답안 #335505

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
335505	2020-12-12T21:24:32 Z	DavidDamian	Mecho (IOI09_mecho)	C++11	76 / 100	250 ms	8940 KB

mecho

#include <bits/stdc++.h>
using namespace std;
typedef pair<int,int> pii;
char forest[805][805];
int n,s;
queue<pii> Q;
int timeBees[805][805];
int dx[4]={1,-1,0,0};
int dy[4]{0,0,1,-1};
void bfsBees(vector<pii> source){
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            timeBees[i][j]=INT_MAX;
        }
    }
    for(pii u: source){
        timeBees[u.first][u.second]=0;
        Q.push(u);
    }
    while(!Q.empty()){
        pii u=Q.front();
        Q.pop();
        for(int mov=0;mov<4;mov++){
            int i=u.first+dx[mov];
            int j=u.second+dy[mov];
            if(i<1 || i>n) continue;
            if(j<1 || j>n) continue;
            if(forest[i][j]=='T' || forest[i][j]=='D') continue;
            if(timeBees[i][j]==INT_MAX){
                timeBees[i][j]=timeBees[u.first][u.second]+1;
                Q.push(pii(i,j));
            }
        }
    }
}
pii start;
pii goal;
int dist[805][805];
int fuel[805][805];
bool valid(int moment){
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            dist[i][j]=INT_MAX;
        }
    }
    if(timeBees[start.first][start.second]<=moment-1) return false;
    dist[start.first][start.second]=moment-1;
    fuel[start.first][start.second]=0;
    Q.push(start);
    while(!Q.empty()){
        pii u=Q.front();
        Q.pop();
        if(dist[u.first][u.second]==timeBees[u.first][u.second] && fuel[u.first][u.second]==0) continue;
        for(int mov=0;mov<4;mov++){
            int i=u.first+dx[mov];
            int j=u.second+dy[mov];
            if(i<1 || i>n) continue;
            if(j<1 || j>n) continue;
            if(forest[i][j]=='T') continue;
            int nxt_dist=dist[u.first][u.second];
            if(fuel[u.first][u.second]==0)
                nxt_dist++;
            if(timeBees[i][j]<nxt_dist) continue;
            if(dist[i][j]==INT_MAX){
                dist[i][j]=nxt_dist;
                fuel[i][j]=(fuel[u.first][u.second]>0)? fuel[u.first][u.second]-1 : s-1;
                Q.push(pii(i,j));
            }
        }
    }
    return dist[goal.first][goal.second]!=INT_MAX;
}
int binarySearch(){
    int L=1,R=10000;
    int mid=(L+R)/2;
    int ans=0;
    while(L<=R){
        mid=(L+R)/2;
        if(valid(mid)){
            ans=mid;
            L=mid+1;
        }
        else{
            R=mid-1;
        }
    }
    return ans-1;
}
int main()
{
    vector<pii> beeSource;
    cin>>n>>s;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            cin>>forest[i][j];
            if(forest[i][j]=='H'){
                beeSource.push_back(pii(i,j));
            }
            else if(forest[i][j]=='M'){
                start=pii(i,j);
            }
            else if(forest[i][j]=='D'){
                goal=pii(i,j);
            }
        }
    }
    bfsBees(beeSource);
    int last=binarySearch();
    cout<<last<<'\n';
    return 0;
}

Subtask #1

76.0 / 100.0

#	결과	실행 시간	메모리	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	364 KB	Output is correct
5	Correct	0 ms	364 KB	Output is correct
6	Correct	1 ms	492 KB	Output is correct
7	Correct	139 ms	7660 KB	Output is correct
8	Correct	1 ms	492 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	Correct	1 ms	876 KB	Output is correct
13	Correct	1 ms	748 KB	Output is correct
14	Correct	1 ms	876 KB	Output is correct
15	Correct	1 ms	492 KB	Output is correct
16	Correct	1 ms	492 KB	Output is correct
17	Correct	1 ms	492 KB	Output is correct
18	Correct	1 ms	492 KB	Output is correct
19	Correct	1 ms	620 KB	Output is correct
20	Correct	1 ms	620 KB	Output is correct
21	Correct	1 ms	620 KB	Output is correct
22	Correct	1 ms	620 KB	Output is correct
23	Correct	1 ms	748 KB	Output is correct
24	Correct	1 ms	748 KB	Output is correct
25	Correct	1 ms	748 KB	Output is correct
26	Correct	1 ms	876 KB	Output is correct
27	Correct	1 ms	876 KB	Output is correct
28	Correct	1 ms	876 KB	Output is correct
29	Correct	1 ms	896 KB	Output is correct
30	Correct	1 ms	876 KB	Output is correct
31	Correct	1 ms	876 KB	Output is correct
32	Correct	1 ms	876 KB	Output is correct
33	Incorrect	23 ms	3308 KB	Output isn't correct
34	Incorrect	26 ms	3692 KB	Output isn't correct
35	Correct	33 ms	3896 KB	Output is correct
36	Incorrect	31 ms	3948 KB	Output isn't correct
37	Incorrect	35 ms	4332 KB	Output isn't correct
38	Correct	53 ms	4460 KB	Output is correct
39	Incorrect	36 ms	4204 KB	Output isn't correct
40	Incorrect	46 ms	4844 KB	Output isn't correct
41	Correct	56 ms	4972 KB	Output is correct
42	Incorrect	44 ms	4588 KB	Output isn't correct
43	Incorrect	70 ms	5356 KB	Output isn't correct
44	Correct	70 ms	5484 KB	Output is correct
45	Incorrect	53 ms	5100 KB	Output isn't correct
46	Incorrect	73 ms	5868 KB	Output isn't correct
47	Correct	87 ms	6032 KB	Output is correct
48	Incorrect	65 ms	5612 KB	Output isn't correct
49	Incorrect	89 ms	6432 KB	Output isn't correct
50	Correct	106 ms	6508 KB	Output is correct
51	Incorrect	82 ms	5996 KB	Output isn't correct
52	Incorrect	126 ms	6892 KB	Output isn't correct
53	Correct	140 ms	7020 KB	Output is correct
54	Incorrect	87 ms	6508 KB	Output isn't correct
55	Incorrect	119 ms	7404 KB	Output isn't correct
56	Correct	187 ms	7532 KB	Output is correct
57	Incorrect	108 ms	6892 KB	Output isn't correct
58	Incorrect	138 ms	7980 KB	Output isn't correct
59	Correct	174 ms	8044 KB	Output is correct
60	Incorrect	134 ms	7276 KB	Output isn't correct
61	Incorrect	154 ms	8428 KB	Output isn't correct
62	Correct	220 ms	8564 KB	Output is correct
63	Correct	153 ms	8556 KB	Output is correct
64	Correct	250 ms	8556 KB	Output is correct
65	Correct	206 ms	8704 KB	Output is correct
66	Correct	182 ms	8556 KB	Output is correct
67	Correct	167 ms	8556 KB	Output is correct
68	Correct	87 ms	8568 KB	Output is correct
69	Correct	89 ms	8684 KB	Output is correct
70	Correct	74 ms	8556 KB	Output is correct
71	Correct	81 ms	8684 KB	Output is correct
72	Correct	66 ms	6636 KB	Output is correct
73	Correct	72 ms	8940 KB	Output is correct
74	Correct	104 ms	8812 KB	Output is correct
75	Correct	121 ms	8812 KB	Output is correct
76	Correct	122 ms	8940 KB	Output is correct
77	Correct	109 ms	8812 KB	Output is correct
78	Correct	125 ms	7532 KB	Output is correct
79	Correct	94 ms	7276 KB	Output is correct
80	Correct	109 ms	7276 KB	Output is correct
81	Correct	111 ms	7404 KB	Output is correct
82	Correct	108 ms	7364 KB	Output is correct
83	Correct	140 ms	7532 KB	Output is correct
84	Correct	121 ms	7372 KB	Output is correct
85	Correct	130 ms	7404 KB	Output is correct
86	Correct	132 ms	7404 KB	Output is correct
87	Correct	129 ms	7512 KB	Output is correct
88	Correct	137 ms	7664 KB	Output is correct
89	Correct	160 ms	7416 KB	Output is correct
90	Correct	143 ms	7496 KB	Output is correct
91	Correct	138 ms	7532 KB	Output is correct
92	Correct	152 ms	7532 KB	Output is correct