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Submission #341015

# Submission time Handle Problem Language Result Execution time Memory
341015 2020-12-28T22:09:01 Z peuch Mecho (IOI09_mecho) C++17
64 / 100
 288 ms 11656 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 = 1e5 + 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
64.0 / 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 187 ms 11372 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 748 KB Output is correct
18 Correct 1 ms 620 KB Output is correct
19 Correct 1 ms 768 KB Output is correct
20 Correct 1 ms 748 KB Output is correct
21 Correct 1 ms 888 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 2 ms 1132 KB Output is correct
27 Correct 2 ms 1152 KB Output is correct
28 Correct 1 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 1408 KB Output is correct
33 Correct 14 ms 4972 KB Output is correct
34 Correct 17 ms 5100 KB Output is correct
35 Correct 37 ms 4972 KB Output is correct
36 Correct 18 ms 5632 KB Output is correct
37 Correct 20 ms 5612 KB Output is correct
38 Correct 54 ms 5612 KB Output is correct
39 Incorrect 24 ms 6380 KB Output isn't correct
40 Correct 25 ms 6380 KB Output is correct
41 Correct 66 ms 6380 KB Output is correct
42 Incorrect 34 ms 7020 KB Output isn't correct
43 Correct 29 ms 7020 KB Output is correct
44 Correct 90 ms 7020 KB Output is correct
45 Incorrect 47 ms 7660 KB Output isn't correct
46 Correct 36 ms 7788 KB Output is correct
47 Correct 105 ms 7744 KB Output is correct
48 Incorrect 55 ms 8428 KB Output isn't correct
49 Correct 42 ms 8428 KB Output is correct
50 Correct 132 ms 8428 KB Output is correct
51 Incorrect 69 ms 9196 KB Output isn't correct
52 Incorrect 55 ms 9068 KB Output isn't correct
53 Correct 162 ms 9196 KB Output is correct
54 Incorrect 81 ms 9836 KB Output isn't correct
55 Incorrect 77 ms 9964 KB Output isn't correct
56 Correct 187 ms 9964 KB Output is correct
57 Incorrect 97 ms 10604 KB Output isn't correct
58 Incorrect 97 ms 10656 KB Output isn't correct
59 Correct 222 ms 10732 KB Output is correct
60 Incorrect 109 ms 11244 KB Output isn't correct
61 Incorrect 123 ms 11244 KB Output isn't correct
62 Correct 288 ms 11372 KB Output is correct
63 Correct 163 ms 11320 KB Output is correct
64 Correct 249 ms 11472 KB Output is correct
65 Correct 275 ms 11500 KB Output is correct
66 Correct 211 ms 11244 KB Output is correct
67 Correct 74 ms 11244 KB Output is correct
68 Correct 109 ms 11244 KB Output is correct
69 Correct 108 ms 11244 KB Output is correct
70 Correct 89 ms 11244 KB Output is correct
71 Correct 92 ms 11244 KB Output is correct
72 Incorrect 92 ms 11372 KB Output isn't correct
73 Incorrect 107 ms 11628 KB Output isn't correct
74 Correct 161 ms 11628 KB Output is correct
75 Correct 165 ms 11628 KB Output is correct
76 Correct 154 ms 11628 KB Output is correct
77 Correct 151 ms 11628 KB Output is correct
78 Correct 73 ms 11500 KB Output is correct
79 Correct 161 ms 11628 KB Output is correct
80 Correct 134 ms 11500 KB Output is correct
81 Correct 146 ms 11500 KB Output is correct
82 Correct 132 ms 11500 KB Output is correct
83 Correct 170 ms 11656 KB Output is correct
84 Correct 187 ms 11628 KB Output is correct
85 Correct 184 ms 11500 KB Output is correct
86 Correct 156 ms 11500 KB Output is correct
87 Correct 186 ms 11628 KB Output is correct
88 Correct 176 ms 11500 KB Output is correct
89 Correct 190 ms 11372 KB Output is correct
90 Correct 181 ms 11500 KB Output is correct
91 Correct 193 ms 11372 KB Output is correct
92 Correct 195 ms 11372 KB Output is correct