# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
975990 | Br3ad | Mecho (IOI09_mecho) | C++17 | 9 ms | 856 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <iostream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <functional>
#include <cstring>
#include <string>
#include <cmath>
#include <vector>
#include <queue>
#include <stack>
#include <set>
#include <map>
using namespace std;
#define ll long long
#define ull unsigned long long
#define f first
#define s second
#define PF push_front
#define PB push_back
#define MP make_pair
#define max(a, b) ((a > b)? a : b)
#define min(a, b) ((a < b)? a : b)
#define max3(a, b, c) max(max(a, b), c)
#define min3(a, b, c) min(min(a, b), c)
const int N = 8e1 + 5;
const int M = 1e9 + 7;
const int inf = 0x3f3f3f3f;
const ll int INF = 1e18;
const int xMove[4] = {0, 1, 0, -1};
const int yMove[4] = {1, 0, -1, 0};
int bin(int l, int r, function<bool(int)> f){
while(l < r){
int mid = l + (r - l + 1)/2;
if(f(mid)){
l = mid;
}else {
r = mid - 1;
}
}
return r;
}
int main(){
ios::sync_with_stdio(false);
cin.tie(NULL);
// ifstream cin();
// ofstream cout();
pair<int, int> ini;
char c[N][N];
int n, step;
cin >> n >> step;
for(int i = 0; i < n; i++){
for(int j = 0; j < n; j++){
cin >> c[i][j];
if(c[i][j] == 'M') ini = MP(i, j);
}
}
queue<pair<int, int>> bee;
bool vis_bee[N][N]{false};
int stepBee[N][N]{0};
memset(stepBee, inf, sizeof(stepBee));
for(int i = 0; i < n; i++){
for(int j = 0; j < n; j++){
if(c[i][j] == 'H'){
bee.push(MP(i, j));
vis_bee[i][j] = true;
stepBee[i][j] = 0;
}
}
}
while(!bee.empty()){
auto [x, y] = bee.front();
bee.pop();
for(int i = 0; i < 4; i++){
int new_x = x + xMove[i];
int new_y = y + yMove[i];
if(new_x < 0 || new_x >= n || new_y < 0 || new_y >= n) continue;
if(c[new_x][new_y] == 'T' || c[new_x][new_y] == 'D') continue;
if(vis_bee[new_x][new_y]) continue;
vis_bee[new_x][new_y] = true;
stepBee[new_x][new_y] = stepBee[x][y] + 1;
bee.push(MP(new_x, new_y));
}
}
bool vis_bear[N][N]{false};
int stepBear[N][N]{0};
int ans = bin(0, N*N, [&](int time_offset){
// Initialize
memset(vis_bear, false, sizeof(vis_bear));
memset(stepBear, 0, sizeof(stepBear));
queue<pair<int, int>> bear;
bear.push(ini);
vis_bear[ini.f][ini.s] = true;
while(!bear.empty()){
auto [x, y] = bear.front();
bear.pop();
if(c[x][y] == 'D') return true;
int cur_time = (stepBear[x][y])/step + time_offset;
for(int i = 0; i < 4; i++){
int new_x = x + xMove[i];
int new_y = y + yMove[i];
if(new_x < 0 || new_x >= n || new_y < 0 || new_y >= n) continue;
if(c[new_x][new_y] == 'T' || vis_bear[new_x][new_y]) continue;
if(cur_time >= stepBee[new_x][new_y]) continue;
vis_bear[new_x][new_y] = true;
stepBear[new_x][new_y] = stepBear[x][y] + 1;
bear.push(MP(new_x, new_y));
}
}
return false;
});
cout << ans << endl;
}
# | Verdict | Execution time | Memory | Grader output |
---|---|---|---|---|
Fetching results... |