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Submission #341019

# Submission time Handle Problem Language Result Execution time Memory
341019 2020-12-28T22:16:43 Z peuch Mecho (IOI09_mecho) C++17
69 / 100
 435 ms 27000 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 = 1, 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
69.0 / 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 Incorrect 1 ms 492 KB Output isn't correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 363 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 2 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 22 ms 8556 KB Output is correct
34 Correct 23 ms 8556 KB Output is correct
35 Correct 51 ms 8684 KB Output is correct
36 Correct 31 ms 10220 KB Output is correct
37 Correct 31 ms 10220 KB Output is correct
38 Correct 68 ms 10220 KB Output is correct
39 Correct 37 ms 11884 KB Output is correct
40 Correct 39 ms 11904 KB Output is correct
41 Correct 91 ms 11884 KB Output is correct
42 Correct 45 ms 13676 KB Output is correct
43 Correct 47 ms 13676 KB Output is correct
44 Correct 119 ms 13676 KB Output is correct
45 Correct 55 ms 15596 KB Output is correct
46 Correct 56 ms 15596 KB Output is correct
47 Correct 156 ms 15680 KB Output is correct
48 Correct 67 ms 17536 KB Output is correct
49 Correct 68 ms 17516 KB Output is correct
50 Correct 198 ms 17516 KB Output is correct
51 Correct 85 ms 19820 KB Output is correct
52 Correct 86 ms 19692 KB Output is correct
53 Correct 243 ms 19692 KB Output is correct
54 Correct 98 ms 21868 KB Output is correct
55 Correct 107 ms 21868 KB Output is correct
56 Correct 306 ms 21996 KB Output is correct
57 Correct 119 ms 24320 KB Output is correct
58 Correct 127 ms 24172 KB Output is correct
59 Correct 362 ms 24300 KB Output is correct
60 Correct 141 ms 26764 KB Output is correct
61 Correct 143 ms 26604 KB Output is correct
62 Correct 435 ms 26604 KB Output is correct
63 Incorrect 87 ms 26604 KB Output isn't correct
64 Correct 416 ms 26860 KB Output is correct
65 Correct 335 ms 26604 KB Output is correct
66 Correct 312 ms 26732 KB Output is correct
67 Correct 86 ms 26604 KB Output is correct
68 Incorrect 89 ms 26604 KB Output isn't correct
69 Correct 196 ms 26732 KB Output is correct
70 Correct 161 ms 26732 KB Output is correct
71 Correct 167 ms 26732 KB Output is correct
72 Incorrect 167 ms 26604 KB Output isn't correct
73 Incorrect 207 ms 26848 KB Output isn't correct
74 Correct 290 ms 26912 KB Output is correct
75 Correct 266 ms 26860 KB Output is correct
76 Correct 241 ms 26860 KB Output is correct
77 Correct 253 ms 26860 KB Output is correct
78 Correct 103 ms 27000 KB Output is correct
79 Correct 255 ms 26860 KB Output is correct
80 Correct 244 ms 26860 KB Output is correct
81 Correct 253 ms 26860 KB Output is correct
82 Correct 235 ms 26860 KB Output is correct
83 Incorrect 118 ms 26732 KB Output isn't correct
84 Correct 295 ms 26732 KB Output is correct
85 Correct 289 ms 26860 KB Output is correct
86 Correct 293 ms 26732 KB Output is correct
87 Correct 269 ms 26988 KB Output is correct
88 Incorrect 103 ms 26732 KB Output isn't correct
89 Correct 329 ms 26732 KB Output is correct
90 Correct 331 ms 26792 KB Output is correct
91 Correct 326 ms 26732 KB Output is correct
92 Correct 335 ms 26732 KB Output is correct