Submission #882842

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
882842	2023-12-03T20:37:57 Z	abhinavshukla408	Mecho (IOI09_mecho)	C++17	84 / 100	343 ms	31232 KB

mecho

#include <iostream>
#include <vector>
#include <set>
#include <string>
#include <unordered_set>
#include <unordered_map>
#include <map>
#include <stack>
#include <queue>
#include <algorithm>
#include <cassert>
#include <math.h>
 
using namespace std;
 
#define endl "\n"
#define int int64_t 
#define pb push_back
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define FOR0(i,a) FOR(i,0,a)
#define FOR1(i,a) for (int i = (1); i <= (a); ++i)
#define TRAV(a,x) for (auto& a: x)

using pii = pair<int,int>;
using vi = vector<int>;
vi dx = {-1,0,1,0};
vi dy = {0,-1,0,1};
const int NMAX=801;
int N;
int S;
pii start={0,0};
pii end2={0,0};

bool f(int k,string grid[NMAX][NMAX],int distBees[NMAX][NMAX]){
	queue<pii> cur;
	cur.push(start);
	int dist[N][N];
	FOR0(i,N){
		FOR0(j,N){
			dist[i][j]=-1;
		}
	}
	dist[start.first][start.second]=0;
	while(!cur.empty()){
		pii curNode=cur.front();
		cur.pop();
		FOR0(i,4){
			int newR=curNode.first+dx[i];
			int newC=curNode.second+dy[i];
			if(newR<0 || newR>=N || newC<0 || newC>=N){continue;}
			if((grid[newR][newC]=="G" || grid[newR][newC]=="D") && dist[newR][newC]==(-1)){
				if((distBees[newR][newC]-k)>((dist[curNode.first][curNode.second]+1)/S)){
					//cout<<newR<<" "<<newC<<endl;
					dist[newR][newC]=dist[curNode.first][curNode.second]+1;
					cur.push({newR,newC});
				}
			}
		}
	}
	// FOR0(i,N){
	// 	FOR0(j,N){
	// 		cout<<dist[i][j]<<" ";
	// 	}
	// 	cout<<endl;
	// }
	bool ans=false;
	FOR0(i,4){
			int newR=end2.first+dx[i];
			int newC=end2.second+dy[i];
			if(newR<0 || newR>=N || newC<0 || newC>=N){continue;}
			if((grid[newR][newC]=="G" || grid[newR][newC]=="D") && dist[newR][newC]!=(-1)){
				
					//cout<<newR<<" "<<newC<<endl;
					ans=true;
				
			}
	}
	return ans;

}

int last_true(int lo, int hi,string grid[NMAX][NMAX],int distBees[NMAX][NMAX]) {
	// if none of the values in the range work, return lo - 1
	lo--;
	while (lo < hi) {
		// find the middle of the current range (rounding up)
		int mid = lo + (hi - lo + 1) / 2;
		if (f(mid,grid,distBees)) {
			// if mid works, then all numbers smaller than mid also work
			lo = mid;
		} else {
			// if mid does not work, greater values would not work either
			hi = mid - 1;
		}
	}
	return lo;
}


int32_t main(){

	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	// cout<<"yo"<<endl;
	// return 0;
	cin>>N>>S;
	string grid[NMAX][NMAX];
	int distBees[NMAX][NMAX];
	
	queue<pii> cur;
	FOR0(r,N){
		string in;
		cin>>in;
		FOR0(c,N){
			distBees[r][c]=-1;
			grid[r][c]=(in.at(c));
			if(grid[r][c]=="H"){
				cur.push({r,c});
				distBees[r][c]=0;
			}
			if(grid[r][c]=="M"){
				start={r,c};
			}
			if(grid[r][c]=="D"){
				end2={r,c};
			}
		}
	}
	// return 0;
	while(!cur.empty()){
		pii curNode=cur.front();
		int curR=curNode.first;
		int curC=curNode.second;
		cur.pop();
		FOR0(i,4){
				int newR=curNode.first+dx[i];
				int newC=curNode.second+dy[i];
				if(newR<0 || newR>=N || newC<0 || newC>=N){continue;}
				if(grid[newR][newC]!="T" && distBees[newR][newC]==(-1)){
					distBees[newR][newC]=distBees[curR][curC]+1;
					cur.push({newR,newC});
				}
		}
	}
	// FOR0(i,N){
	// 	FOR0(j,N){
	// 		cout<<distBees[i][j]<<" ";
	// 	}
	// 	cout<<endl;
	// }
	// cout<<endl;
	// cout<<f(1,grid,distBees)<<endl;
	// return 0;
	int ans=last_true(0,100000000,grid,distBees);
	if(ans==100000000){
		ans=-1;
	}
	cout<<ans<<endl;
	



	return 0;
}

Subtask #1

84.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	17 ms	25436 KB	Output is correct
2	Correct	17 ms	25564 KB	Output is correct
3	Correct	14 ms	25436 KB	Output is correct
4	Correct	14 ms	25436 KB	Output is correct
5	Correct	16 ms	25464 KB	Output is correct
6	Correct	14 ms	25432 KB	Output is correct
7	Correct	188 ms	30804 KB	Output is correct
8	Correct	18 ms	25692 KB	Output is correct
9	Correct	14 ms	25436 KB	Output is correct
10	Correct	16 ms	25316 KB	Output is correct
11	Correct	15 ms	25360 KB	Output is correct
12	Incorrect	14 ms	25432 KB	Output isn't correct
13	Incorrect	15 ms	25432 KB	Output isn't correct
14	Correct	15 ms	25432 KB	Output is correct
15	Correct	14 ms	25436 KB	Output is correct
16	Correct	16 ms	25436 KB	Output is correct
17	Correct	17 ms	25564 KB	Output is correct
18	Correct	17 ms	25436 KB	Output is correct
19	Correct	19 ms	25436 KB	Output is correct
20	Correct	17 ms	25424 KB	Output is correct
21	Correct	15 ms	25436 KB	Output is correct
22	Correct	14 ms	25436 KB	Output is correct
23	Correct	15 ms	25436 KB	Output is correct
24	Correct	15 ms	25436 KB	Output is correct
25	Correct	15 ms	25568 KB	Output is correct
26	Correct	15 ms	25436 KB	Output is correct
27	Correct	14 ms	25432 KB	Output is correct
28	Correct	15 ms	25432 KB	Output is correct
29	Correct	15 ms	25432 KB	Output is correct
30	Correct	15 ms	25436 KB	Output is correct
31	Correct	15 ms	25436 KB	Output is correct
32	Correct	15 ms	25524 KB	Output is correct
33	Correct	22 ms	26328 KB	Output is correct
34	Correct	26 ms	26460 KB	Output is correct
35	Correct	52 ms	26332 KB	Output is correct
36	Correct	30 ms	26708 KB	Output is correct
37	Correct	29 ms	26716 KB	Output is correct
38	Correct	71 ms	26804 KB	Output is correct
39	Correct	29 ms	26972 KB	Output is correct
40	Correct	30 ms	27120 KB	Output is correct
41	Correct	87 ms	27152 KB	Output is correct
42	Correct	33 ms	27484 KB	Output is correct
43	Correct	34 ms	27488 KB	Output is correct
44	Correct	113 ms	27364 KB	Output is correct
45	Correct	34 ms	27928 KB	Output is correct
46	Correct	35 ms	28080 KB	Output is correct
47	Correct	147 ms	27940 KB	Output is correct
48	Correct	38 ms	28500 KB	Output is correct
49	Correct	43 ms	28248 KB	Output is correct
50	Correct	176 ms	28392 KB	Output is correct
51	Correct	40 ms	28756 KB	Output is correct
52	Correct	40 ms	28756 KB	Output is correct
53	Correct	187 ms	28896 KB	Output is correct
54	Correct	46 ms	29264 KB	Output is correct
55	Correct	53 ms	29264 KB	Output is correct
56	Correct	218 ms	29264 KB	Output is correct
57	Correct	53 ms	29952 KB	Output is correct
58	Correct	55 ms	29848 KB	Output is correct
59	Correct	273 ms	29988 KB	Output is correct
60	Correct	57 ms	30396 KB	Output is correct
61	Correct	70 ms	30548 KB	Output is correct
62	Correct	336 ms	30448 KB	Output is correct
63	Correct	215 ms	30584 KB	Output is correct
64	Correct	271 ms	30548 KB	Output is correct
65	Correct	343 ms	30800 KB	Output is correct
66	Correct	257 ms	30584 KB	Output is correct
67	Correct	261 ms	30580 KB	Output is correct
68	Correct	103 ms	30492 KB	Output is correct
69	Correct	111 ms	30488 KB	Output is correct
70	Correct	101 ms	30640 KB	Output is correct
71	Correct	85 ms	30632 KB	Output is correct
72	Incorrect	78 ms	30488 KB	Output isn't correct
73	Incorrect	103 ms	30924 KB	Output isn't correct
74	Correct	138 ms	30936 KB	Output is correct
75	Correct	146 ms	30992 KB	Output is correct
76	Correct	160 ms	31088 KB	Output is correct
77	Correct	145 ms	31060 KB	Output is correct
78	Correct	177 ms	31232 KB	Output is correct
79	Correct	139 ms	31060 KB	Output is correct
80	Correct	143 ms	30984 KB	Output is correct
81	Correct	174 ms	31084 KB	Output is correct
82	Correct	164 ms	31056 KB	Output is correct
83	Correct	165 ms	30800 KB	Output is correct
84	Correct	162 ms	31000 KB	Output is correct
85	Correct	150 ms	30996 KB	Output is correct
86	Correct	183 ms	30864 KB	Output is correct
87	Correct	199 ms	30804 KB	Output is correct
88	Correct	168 ms	30804 KB	Output is correct
89	Correct	207 ms	30804 KB	Output is correct
90	Correct	183 ms	30800 KB	Output is correct
91	Correct	230 ms	30968 KB	Output is correct
92	Correct	192 ms	30756 KB	Output is correct