oj.uz

Submission #897802

# Submission time Handle Problem Language Result Execution time Memory
897802 2024-01-03T17:25:37 Z ivaziva Mecho (IOI09_mecho) C++14
100 / 100
 123 ms 11868 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
#define MAXN 810
 
long long n;
long long s;
char matrica[MAXN][MAXN];
long long dist1[MAXN][MAXN];///bee bfs
long long dist2[MAXN][MAXN];///mecho bfs
queue<pair<long long,long long>> bfsq1;
queue<pair<long long,long long>> bfsq2;
 
bool check(long long x,long long y)
{
    if (x>=1 and x<=n and y>=1 and y<=n and (matrica[x][y]=='G' or matrica[x][y]=='M')) return true;
    else return false;
}
 
void bfs1()
{
    while (bfsq1.empty()==false)
    {
        long long x=bfsq1.front().first;
        long long y=bfsq1.front().second;
        bfsq1.pop();
        if (check(x+1,y) and dist1[x+1][y]==LLONG_MAX)
        {
            dist1[x+1][y]=dist1[x][y]+1;
            bfsq1.push({x+1,y});
        }
        if (check(x-1,y) and dist1[x-1][y]==LLONG_MAX)
        {
            dist1[x-1][y]=dist1[x][y]+1;
            bfsq1.push({x-1,y});
        }
        if (check(x,y+1) and dist1[x][y+1]==LLONG_MAX)
        {
            dist1[x][y+1]=dist1[x][y]+1;
            bfsq1.push({x,y+1});
        }
        if (check(x,y-1) and dist1[x][y-1]==LLONG_MAX)
        {
            dist1[x][y-1]=dist1[x][y]+1;
            bfsq1.push({x,y-1});
        }
    }
}
 
void bfs2(long long a,long long b,long long mid)
{
    for (long long i=1;i<=n;i++)
    {
        for (long long j=1;j<=n;j++) dist2[i][j]=LLONG_MAX;
    }
    dist2[a][b]=mid*s; bfsq2.push({a,b});
    while (bfsq2.empty()==false)
    {
        long long x=bfsq2.front().first;
        long long y=bfsq2.front().second;
        bfsq2.pop();
        if (check(x+1,y) and dist2[x+1][y]==LLONG_MAX)
        {
            long long d=dist2[x][y]+1;
            if (d<dist1[x+1][y]*s) dist2[x+1][y]=d;
            else dist2[x+1][y]=-1;
            if (dist2[x+1][y]!=-1) bfsq2.push({x+1,y});
        }
        if (check(x-1,y) and dist2[x-1][y]==LLONG_MAX)
        {
            long long d=dist2[x][y]+1;
            if (d<dist1[x-1][y]*s) dist2[x-1][y]=d;
            else dist2[x-1][y]=-1;
            if (dist2[x-1][y]!=-1) bfsq2.push({x-1,y});
        }
        if (check(x,y+1) and dist2[x][y+1]==LLONG_MAX)
        {
            long long d=dist2[x][y]+1;
            if (d<dist1[x][y+1]*s) dist2[x][y+1]=d;
            else dist2[x][y+1]=-1;
            if (dist2[x][y+1]!=-1) bfsq2.push({x,y+1});
        }
        if (check(x,y-1) and dist2[x][y-1]==LLONG_MAX)
        {
            long long d=dist2[x][y]+1;
            if (d<dist1[x][y-1]*s) dist2[x][y-1]=d;
            else dist2[x][y-1]=-1;
            if (dist2[x][y-1]!=-1) bfsq2.push({x,y-1});
        }
    }
}
 
int main()
{
    ios_base::sync_with_stdio(false);
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin>>n>>s;
    for (long long i=1;i<=n;i++)
    {
        for (long long j=1;j<=n;j++) dist1[i][j]=LLONG_MAX;
    }
    long long a,b;
    long long c,d;
    for (long long i=1;i<=n;i++)
    {
        for (long long j=1;j<=n;j++)
        {
            cin>>matrica[i][j];
            if (matrica[i][j]=='H')
            {
                dist1[i][j]=0;
                bfsq1.push({i,j});
            }
            if (matrica[i][j]=='M') {a=i;b=j;}
            if (matrica[i][j]=='D') {c=i;d=j;}
        }
    }
    bfs1();
    long long l=0;
    long long r=dist1[a][b]-1;
    long long rez=-1;
    while (l<=r)
    {
        long long mid=(l+r)/2;
        bfs2(a,b,mid);
        if (dist2[c-1][d]!=LLONG_MAX and dist2[c-1][d]!=-1 and check(c-1,d)) {rez=mid;l=mid+1;}
        else if (dist2[c+1][d]!=LLONG_MAX and dist2[c+1][d]!=-1 and check(c+1,d)) {rez=mid;l=mid+1;}
        else if (dist2[c][d-1]!=LLONG_MAX and dist2[c][d-1]!=-1 and check(c,d-1)) {rez=mid;l=mid+1;}
        else if (dist2[c][d+1]!=LLONG_MAX and dist2[c][d+1]!=-1 and check(c,d+1)) {rez=mid;l=mid+1;}
        else r=mid-1;
    }
    cout<<rez<<endl;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:106:17: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
  106 |     long long c,d;
      |                 ^
mecho.cpp:106:15: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized]
  106 |     long long c,d;
      |               ^
mecho.cpp:123:27: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
  123 |     long long r=dist1[a][b]-1;
      |                 ~~~~~~~~~~^
mecho.cpp:123:27: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 2 ms 4444 KB Output is correct
4 Correct 1 ms 4444 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 1 ms 4444 KB Output is correct
7 Correct 50 ms 11576 KB Output is correct
8 Correct 1 ms 4440 KB Output is correct
9 Correct 1 ms 4696 KB Output is correct
10 Correct 1 ms 4440 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 1 ms 6748 KB Output is correct
13 Correct 1 ms 6748 KB Output is correct
14 Correct 1 ms 6748 KB Output is correct
15 Correct 1 ms 4444 KB Output is correct
16 Correct 1 ms 4444 KB Output is correct
17 Correct 1 ms 4444 KB Output is correct
18 Correct 1 ms 4444 KB Output is correct
19 Correct 1 ms 6492 KB Output is correct
20 Correct 1 ms 6492 KB Output is correct
21 Correct 1 ms 6748 KB Output is correct
22 Correct 1 ms 6488 KB Output is correct
23 Correct 1 ms 6492 KB Output is correct
24 Correct 1 ms 6492 KB Output is correct
25 Correct 1 ms 6748 KB Output is correct
26 Correct 1 ms 6748 KB Output is correct
27 Correct 1 ms 6748 KB Output is correct
28 Correct 1 ms 6748 KB Output is correct
29 Correct 2 ms 6748 KB Output is correct
30 Correct 1 ms 6492 KB Output is correct
31 Correct 1 ms 6748 KB Output is correct
32 Correct 1 ms 6744 KB Output is correct
33 Correct 5 ms 8796 KB Output is correct
34 Correct 5 ms 8796 KB Output is correct
35 Correct 12 ms 8972 KB Output is correct
36 Correct 8 ms 10844 KB Output is correct
37 Correct 6 ms 10844 KB Output is correct
38 Correct 20 ms 11060 KB Output is correct
39 Correct 8 ms 11100 KB Output is correct
40 Correct 7 ms 11100 KB Output is correct
41 Correct 21 ms 11096 KB Output is correct
42 Correct 8 ms 11100 KB Output is correct
43 Correct 8 ms 11096 KB Output is correct
44 Correct 27 ms 11100 KB Output is correct
45 Correct 10 ms 11004 KB Output is correct
46 Correct 12 ms 11096 KB Output is correct
47 Correct 31 ms 11100 KB Output is correct
48 Correct 12 ms 11100 KB Output is correct
49 Correct 11 ms 11000 KB Output is correct
50 Correct 38 ms 11100 KB Output is correct
51 Correct 13 ms 11100 KB Output is correct
52 Correct 13 ms 11096 KB Output is correct
53 Correct 44 ms 11100 KB Output is correct
54 Correct 15 ms 11096 KB Output is correct
55 Correct 15 ms 11100 KB Output is correct
56 Correct 51 ms 11128 KB Output is correct
57 Correct 17 ms 11156 KB Output is correct
58 Correct 17 ms 11100 KB Output is correct
59 Correct 75 ms 11356 KB Output is correct
60 Correct 21 ms 11356 KB Output is correct
61 Correct 19 ms 11356 KB Output is correct
62 Correct 73 ms 11364 KB Output is correct
63 Correct 69 ms 11352 KB Output is correct
64 Correct 123 ms 11356 KB Output is correct
65 Correct 109 ms 11356 KB Output is correct
66 Correct 77 ms 11356 KB Output is correct
67 Correct 73 ms 11196 KB Output is correct
68 Correct 37 ms 11244 KB Output is correct
69 Correct 29 ms 11352 KB Output is correct
70 Correct 27 ms 11356 KB Output is correct
71 Correct 24 ms 11508 KB Output is correct
72 Correct 23 ms 11352 KB Output is correct
73 Correct 24 ms 11868 KB Output is correct
74 Correct 39 ms 11832 KB Output is correct
75 Correct 46 ms 11864 KB Output is correct
76 Correct 41 ms 11868 KB Output is correct
77 Correct 40 ms 11868 KB Output is correct
78 Correct 45 ms 11864 KB Output is correct
79 Correct 39 ms 11864 KB Output is correct
80 Correct 42 ms 11708 KB Output is correct
81 Correct 42 ms 11868 KB Output is correct
82 Correct 38 ms 11868 KB Output is correct
83 Correct 50 ms 11612 KB Output is correct
84 Correct 42 ms 11612 KB Output is correct
85 Correct 42 ms 11608 KB Output is correct
86 Correct 49 ms 11608 KB Output is correct
87 Correct 63 ms 11600 KB Output is correct
88 Correct 50 ms 11680 KB Output is correct
89 Correct 52 ms 11676 KB Output is correct
90 Correct 54 ms 11672 KB Output is correct
91 Correct 50 ms 11696 KB Output is correct
92 Correct 50 ms 11608 KB Output is correct