Submission #1061981

#	Time	Username	Problem	Language	Result	Execution time	Memory
1061981		sikai004	Tracks in the Snow (BOI13_tracks)	C++14	31.77 / 100	642 ms	78716 KiB

tracks

#include <bits/stdc++.h>
using namespace std;
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int row, col;
    cin>>row>>col;
    char meadow[row][col];
    int vis[row][col];
    for(int i=0;i<row;i++){
        fill(vis[i],vis[i]+col,0);
    }
    for(int i=0;i<row;i++){
        for(int j=0;j<col;j++){
            cin>>meadow[i][j];
        }
    }
    int numberoftimes=0;
    if(meadow[0][0]=='.')return 0;
    int dx[4] = {0, 0, -1, 1},dy[4] = {1, -1, 0, 0};          //dx and dy stores the way to get to the adjacent nodes

    vis[0][0]=1;
    int maxweight=-1;
    //priority_queue<tuple<int, int, int>, vector<tuple<int, int, int> >, greater<tuple<int, int, int> > > q; 
    queue<tuple<int,int,int> > q;
                     //pair contains <y_coord, x_coord>
    q.push(make_tuple(1,0, 0));    //push the starting node
    while (!q.empty()) {
        int weight=get<0>(q.front());
        maxweight=max(maxweight,weight);
        int y = get<1>(q.front());
        int x = get<2>(q.front());

        q.pop();
        for (int i = 0; i < 4; i++) {
            int new_y = y + dy[i], new_x = x + dx[i];              //adjacent nodes
            if(new_y>=0 and new_y<row and new_x>=0 and new_x<col and (meadow[new_y][new_x]=='F' or meadow[new_y][new_x]=='R') and vis[new_y][new_x]==0){
                if(meadow[new_y][new_x]==meadow[y][x]){
                    vis[new_y][new_x]=vis[y][x];
                }
                else{
                    vis[new_y][new_x]=vis[y][x]+1;
                }
                q.push(make_tuple(vis[new_y][new_x],new_y,new_x));
            }
            //check if new node is within bounds, not visited and reachable (code for if it is not)
        }

        //cout<<"y: "<<y<<" x: "<<x<<" vis: "<<vis[y][x]<<" currchar: "<<currchar<<" number: "<<number<<"\n";
        
    }
    /*
    for(int i=0;i<row;i++){
        for(int j=0;j<col;j++){
            cout<<vis[i][j]<<" ";
        }
        cout<<"\n";
    }
    */

    cout<<maxweight;
    
}        
        
    

    /*
    for(int i=0;i<row;i++){
        for(int j=0;j<col;j++){
            cout<<vis[i][j]<<" ";
        }
        cout<<"\n";
    }
    */
    //cout<<numberoftimes;

Compilation message (stderr)

tracks.cpp: In function 'int main()':
tracks.cpp:18:9: warning: unused variable 'numberoftimes' [-Wunused-variable]
   18 |     int numberoftimes=0;
      |         ^~~~~~~~~~~~~

• Subtask 1: 3.3333333333333335 / 30
• Subtask 2: 28.4375 / 70