Submission #907447

#	Time	Username	Problem	Language	Result	Execution time	Memory
907447		arnavai	Tracks in the Snow (BOI13_tracks)	C++14	45.31 / 100	2174 ms	1048576 KiB

tracks

#include <bits/stdc++.h>
using namespace std;
 
#define int long long
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vll;
#define all(x) (x).begin(), (x).end()
#define inf 1000000007
#define llmax LLONG_MAX
#define pi 3.141592653589793238462643383279502884197169399
 
long long binpow(long long a, long long b) {
    long long res = 1;
    while (b > 0) {
        if (b & 1)
            res = res * a;
        a = a * a;
        b >>= 1;
    }
    return res;
}
ll ncr(int n, int r)
{
    if (n < r) return 0;
    long long p = 1, k = 1;
    if (n - r < r)
        r = n - r;
    if (r != 0) {
        while (r) {
            p *= n;
            k *= r;
            long long m = __gcd(p, k);
            p /= m;
            k /= m;
            n--;
            r--;
        }
    }
    else
        p = 1;
    return p;
}

vector <ll> vcreate(int n){
    vector <ll> v(n);
    for (int i = 0; i < n; i++)
    {
        cin>>v[i];
    }
    return v;
}

void dfs(vector<vector<char>>&v, char z, int x, int y)
{
    char find;
    if(z=='R') 
    {
        v[x][y]='F';
        find='R';
    }
    else
    {
        v[x][y]='R';
        find = 'F';
    }
    int h = v.size();
    int w = v[0].size();
    int dx[] = {-1, 1, 0, 0};
    int dy[] = {0,0,-1,1};
    for(int i = 0; i<4; i++)
    {
        if(x+dx[i]>=0 and x+dx[i]<h and y+dy[i]>=0 and y+dy[i]<w and v[x+dx[i]][y+dy[i]]==find)
        {
            dfs(v, z, x+dx[i], y+dy[i]);
        }
    }
}
signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout); 

    int h, w; cin>>h>>w;
    vector<vector<char>>v(h, vector<char>(w));
    for(int i = 0; i<h; i++)
    {
        for(int j = 0; j<w; j++)
        {
            cin>>v[i][j];
        }
    }
    int ans = 1;
    while(true)
    {
        char z = v[0][0];
        dfs(v, z, 0, 0);
        ans++;
        set<char> s;
        for(int i =0; i<h; i++)
        {
            for(int j = 0; j<w; j++)
            {
                if(v[i][j]!='.') s.insert(v[i][j]);
            }
        }
        if(s.size()==1) break;
        
    }
    cout<<ans<<'\n';

}

• Subtask 1: 30 / 30
• Subtask 2: 15.3125 / 70