Submission #1120214

#	Time	Username	Problem	Language	Result	Execution time	Memory
1120214		HasanV11010238	Tracks in the Snow (BOI13_tracks)	C++17	75.94 / 100	2126 ms	1048576 KiB

tracks

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long long
#define INF 1000000000
vector<vector<vector<int>>> v;
int bfs(int n, int st){
    vector<int> di(n, INF);
    deque<int> q;
    di[st] = 0;
    q.push_back(st);
    while (!q.empty()){
        int x = q.front();
        q.pop_front();
        for (auto el : v[x]){
            if (di[el[0]] > di[x] + el[1]){
                di[el[0]] = di[x] + el[1];
                if (el[1] == 0){
                    q.push_front(el[0]);
                }
                else{
                    q.push_back(el[0]);
                }
            }
        }
    }
    int ans = 0;
    for (int i = 0; i < n; i++){
        if (di[i] == INF) continue;
        ans = max(ans, di[i]);
    }
    return ans;
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n, m;
    cin>>n>>m;
    map<char, int> ma;
    ma['F'] = 0;
    ma['R'] = 1;
    v.resize(n * m);
    vector<string> s(n);
    for (int i = 0; i < n; i++){
        cin>>s[i];
        for (int j = 0; j < m; j++){
            if (s[i][j] == '.') continue;
            int v1 = i * m + j;
            if (i != 0 && s[i - 1][j] != '.'){
                int v2 = (i - 1) * m + j;
                v[v1].push_back({v2, ma[s[i][j]] ^ ma[s[i - 1][j]]});
                v[v2].push_back({v1, ma[s[i][j]] ^ ma[s[i - 1][j]]});
            }
            if (j != 0 && s[i][j - 1] != '.'){
                int v2 = i * m + j - 1;
                v[v1].push_back({v2, ma[s[i][j]] ^ ma[s[i][j - 1]]});
                v[v2].push_back({v1, ma[s[i][j]] ^ ma[s[i][j - 1]]});
            }
        }
    }
    cout<<bfs(n * m, 0) + 1;
}

• Subtask 1: 30 / 30
• Subtask 2: 45.9375 / 70