Submission #123206

#	Time	Username	Problem	Language	Result	Execution time	Memory
123206		miguel	Nautilus (BOI19_nautilus)	C++14	66 / 100	17 ms	1400 KiB

nautilus

#include<bits/stdc++.h>
using namespace std;
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define dbg(x) cout << #x << '=' << x << '\n';
#define ll long long
#define sz size()
#define x first
#define y second
#define pi pair <int, int>
#define pii pair <pi, int>
#define vi vector <int>
const ll mod = 1000000007;
//#define int ll
int n, m, ss, ans;
set <pi> mp;
bool t[101][101];
bool dp[102][101][101];
string s;

bool valid(int x, int y){
    if(x>0 && x<=n && y>0 && y<=m && t[x][y]) return 1;
    else return 0;
}

void dfs(int x, int y, int cur){
    if(cur==ss){
        if(valid(x, y)) mp.insert({x, y});
    }
    else{
        char c=s[cur];
        if(c=='?'){
            if(valid(x+1, y)) dfs(x+1, y, cur+1);
            if(valid(x, y+1)) dfs(x, y+1, cur+1);
            if(valid(x-1, y)) dfs(x-1, y, cur+1);
            if(valid(x, y-1)) dfs(x, y-1, cur+1);
        }
        else if(c=='S' && valid(x+1, y)) dfs(x+1, y, cur+1);
        else if(c=='E' && valid(x, y+1)) dfs(x, y+1, cur+1);
        else if(c=='N' && valid(x-1, y)) dfs(x-1, y, cur+1);
        else if(c=='W' && valid(x, y-1)) dfs(x, y-1, cur+1);
    }
}

int32_t main(){
    ios_base :: sync_with_stdio(0); cin.tie(); cout.tie();
    cin>>n>>m>>ss;
    for(int i=1; i<=n; i++){
        for(int j=1; j<=m; j++){
            char c;
            cin>>c;
            if(c=='#') t[i][j]=0;
            else t[i][j]=1;
        }
    }
    cin>>s;
    for(int cur=0; cur<ss; cur++){
        for(int i=1; i<=n; i++){
            for(int j=1; j<=m; j++){
                if(valid(i, j) && (cur==0 || dp[cur][i][j])){
                    int x=i, y=j;
                    char c=s[cur];
                    //cout<<c;
                    if(c=='?'){
                        if(valid(x+1, y)) dp[cur+1][x+1][y]=1, x++;
                        x=i; y=j;
                        if(valid(x, y+1)) dp[cur+1][x][y+1]=1, y++;
                        x=i; y=j;
                        if(valid(x-1, y)) dp[cur+1][x-1][y]=1, x--;
                        x=i; y=j;
                        if(valid(x, y-1)) dp[cur+1][x][y-1]=1, y--;
                    }
                    //else cout<<"x";
                    else if(c=='S'){
                        if(valid(x+1, y)) dp[cur+1][x+1][y]=1, x++;
                    }//else cout<<(c=='W');
                    else if(c=='E'){
                        if(valid(x, y+1)) dp[cur+1][x][y+1]=1, y++;
                    }
                    else if(c=='N'){
                        if(valid(x-1, y)) dp[cur+1][x-1][y]=1, x--;
                    }
                    else if(c=='W'){
                        if(valid(x, y-1)) dp[cur+1][x][y-1]=1, y--;
                    }
                }
            }
        }
    } //cout<<endl;
    for(int i=1; i<=n; i++){
        for(int j=1; j<=m; j++){
            //cout<<dp[1][i][j];
            if(dp[ss][i][j]) ans++;
        }
        //cout<<endl;
    }
    cout<<ans;
}

• Subtask 1: 29 / 29
• Subtask 2: 37 / 37
• Subtask 3: 0 / 34