// Created by ...
#include <bits/stdc++.h>
#define vll vector< ll >
#define M 100000
#define MD 1000000007
#define pb push_back
#define eb emplace_back
#define sz(x) (int)(x).size()
#define pii pair<ll,ll>
#define vec(a) vector<a >
#define all(a) (a).begin(),(a).end()
#define se second
#define fi first
#define inf 0xffffffff
#define int long long
#define endl '\n'
#define rep(i,a,b) for(ll i=a;i<=b;++i)
#define per(i,b,a) for(ll i=b;i>=a;--i)
#define IOS ios::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define EACH(x, a) auto _Itr=begin(a);for (auto x=*_Itr;_Itr!=end(a);_Itr=next(_Itr),x=*_Itr)
using namespace std;
using ll = long long;
using ld = long double;
ll md = MD;
template<class... Args> auto Vec(size_t n, Args&&... args) {
if constexpr(sizeof...(args) == 1)return vector(n, args...);
else return vector(n, Vec(args...));
}
template<class T, class... Args> void DBS(T t, Args... args) {
cerr << t;
if constexpr(sizeof...(args) == 0) cerr << "]\n";
else cerr << ", ", DBS(args...);
}
#ifdef _DEBUG
#define db(...) cerr << "[" << #__VA_ARGS__ << "]: [", DBS(__VA_ARGS__)
#else
#define db(...) 0
#endif
ll exp(ll a, ll b) {ll r = 1ll; while (b > 0) {if (b & 1) {r = r * (a % md); r = (r + md) % md;} b >>= 1; a = (a % md) * (a % md); a = (a + md) % md;} return (r + md) % md;}
ll gcd(ll a, ll b) {if (b == 0)return a; return gcd(b, a % b);}
template<class T> T Min(T a, T b) {if (a < b)return a; return b;}
template<class T> T Max(T a, T b) {if (a > b)return a; return b;}
const int Mx = 4005;
char grid[Mx][Mx];
int h, w, vis[Mx][Mx];
int dx[] = {1, -1, 0, 0};
int dy[] = {0, 0, 1, -1};
void solve() {
cin >> h >> w;
rep(i, 0, h - 1)rep(j, 0, w - 1)cin >> grid[i][j];
queue<pii> q[2];
char curr = grid[0][0];
int id = (curr == 'F' ? 0 : 1), ans = 1;
q[id].push({0, 0});
while (!q[0].empty() || !q[1].empty()) {
if (q[id].empty()) {
++ans;
id ^= 1;
if (curr == 'F')curr = 'R';
else curr = 'F';
}
while (!q[id].empty()) {
auto [x, y] = q[id].front(); q[id].pop();
vis[x][y] = 1;
for (int i = 0; i < 4; ++i) {
int nx = x + dx[i], ny = y + dy[i];
if (nx < 0 || ny < 0 || nx >= h || ny >= w || vis[nx][ny] || grid[nx][ny] == '.')continue;
vis[nx][ny] = 1;
if (grid[nx][ny] == curr)q[id].push({nx, ny});
else q[id ^ 1].push({nx, ny});
}
}
}
cout << ans;
}
int32_t main() {
IOS;
int t = 1;
//cin>>t;
while (t--) {
solve();
}
return 0;
}
Compilation message
tracks.cpp: In function 'auto Vec(size_t, Args&& ...)':
tracks.cpp:29:5: warning: 'if constexpr' only available with '-std=c++17' or '-std=gnu++17'
29 | if constexpr(sizeof...(args) == 1)return vector(n, args...);
| ^~~~~~~~~
tracks.cpp:29:49: error: missing template arguments before '(' token
29 | if constexpr(sizeof...(args) == 1)return vector(n, args...);
| ^
tracks.cpp:30:20: error: missing template arguments before '(' token
30 | else return vector(n, Vec(args...));
| ^
tracks.cpp: In function 'void DBS(T, Args ...)':
tracks.cpp:34:5: warning: 'if constexpr' only available with '-std=c++17' or '-std=gnu++17'
34 | if constexpr(sizeof...(args) == 0) cerr << "]\n";
| ^~~~~~~~~
tracks.cpp: In function 'void solve()':
tracks.cpp:67:9: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
67 | auto [x, y] = q[id].front(); q[id].pop();
| ^
