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Submission #438033

# Submission time Handle Problem Language Result Execution time Memory
438033 2021-06-27T13:00:03 Z adamjinwei Mecho (IOI09_mecho) C++14
100 / 100
 252 ms 12880 KB 
#include <bits/stdc++.h>
#define inf 1000000007
#define mod 1000000007
#define rnd() rand_num()
#define bigrnd() dis(rand_num)
//#pragma GCC optimize("Ofast","inline","-ffast-math")
//#pragma GCC target("avx,sse2,sse3,sse4,mmx")
#define int long long
using namespace std;
unsigned sed=std::chrono::system_clock::now().time_since_epoch().count();
mt19937 rand_num(sed);
uniform_int_distribution<long long> dis(0,inf);
template <typename T> void read(T &x){
	x=0;char ch=getchar();int fh=1;
	while (ch<'0'||ch>'9'){if (ch=='-')fh=-1;ch=getchar();}
	while (ch>='0'&&ch<='9')x=x*10+ch-'0',ch=getchar();
	x*=fh;
}
template <typename T> void write(T x) {
	if (x<0) x=-x,putchar('-');
	if (x>9) write(x/10);
	putchar(x%10+'0');
}
template <typename T> void writeln(T x) {
	write(x);
	puts("");
}
const int dx[]={-1,0,1,0},dy[]={0,-1,0,1};
int n,s;
char mp[805][1605];
int bee[805][805];
int bear[805][805];
bool check(int mid)
{
	memset(bear,0x3f,sizeof(bear));
	queue<pair<int,int>> q;
	for(int i=1;i<=n;++i)
		for(int j=1;j<=n;++j)
			if(mp[i][j]=='M')
			{
				if(mid*s>=bee[i][j]) return false;
				bear[i][j]=mid*s;
				q.push(make_pair(i,j));
			}
	while(!q.empty())
	{
		pair<int,int> p=q.front();
		q.pop();
		if(mp[p.first][p.second]=='D') return true;
		for(int d=0;d<4;++d)
		{
			int xx=p.first+dx[d],yy=p.second+dy[d];
			if(xx>=1&&xx<=n&&yy>=1&&yy<=n&&(mp[xx][yy]=='G'||mp[xx][yy]=='D')&&bear[p.first][p.second]+1<bee[xx][yy]&&bear[xx][yy]>bear[p.first][p.second]+1)
			{
				bear[xx][yy]=bear[p.first][p.second]+1;
				q.push(make_pair(xx,yy));
			}
		}
	}
	return false;
}
signed main()
{
	//freopen(".in","r",stdin);
	//freopen(".out","w",stdout);
	read(n);read(s);
	for(int i=1;i<=n;++i)
		scanf("%s",mp[i]+1);
	memset(bee,0x3f,sizeof(bee));
	queue<pair<int,int>> q;
	for(int i=1;i<=n;++i)
		for(int j=1;j<=n;++j)
			if(mp[i][j]=='H')
			{
				bee[i][j]=0;
				q.push(make_pair(i,j));
			}
	while(!q.empty())
	{
		pair<int,int> p=q.front();
		q.pop();
		for(int d=0;d<4;++d)
		{
			int xx=p.first+dx[d],yy=p.second+dy[d];
			if(xx>=1&&xx<=n&&yy>=1&&yy<=n&&(mp[xx][yy]=='G'||mp[xx][yy]=='M')&&bee[xx][yy]>bee[p.first][p.second]+s)
			{
				bee[xx][yy]=bee[p.first][p.second]+s;
				q.push(make_pair(xx,yy));
			}
		}
	}
	int l=0,r=inf;
	while(l<r)
	{
		int mid=l+r+1>>1;
		if(check(mid)) l=mid;
		else r=mid-1;
	}
	if(check(l)) writeln(l);
	else puts("-1");
	return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:95:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   95 |   int mid=l+r+1>>1;
      |           ~~~^~
mecho.cpp:68:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |   scanf("%s",mp[i]+1);
      |   ~~~~~^~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 10484 KB Output is correct
2 Correct 18 ms 10444 KB Output is correct
3 Correct 14 ms 10452 KB Output is correct
4 Correct 14 ms 10372 KB Output is correct
5 Correct 14 ms 10444 KB Output is correct
6 Correct 14 ms 10464 KB Output is correct
7 Correct 220 ms 12452 KB Output is correct
8 Correct 15 ms 10444 KB Output is correct
9 Correct 15 ms 10468 KB Output is correct
10 Correct 12 ms 10444 KB Output is correct
11 Correct 13 ms 10444 KB Output is correct
12 Correct 14 ms 10548 KB Output is correct
13 Correct 17 ms 10536 KB Output is correct
14 Correct 18 ms 10444 KB Output is correct
15 Correct 13 ms 10444 KB Output is correct
16 Correct 17 ms 10480 KB Output is correct
17 Correct 13 ms 10484 KB Output is correct
18 Correct 15 ms 10444 KB Output is correct
19 Correct 14 ms 10444 KB Output is correct
20 Correct 14 ms 10496 KB Output is correct
21 Correct 13 ms 10512 KB Output is correct
22 Correct 13 ms 10444 KB Output is correct
23 Correct 14 ms 10444 KB Output is correct
24 Correct 14 ms 10528 KB Output is correct
25 Correct 14 ms 10544 KB Output is correct
26 Correct 15 ms 10544 KB Output is correct
27 Correct 13 ms 10552 KB Output is correct
28 Correct 13 ms 10444 KB Output is correct
29 Correct 15 ms 10444 KB Output is correct
30 Correct 13 ms 10544 KB Output is correct
31 Correct 12 ms 10444 KB Output is correct
32 Correct 16 ms 10548 KB Output is correct
33 Correct 24 ms 11108 KB Output is correct
34 Correct 18 ms 11084 KB Output is correct
35 Correct 46 ms 11084 KB Output is correct
36 Correct 18 ms 11156 KB Output is correct
37 Correct 26 ms 11212 KB Output is correct
38 Correct 72 ms 11220 KB Output is correct
39 Correct 22 ms 11340 KB Output is correct
40 Correct 31 ms 11272 KB Output is correct
41 Correct 86 ms 11340 KB Output is correct
42 Correct 25 ms 11468 KB Output is correct
43 Correct 51 ms 11424 KB Output is correct
44 Correct 108 ms 11476 KB Output is correct
45 Correct 24 ms 11492 KB Output is correct
46 Correct 27 ms 11596 KB Output is correct
47 Correct 116 ms 11588 KB Output is correct
48 Correct 25 ms 11724 KB Output is correct
49 Correct 33 ms 11724 KB Output is correct
50 Correct 138 ms 11740 KB Output is correct
51 Correct 25 ms 11852 KB Output is correct
52 Correct 32 ms 11872 KB Output is correct
53 Correct 162 ms 11852 KB Output is correct
54 Correct 29 ms 11980 KB Output is correct
55 Correct 35 ms 11948 KB Output is correct
56 Correct 209 ms 11924 KB Output is correct
57 Correct 28 ms 12108 KB Output is correct
58 Correct 35 ms 12108 KB Output is correct
59 Correct 237 ms 12228 KB Output is correct
60 Correct 35 ms 12228 KB Output is correct
61 Correct 47 ms 12252 KB Output is correct
62 Correct 252 ms 12292 KB Output is correct
63 Correct 154 ms 12364 KB Output is correct
64 Correct 246 ms 12316 KB Output is correct
65 Correct 246 ms 12380 KB Output is correct
66 Correct 188 ms 12368 KB Output is correct
67 Correct 156 ms 12316 KB Output is correct
68 Correct 114 ms 12368 KB Output is correct
69 Correct 82 ms 12440 KB Output is correct
70 Correct 76 ms 12484 KB Output is correct
71 Correct 62 ms 12308 KB Output is correct
72 Correct 58 ms 12356 KB Output is correct
73 Correct 65 ms 12748 KB Output is correct
74 Correct 101 ms 12792 KB Output is correct
75 Correct 114 ms 12864 KB Output is correct
76 Correct 123 ms 12880 KB Output is correct
77 Correct 145 ms 12868 KB Output is correct
78 Correct 133 ms 12744 KB Output is correct
79 Correct 124 ms 12808 KB Output is correct
80 Correct 119 ms 12740 KB Output is correct
81 Correct 165 ms 12724 KB Output is correct
82 Correct 146 ms 12816 KB Output is correct
83 Correct 203 ms 12668 KB Output is correct
84 Correct 170 ms 12780 KB Output is correct
85 Correct 196 ms 12740 KB Output is correct
86 Correct 207 ms 12728 KB Output is correct
87 Correct 214 ms 12780 KB Output is correct
88 Correct 175 ms 12560 KB Output is correct
89 Correct 201 ms 12632 KB Output is correct
90 Correct 231 ms 12640 KB Output is correct
91 Correct 208 ms 12632 KB Output is correct
92 Correct 186 ms 12636 KB Output is correct