Submission #736323

#	Time	Username	Problem	Language	Result	Execution time	Memory
736323		Cookie	Maze (JOI23_ho_t3)	C++14	0 / 100	1 ms	340 KiB

Main

#include<bits/stdc++.h>
#include<fstream>
using namespace std;
ifstream fin("WINTER.inp");
ofstream fout("WINTER.out");
 
#define ll long long
#define pb push_back
#define forr(i, a, b) for(int i = a; i < b; i++)
#define dorr(i, a, b) for(int i = a; i >= b; i--)
#define ld long double
#define vt vector
#include<fstream>
#define fi first
#define se second
#define pll pair<ll, ll>
#define pii pair<int, int>
const ld PI = 3.14159265359;
const int x[4] = {1, -1, 0, 0};
const int y[4] = {0, 0, 1, -1};
const ll mod = 1e9 + 7;
const int mxn = 5e5, mxm = 1e5, sq = 400;
const int base = (1 << 18);
const ll inf = 1e9;
const ld pre = 1e-6;
int r, c, n, sti, stj, eni, enj;
vt<vt<char>>a;
vt<vt<int>>d;
vt<int>lrow, rrow, lcol, rcol;
bool inside(int i, int j){
    return(i >= 1 && j >= 1 && i <= r && j <= c);
}
signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> r >> c >> n;
    a.resize(r + 1, vt<char>(c + 1));
    d.resize(r + 1, vt<int>(c + 1));
    lrow.resize(r + 1); rrow.resize(r + 1); lcol.resize(c + 1); rcol.resize(c + 1);
    cin >> sti >> stj >> eni >> enj;
    forr(i, 1, r + 1){
        lrow[i] = c; rrow[i] = 1;
        forr(j, 1, c + 1){
            lcol[j] = r; rcol[j] = 1;
            cin >> a[i][j]; d[i][j] = 1e9;
        }
    }
    deque<pair<int, int>>dq; dq.pb({sti, stj});
    d[sti][stj] = 0;
    while(!dq.empty()){
        auto [i, j] = dq.front(); dq.pop_front();
        if(a[i][j] == '.'){
        for(int t = 0; t < 4; t++){
            int nwi = i + x[t], nwj = j + y[t];
            if(inside(nwi, nwj)){
                if(d[nwi][nwj] > d[i][j]){
                    d[nwi][nwj] = d[i][j];
                    dq.push_front({nwi, nwj});
                }
            }
        }
        }
        for(auto ii: {i - n, i + n}){
           
            if(!inside(ii, 1))continue;
            int le = max(1, j - n + 1), ri = min(c, j + n - 1);
            if(lrow[ii] <= le)le = max(le, rrow[ii]);
            if(rrow[ii] >= ri)ri = min(ri, lrow[ii]);
            for(int jj = le; jj <= ri; jj++){
                if(d[ii][jj] > d[i][j] + 1){
                        d[ii][jj] = d[i][j] + 1;
                        dq.push_back({ii, jj});
                }
            }
            lrow[ii] = min(le, lrow[ii]); rrow[ii] = max(rrow[ii], ri);
        }
        for(auto jj : {j - n, j + n}){
            if(!inside(1, jj))continue;
            int le = max(1, i - n + 1), ri = min(r, i + n - 1);
            if(lcol[jj] <= le)le = max(le, rcol[jj]);
            if(rcol[jj] >= ri)ri = min(ri, lcol[jj]);
            for(int ii = le; ii <= ri; ii++){
                if(d[ii][jj] > d[i][j] + 1){
                        d[ii][jj] = d[i][j] + 1;
                        dq.push_back({ii, jj});
                }
            }
            lcol[jj] = min(le, lcol[jj]); rcol[jj] = max(rcol[jj], ri);
        }
    }
    int ans = 1e9;
    for(int i = eni - n + 1; i <= eni + n - 1; i++){
        for(int j = enj - n + 1; j  <= enj + n - 1; j++){
            if(inside(i, j)){
                
                ans = min(ans, d[i][j] + 1);
            }
        }
    }
    ans = min(ans, d[eni][enj]);
    cout << ans << "\n";
    
    return(0);
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:50:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   50 |         auto [i, j] = dq.front(); dq.pop_front();
      |              ^

• Subtask 1: 0 / 8
• Subtask 2: 0 / 19
• Subtask 3: 0 / 16
• Subtask 4: 0 / 19
• Subtask 5: 0 / 5
• Subtask 6: 0 / 19
• Subtask 7: 0 / 8
• Subtask 8: 0 / 6