oj.uz

Submission #54675

# Submission time Handle Problem Language Result Execution time Memory
54675 2018-07-04T12:00:45 Z okaybody10 Mecho (IOI09_mecho) C++
100 / 100
 242 ms 52292 KB 
#include <bits/stdc++.h>
using namespace std;
typedef pair<int,int> pii;
typedef pair<pii,int> piii;
int dx[4]={-1,0,1,0},dy[4]={0,1,0,-1};
int pre[2000][2000];
char mark[2000][2000];
int homex,homey;
int s,sx,sy,N;
bool test(int time)
{
    bool reach[2005][2005];
    memset(reach,0,sizeof(reach));
    if(time * s >= pre[sx][sy]) return false;
    queue<piii> q;
    q.push(make_pair(make_pair(sx,sy),time*s));
    reach[sx][sy]=1;
    while(!q.empty())
    {
        int x=q.front().first.first;
        int y=q.front().first.second;
        int dis=q.front().second;
        if(mark[x][y]=='D') return true;
        q.pop();
        for(int c=0;c<4;c++)
        {
            int cx=x+dx[c],cy=y+dy[c];
            if(cx<0 || cx>=N || cy<0 || cy>=N || pre[cx][cy]<=dis+1 || mark[cx][cy]=='T' || reach[cx][cy]) continue;
            reach[cx][cy]=true;
            q.push(make_pair(make_pair(cx,cy),dis+1));
        }
    }
    return false;
}
int main()
{
    memset(pre,-1,sizeof(pre));
    scanf("%d %d",&N,&s);
    queue<pii> que;
    for(int i=0;i<N;i++)scanf("%s",mark[i]);
    for(int i=0;i<N;i++){
            for(int j=0;j<N;j++)
            {
                if(mark[i][j]=='M') sx=i,sy=j,mark[i][j]='G';
                if(mark[i][j]=='D') homex=i,homey=j;
                if(mark[i][j]=='H') que.push(make_pair(i,j)),pre[i][j]=0;
            }
    }
    pre[homex][homey]=N*N*s;
    while(!que.empty())
    {
        int x=que.front().first;
        int y=que.front().second;
        int dis=pre[x][y];
        que.pop();
        for(int c=0;c<4;c++)
        {
            int cx=x+dx[c],cy=y+dy[c];
            if(cx<0 || cx>=N || cy<0 || cy>=N || pre[cx][cy]!=-1 || mark[cx][cy]!='G') continue;
            pre[cx][cy]=dis+s;
            que.push(make_pair(cx,cy));
        }
    }
    int low=0,high=N*N*2,ans=-1;
    for(;low<high;)
    {
        int mid=(low+high)/2;
        if(test(mid)) ans=max(ans,mid),low=mid+1;
        else high=mid;
    }
    return !printf("%d",ans);
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:38:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&N,&s);
     ~~~~~^~~~~~~~~~~~~~~
mecho.cpp:40:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i=0;i<N;i++)scanf("%s",mark[i]);
                         ~~~~~^~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 19968 KB Output is correct
2 Correct 20 ms 20080 KB Output is correct
3 Correct 18 ms 20080 KB Output is correct
4 Correct 17 ms 20080 KB Output is correct
5 Correct 18 ms 20080 KB Output is correct
6 Correct 18 ms 20216 KB Output is correct
7 Correct 143 ms 22484 KB Output is correct
8 Correct 20 ms 22484 KB Output is correct
9 Correct 21 ms 22484 KB Output is correct
10 Correct 20 ms 22484 KB Output is correct
11 Correct 19 ms 22484 KB Output is correct
12 Correct 21 ms 22484 KB Output is correct
13 Correct 22 ms 22484 KB Output is correct
14 Correct 20 ms 22484 KB Output is correct
15 Correct 22 ms 22484 KB Output is correct
16 Correct 18 ms 22484 KB Output is correct
17 Correct 19 ms 22484 KB Output is correct
18 Correct 18 ms 22484 KB Output is correct
19 Correct 18 ms 22484 KB Output is correct
20 Correct 18 ms 22484 KB Output is correct
21 Correct 19 ms 22484 KB Output is correct
22 Correct 22 ms 22484 KB Output is correct
23 Correct 21 ms 22484 KB Output is correct
24 Correct 19 ms 22484 KB Output is correct
25 Correct 21 ms 22484 KB Output is correct
26 Correct 19 ms 22484 KB Output is correct
27 Correct 20 ms 22484 KB Output is correct
28 Correct 19 ms 22484 KB Output is correct
29 Correct 19 ms 22484 KB Output is correct
30 Correct 21 ms 22484 KB Output is correct
31 Correct 19 ms 22484 KB Output is correct
32 Correct 21 ms 22484 KB Output is correct
33 Correct 27 ms 22484 KB Output is correct
34 Correct 25 ms 22484 KB Output is correct
35 Correct 52 ms 22484 KB Output is correct
36 Correct 28 ms 22484 KB Output is correct
37 Correct 26 ms 22576 KB Output is correct
38 Correct 55 ms 22692 KB Output is correct
39 Correct 25 ms 23056 KB Output is correct
40 Correct 25 ms 23328 KB Output is correct
41 Correct 82 ms 23524 KB Output is correct
42 Correct 26 ms 23752 KB Output is correct
43 Correct 30 ms 24000 KB Output is correct
44 Correct 76 ms 24436 KB Output is correct
45 Correct 29 ms 24624 KB Output is correct
46 Correct 33 ms 24956 KB Output is correct
47 Correct 133 ms 25216 KB Output is correct
48 Correct 27 ms 25668 KB Output is correct
49 Correct 28 ms 26000 KB Output is correct
50 Correct 130 ms 26364 KB Output is correct
51 Correct 33 ms 26984 KB Output is correct
52 Correct 35 ms 27376 KB Output is correct
53 Correct 124 ms 27944 KB Output is correct
54 Correct 30 ms 28360 KB Output is correct
55 Correct 33 ms 28776 KB Output is correct
56 Correct 152 ms 29328 KB Output is correct
57 Correct 32 ms 29960 KB Output is correct
58 Correct 32 ms 30512 KB Output is correct
59 Correct 174 ms 31220 KB Output is correct
60 Correct 32 ms 31872 KB Output is correct
61 Correct 33 ms 32500 KB Output is correct
62 Correct 205 ms 33128 KB Output is correct
63 Correct 154 ms 33844 KB Output is correct
64 Correct 242 ms 34396 KB Output is correct
65 Correct 231 ms 35012 KB Output is correct
66 Correct 168 ms 35640 KB Output is correct
67 Correct 169 ms 36268 KB Output is correct
68 Correct 75 ms 36900 KB Output is correct
69 Correct 62 ms 37524 KB Output is correct
70 Correct 57 ms 38152 KB Output is correct
71 Correct 63 ms 38780 KB Output is correct
72 Correct 51 ms 39408 KB Output is correct
73 Correct 61 ms 40292 KB Output is correct
74 Correct 85 ms 41028 KB Output is correct
75 Correct 117 ms 41564 KB Output is correct
76 Correct 123 ms 42208 KB Output is correct
77 Correct 119 ms 42944 KB Output is correct
78 Correct 129 ms 43436 KB Output is correct
79 Correct 75 ms 44012 KB Output is correct
80 Correct 111 ms 44720 KB Output is correct
81 Correct 108 ms 45464 KB Output is correct
82 Correct 87 ms 46000 KB Output is correct
83 Correct 128 ms 46532 KB Output is correct
84 Correct 159 ms 47124 KB Output is correct
85 Correct 106 ms 47748 KB Output is correct
86 Correct 113 ms 48404 KB Output is correct
87 Correct 109 ms 49136 KB Output is correct
88 Correct 125 ms 49760 KB Output is correct
89 Correct 118 ms 50388 KB Output is correct
90 Correct 131 ms 50840 KB Output is correct
91 Correct 135 ms 51548 KB Output is correct
92 Correct 118 ms 52292 KB Output is correct