oj.uz

Submission #341016

# Submission time Handle Problem Language Result Execution time Memory
341016 2020-12-28T22:11:10 Z peuch Mecho (IOI09_mecho) C++17
84 / 100
 264 ms 11264 KB 
#include<bits/stdc++.h>
using namespace std;

const int MAXN = 1010;

int dx[4] = {0, 1, 0, -1};
int dy[4] = {1, 0, -1, 0};

int n, s;
int hx, hy;
int mx, my;
char grid[MAXN][MAXN];
int beeDist[MAXN][MAXN];
int marc[MAXN][MAXN];
int dist[MAXN][MAXN];

void preCalc();
bool test(int temp);
int bb();

int main(){
	scanf("%d %d", &n, &s);
	for(int i = 1; i <= n; i++){
		for(int j = 1; j <= n; j++){
			scanf(" %c", &grid[i][j]);
			if(grid[i][j] == 'D') hx = i, hy = j;
			if(grid[i][j] == 'M') mx = i, my = j;
		}
	}
	preCalc();
	printf("%d\n", bb());
}

void preCalc(){
	queue<int> fila;
	for(int i = 1; i <= n; i++){
		for(int j = 1; j <= n; j++){
			if(grid[i][j] != 'H') beeDist[i][j] = 1e8;
			else{
				marc[i][j] = 1;
				fila.push(i);
				fila.push(j);
			}
		}
	}
	while(!fila.empty()){
		int curx = fila.front();
		fila.pop();
		int cury = fila.front();
		fila.pop();
		for(int i = 0; i < 4; i++){
			int vizx = curx + dx[i];
			int vizy = cury + dy[i];
			if(vizx <= 0 || vizx > n) continue;
			if(vizy <= 0 || vizy > n) continue;
			if(grid[vizx][vizy] == 'T') continue;
			if(grid[vizx][vizy] == 'D') continue;
			if(marc[vizx][vizy]) continue;
			marc[vizx][vizy] = 1;
			beeDist[vizx][vizy] = beeDist[curx][cury] + 1;
			fila.push(vizx);
			fila.push(vizy);
		}
	}
}

bool test(int temp){
	queue<int> fila;
	for(int i = 1; i <= n; i++){
		for(int j = 1; j <= n; j++){
			marc[i][j] = 0;
			dist[i][j] = 0;
		}
	}
	fila.push(mx);
	fila.push(my);
	marc[mx][my] = 1;
	dist[mx][my] = 0;
	while(!fila.empty()){
		int curx = fila.front();
		fila.pop();
		int cury = fila.front();
		fila.pop();
		for(int i = 0; i < 4; i++){
			int vizx = curx + dx[i];
			int vizy = cury + dy[i];
			if(vizx <= 0 || vizx > n) continue;
			if(vizy <= 0 || vizy > n) continue;
			if(grid[vizx][vizy] == 'T') continue;
			if(temp + (dist[curx][cury] + 1) / s >= beeDist[vizx][vizy]) continue;
			if(marc[vizx][vizy]) continue;
			marc[vizx][vizy] = 1;
			dist[vizx][vizy] = dist[curx][cury] + 1;
			fila.push(vizx);
			fila.push(vizy);
		}
	}
	return marc[hx][hy];
}

int bb(){
	int ini = 0, fim = 1e8 + 10;
	if(!test(ini)) return -1;
	while(ini != fim){
		int mid = (ini + fim) >> 1;
		if(ini == fim - 1) mid = fim;
		if(test(mid)) ini = mid;
		else fim = mid - 1;
	}
	return ini;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:22:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   22 |  scanf("%d %d", &n, &s);
      |  ~~~~~^~~~~~~~~~~~~~~~~
mecho.cpp:25:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 |    scanf(" %c", &grid[i][j]);
      |    ~~~~~^~~~~~~~~~~~~~~~~~~~

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 215 ms 11244 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 1 ms 492 KB Output is correct
12 Incorrect 1 ms 1132 KB Output isn't correct
13 Incorrect 1 ms 1004 KB Output isn't correct
14 Correct 1 ms 1132 KB Output is correct
15 Correct 1 ms 620 KB Output is correct
16 Correct 1 ms 620 KB Output is correct
17 Correct 1 ms 620 KB Output is correct
18 Correct 1 ms 620 KB Output is correct
19 Correct 1 ms 748 KB Output is correct
20 Correct 1 ms 748 KB Output is correct
21 Correct 1 ms 876 KB Output is correct
22 Correct 1 ms 876 KB Output is correct
23 Correct 1 ms 1004 KB Output is correct
24 Correct 1 ms 1004 KB Output is correct
25 Correct 1 ms 1132 KB Output is correct
26 Correct 1 ms 1132 KB Output is correct
27 Correct 2 ms 1132 KB Output is correct
28 Correct 2 ms 1132 KB Output is correct
29 Correct 2 ms 1260 KB Output is correct
30 Correct 2 ms 1260 KB Output is correct
31 Correct 2 ms 1260 KB Output is correct
32 Correct 2 ms 1260 KB Output is correct
33 Correct 16 ms 4972 KB Output is correct
34 Correct 17 ms 4972 KB Output is correct
35 Correct 41 ms 4972 KB Output is correct
36 Correct 20 ms 5612 KB Output is correct
37 Correct 22 ms 5612 KB Output is correct
38 Correct 51 ms 5740 KB Output is correct
39 Correct 24 ms 6380 KB Output is correct
40 Correct 26 ms 6380 KB Output is correct
41 Correct 65 ms 6380 KB Output is correct
42 Correct 30 ms 7020 KB Output is correct
43 Correct 31 ms 7020 KB Output is correct
44 Correct 81 ms 7020 KB Output is correct
45 Correct 36 ms 7660 KB Output is correct
46 Correct 38 ms 7660 KB Output is correct
47 Correct 107 ms 7660 KB Output is correct
48 Correct 44 ms 8428 KB Output is correct
49 Correct 48 ms 8556 KB Output is correct
50 Correct 130 ms 8556 KB Output is correct
51 Correct 49 ms 9068 KB Output is correct
52 Correct 52 ms 9068 KB Output is correct
53 Correct 156 ms 9196 KB Output is correct
54 Correct 58 ms 9824 KB Output is correct
55 Correct 60 ms 9836 KB Output is correct
56 Correct 188 ms 9836 KB Output is correct
57 Correct 65 ms 10476 KB Output is correct
58 Correct 74 ms 10476 KB Output is correct
59 Correct 216 ms 10604 KB Output is correct
60 Correct 75 ms 11116 KB Output is correct
61 Correct 78 ms 11116 KB Output is correct
62 Correct 264 ms 11228 KB Output is correct
63 Correct 159 ms 11116 KB Output is correct
64 Correct 227 ms 11244 KB Output is correct
65 Correct 254 ms 10860 KB Output is correct
66 Correct 213 ms 10988 KB Output is correct
67 Correct 72 ms 10988 KB Output is correct
68 Correct 104 ms 10988 KB Output is correct
69 Correct 115 ms 10860 KB Output is correct
70 Correct 120 ms 10988 KB Output is correct
71 Correct 99 ms 10860 KB Output is correct
72 Incorrect 95 ms 10988 KB Output isn't correct
73 Incorrect 135 ms 11248 KB Output isn't correct
74 Correct 166 ms 11116 KB Output is correct
75 Correct 156 ms 11116 KB Output is correct
76 Correct 190 ms 11244 KB Output is correct
77 Correct 166 ms 11116 KB Output is correct
78 Correct 73 ms 11244 KB Output is correct
79 Correct 155 ms 11116 KB Output is correct
80 Correct 154 ms 11116 KB Output is correct
81 Correct 164 ms 11264 KB Output is correct
82 Correct 141 ms 11244 KB Output is correct
83 Correct 183 ms 11144 KB Output is correct
84 Correct 190 ms 11116 KB Output is correct
85 Correct 154 ms 11116 KB Output is correct
86 Correct 173 ms 11244 KB Output is correct
87 Correct 201 ms 11016 KB Output is correct
88 Correct 180 ms 10732 KB Output is correct
89 Correct 196 ms 10860 KB Output is correct
90 Correct 201 ms 10860 KB Output is correct
91 Correct 199 ms 10732 KB Output is correct
92 Correct 181 ms 10860 KB Output is correct