oj.uz

Submission #341028

# Submission time Handle Problem Language Result Execution time Memory
341028 2020-12-28T22:34:59 Z peuch Mecho (IOI09_mecho) C++17
84 / 100
 255 ms 10988 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] = 2e8;
			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 0 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 207 ms 10732 KB Output is correct
8 Correct 1 ms 512 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 1024 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 1 ms 1132 KB Output is correct
29 Correct 2 ms 1260 KB Output is correct
30 Correct 2 ms 1280 KB Output is correct
31 Correct 2 ms 1272 KB Output is correct
32 Correct 2 ms 1260 KB Output is correct
33 Correct 15 ms 4844 KB Output is correct
34 Correct 17 ms 4844 KB Output is correct
35 Correct 38 ms 4844 KB Output is correct
36 Correct 20 ms 5484 KB Output is correct
37 Correct 23 ms 5484 KB Output is correct
38 Correct 52 ms 5484 KB Output is correct
39 Correct 26 ms 6144 KB Output is correct
40 Correct 26 ms 6124 KB Output is correct
41 Correct 67 ms 6124 KB Output is correct
42 Correct 30 ms 6764 KB Output is correct
43 Correct 36 ms 6764 KB Output is correct
44 Correct 81 ms 6764 KB Output is correct
45 Correct 36 ms 7404 KB Output is correct
46 Correct 38 ms 7404 KB Output is correct
47 Correct 108 ms 7532 KB Output is correct
48 Correct 42 ms 8044 KB Output is correct
49 Correct 45 ms 8044 KB Output is correct
50 Correct 128 ms 8044 KB Output is correct
51 Correct 48 ms 8684 KB Output is correct
52 Correct 51 ms 8684 KB Output is correct
53 Correct 157 ms 8724 KB Output is correct
54 Correct 57 ms 9324 KB Output is correct
55 Correct 63 ms 9344 KB Output is correct
56 Correct 178 ms 9324 KB Output is correct
57 Correct 64 ms 9964 KB Output is correct
58 Correct 71 ms 9964 KB Output is correct
59 Correct 213 ms 10092 KB Output is correct
60 Correct 74 ms 10604 KB Output is correct
61 Correct 80 ms 10604 KB Output is correct
62 Correct 255 ms 10604 KB Output is correct
63 Correct 161 ms 10860 KB Output is correct
64 Correct 229 ms 10604 KB Output is correct
65 Correct 247 ms 10988 KB Output is correct
66 Correct 207 ms 10604 KB Output is correct
67 Correct 73 ms 10732 KB Output is correct
68 Correct 103 ms 10604 KB Output is correct
69 Correct 114 ms 10732 KB Output is correct
70 Correct 101 ms 10604 KB Output is correct
71 Correct 101 ms 10604 KB Output is correct
72 Incorrect 94 ms 10672 KB Output isn't correct
73 Incorrect 123 ms 10860 KB Output isn't correct
74 Correct 162 ms 10860 KB Output is correct
75 Correct 153 ms 10860 KB Output is correct
76 Correct 145 ms 10860 KB Output is correct
77 Correct 157 ms 10988 KB Output is correct
78 Correct 71 ms 10860 KB Output is correct
79 Correct 153 ms 10860 KB Output is correct
80 Correct 148 ms 10860 KB Output is correct
81 Correct 161 ms 10860 KB Output is correct
82 Correct 141 ms 10860 KB Output is correct
83 Correct 156 ms 10888 KB Output is correct
84 Correct 187 ms 10904 KB Output is correct
85 Correct 154 ms 10860 KB Output is correct
86 Correct 168 ms 10888 KB Output is correct
87 Correct 184 ms 10860 KB Output is correct
88 Correct 167 ms 10732 KB Output is correct
89 Correct 199 ms 10860 KB Output is correct
90 Correct 192 ms 10732 KB Output is correct
91 Correct 194 ms 10732 KB Output is correct
92 Correct 187 ms 10732 KB Output is correct