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Submission #341018

# Submission time Handle Problem Language Result Execution time Memory
341018 2020-12-28T22:15:23 Z peuch Mecho (IOI09_mecho) C++17
84 / 100
 433 ms 27040 KB 
#include<bits/stdc++.h>
using namespace std;

const int MAXN = 10010;

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

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

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

int main(){
	scanf("%d %lld", &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("%lld\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] = 2e18;
			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(long long 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];
}

long long bb(){
	long long ini = 0, fim = 1e18 + 10;
	if(!test(ini)) return -1;
	while(ini != fim){
		long long 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:23:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   23 |  scanf("%d %lld", &n, &s);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~
mecho.cpp:26:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   26 |    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 492 KB Output is correct
5 Correct 1 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 359 ms 26860 KB Output is correct
8 Correct 1 ms 620 KB Output is correct
9 Correct 1 ms 620 KB Output is correct
10 Correct 1 ms 620 KB Output is correct
11 Correct 1 ms 620 KB Output is correct
12 Incorrect 2 ms 1388 KB Output isn't correct
13 Incorrect 1 ms 1260 KB Output isn't correct
14 Correct 1 ms 1388 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 748 KB Output is correct
19 Correct 1 ms 876 KB Output is correct
20 Correct 1 ms 876 KB Output is correct
21 Correct 1 ms 1004 KB Output is correct
22 Correct 1 ms 1004 KB Output is correct
23 Correct 1 ms 1260 KB Output is correct
24 Correct 1 ms 1260 KB Output is correct
25 Correct 2 ms 1388 KB Output is correct
26 Correct 2 ms 1388 KB Output is correct
27 Correct 2 ms 1516 KB Output is correct
28 Correct 2 ms 1516 KB Output is correct
29 Correct 2 ms 1644 KB Output is correct
30 Correct 2 ms 1644 KB Output is correct
31 Correct 2 ms 1644 KB Output is correct
32 Correct 2 ms 1644 KB Output is correct
33 Correct 24 ms 8556 KB Output is correct
34 Correct 25 ms 8556 KB Output is correct
35 Correct 49 ms 8556 KB Output is correct
36 Correct 29 ms 10220 KB Output is correct
37 Correct 30 ms 10220 KB Output is correct
38 Correct 68 ms 10220 KB Output is correct
39 Correct 38 ms 11884 KB Output is correct
40 Correct 41 ms 11884 KB Output is correct
41 Correct 94 ms 12012 KB Output is correct
42 Correct 44 ms 13680 KB Output is correct
43 Correct 46 ms 13676 KB Output is correct
44 Correct 126 ms 13676 KB Output is correct
45 Correct 56 ms 15596 KB Output is correct
46 Correct 56 ms 15596 KB Output is correct
47 Correct 154 ms 15596 KB Output is correct
48 Correct 65 ms 17516 KB Output is correct
49 Correct 72 ms 17516 KB Output is correct
50 Correct 198 ms 17724 KB Output is correct
51 Correct 79 ms 19692 KB Output is correct
52 Correct 87 ms 19820 KB Output is correct
53 Correct 242 ms 19840 KB Output is correct
54 Correct 100 ms 21868 KB Output is correct
55 Correct 100 ms 21868 KB Output is correct
56 Correct 309 ms 21996 KB Output is correct
57 Correct 118 ms 24300 KB Output is correct
58 Correct 123 ms 24172 KB Output is correct
59 Correct 358 ms 24172 KB Output is correct
60 Correct 146 ms 26604 KB Output is correct
61 Correct 145 ms 26604 KB Output is correct
62 Correct 433 ms 26732 KB Output is correct
63 Correct 248 ms 26732 KB Output is correct
64 Correct 428 ms 26624 KB Output is correct
65 Correct 355 ms 26732 KB Output is correct
66 Correct 278 ms 26604 KB Output is correct
67 Correct 85 ms 26604 KB Output is correct
68 Correct 177 ms 26732 KB Output is correct
69 Correct 174 ms 26604 KB Output is correct
70 Correct 165 ms 26604 KB Output is correct
71 Correct 166 ms 26732 KB Output is correct
72 Incorrect 165 ms 26604 KB Output isn't correct
73 Incorrect 202 ms 26860 KB Output isn't correct
74 Correct 281 ms 27040 KB Output is correct
75 Correct 274 ms 26988 KB Output is correct
76 Correct 249 ms 26988 KB Output is correct
77 Correct 258 ms 26860 KB Output is correct
78 Correct 99 ms 26988 KB Output is correct
79 Correct 255 ms 26988 KB Output is correct
80 Correct 241 ms 26988 KB Output is correct
81 Correct 268 ms 26988 KB Output is correct
82 Correct 241 ms 26880 KB Output is correct
83 Correct 283 ms 26860 KB Output is correct
84 Correct 293 ms 26732 KB Output is correct
85 Correct 292 ms 26860 KB Output is correct
86 Correct 287 ms 26732 KB Output is correct
87 Correct 264 ms 26732 KB Output is correct
88 Correct 313 ms 26732 KB Output is correct
89 Correct 342 ms 26732 KB Output is correct
90 Correct 342 ms 26732 KB Output is correct
91 Correct 304 ms 26732 KB Output is correct
92 Correct 344 ms 26732 KB Output is correct