = d[ux][uy] + 1;
				q.push({vx, vy});
			}
		}
	}

	cout << d[x][y] << "\n";
}

int32_t main() 
{
    auto begin = std::chrono::high_resolution_clock::now();
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t = 1;

   // freopen("in",  "r", stdin);
   // freopen("out", "w", stdout);

  //  cin >> t;
    for(int i = 1; i <= t; i++) 
    {
        //cout << "Case #" << i << ": ";
        Solve();
    }
    auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n"; 
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

portals.cpp: In function 'void Solve()':
portals.cpp:54:7: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   54 |       if (good(i, j))
      |       ^~
portals.cpp:56:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   56 |    if (!a[i][j]) last = 0;
      |    ^~
portals.cpp:62:7: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   62 |       if (good(i, j))
      |       ^~
portals.cpp:64:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   64 |    if (!a[i][j]) last = 0;
      |    ^~
portals.cpp:72:7: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   72 |       if (good(i, j))
      |       ^~
portals.cpp:74:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   74 |    if (!a[i][j]) last = 0;
      |    ^~
portals.cpp:80:7: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   80 |       if (good(i, j))
      |       ^~
portals.cpp:82:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   82 |    if (!a[i][j]) last = 0;
      |    ^~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 20
• Subtask 3: 20 / 20
• Subtask 4: 0 / 19
• Subtask 5: 0 / 30