Submission #726988

#	Time	Username	Problem	Language	Result	Execution time	Memory
726988		TB_	Tracks in the Snow (BOI13_tracks)	C++17	100 / 100	1907 ms	139300 KiB

tracks

#include <bits/stdc++.h>
using namespace std;

// #undef _GLIBCXX_DEBUG                // disable run-time bound checking, etc
// #pragma GCC optimize("Ofast,inline") // Ofast = O3,fast-math,allow-store-data-races,no-protect-parens
// #pragma GCC optimize ("unroll-loops")

// #pragma GCC target("bmi,bmi2,lzcnt,popcnt")                      // bit manipulation
// #pragma GCC target("movbe")                                      // byte swap
// #pragma GCC target("aes,pclmul,rdrnd")                           // encryption
// #pragma GCC target("avx,avx2,f16c,fma,sse3,ssse3,sse4.1,sse4.2") // SIMD

// #include <bits/extc++.h>
// using namespace __gnu_pbds;
// template<class T>using ordered_set = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;
// template<class T>using ordered_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define ll long long
#define INF (ll)1e9+7
#define fo(i, n) for(int i=0;i<(int)n;i++)
#define Fo(i, k, n) for(i=k;k<n?i<n:i>n;k<n?i+=1:i-=1)
#define deb(x) cout << #x << " = " << x << endl;
#define deb2(x, y) cout << #x << " = " << x << ", " << #y << " = " << y << endl
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define LSOne(S) ((S) & (-S))
#define sp(x, y) fixed<<setprecision(y)<<x
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define clr(x) memset(x, 0, sizeof(x))
#define tr(it, x) for(auto it = x.begin(); it != x.end(); it++)
#define trr(it, x) for(auto it = x.rbegin(); it != x.rend(); it+)
inline int readint(){ int v = 0; char c; while((c = getchar()) != EOF && c != ' ' && c != '\n'){ v *= 10; v += c - '0'; } return v; }
inline int readintsigned() { int v = 0; int sign = 1; char c = getchar(); if (c == '-') { sign = -1; } else { v += c - '0'; } while ((c = getchar()) != EOF && c != ' ' && c != '\n') { v *= 10; v += c - '0'; } return v * sign; }
inline string readstring() { string s; char c; while ((c = getchar()) != EOF && c != '\n' && c != ' ') { s.push_back(c); } return s; }
template <class result_t=std::chrono::milliseconds,class clock_t=std::chrono::steady_clock,class duration_t = std::chrono::milliseconds>
auto since(std::chrono::time_point<clock_t, duration_t> const& start){return std::chrono::duration_cast<result_t>(clock_t::now() - start);}
typedef pair<int, int> pii;
typedef pair<ll, ll> pl;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vpii;
typedef vector<pl> vpl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef vector<vpii> vvpii;
typedef vector<vpl> vvpl;



int main() {
    // cout << fixed << setprecision(20);
    // auto start = std::chrono::steady_clock::now(); // since(start).count()
    cin.tie(0)->sync_with_stdio(0);
    cin.exceptions(cin.failbit); // remove if to endof file

    int n, m, x, y, type;
    char val;
    cin >> n >> m;
    vvi grid(n, vi(m, 0));
    fo(i, n){
        fo(j, m){
            cin >> val;
            if(val == 'F') grid[i][j] = 1;
            else if(val == 'R') grid[i][j] = 2;
        }
    }
    queue<tuple<int, int, int>> q;
    queue<tuple<int, int, int>> q2;
    q.push({0, 0, grid[0][0]});

    vpii dirs = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};
    int ans = 0;

    while(!q.empty()){
        ans++;
        tie(x, y, type) = q.front();
        int base = type;
        while(!q.empty()){
            tie(x, y, type) = q.front();
            q.pop();
            if(x<0 || x>=n || y<0 || y>=m) continue;
            type = grid[x][y];
            if(!type) continue;
            if(type != base){
                q2.push({x, y, type});
                continue;
            }
            grid[x][y] = 0;
            fo(i, 4) q.push({x+dirs[i].F, y+dirs[i].S, type});
        }
        swap(q, q2);
    }
    cout << ans;

    return 0;
}

• Subtask 1: 30 / 30
• Subtask 2: 70 / 70