oj.uz

Submission #870701

# Submission time Handle Problem Language Result Execution time Memory
870701 2023-11-08T23:39:59 Z rsjw Mecho (IOI09_mecho) C++17
100 / 100
 382 ms 10164 KB 
#include <bits/stdc++.h>
using namespace std;
#define pii pair<int,int>
#define mp make_pair
const int N = 1010;
char a[N][N];
int n,m;
const int xp[]={1,-1,0,0};
const int yp[]={0,0,1,-1};
int dis1[N][N],dis2[N][N];
bool check(int limit) {
    int i,j,k; queue<pii> q; pii u;
    int nx,ny,x,y;
    memset(dis1,0x3f,sizeof(dis1));
    memset(dis2,0x3f,sizeof(dis2));
    for(i=1;i<=n;i++) for(j=1;j<=n;j++) {
        if(a[i][j]=='H') {
            q.push(mp(i,j));
            dis1[i][j]=0;
        }
    }
    while(!q.empty()) {
        u=q.front(); q.pop(); tie(x,y)=u;
        for(k=0;k<4;k++) {
            nx=x+xp[k],ny=y+yp[k];
            if(1<=nx&&nx<=n&&1<=ny&&ny<=n&&dis1[nx][ny]>dis1[x][y]+1&&(a[nx][ny]=='G'||a[nx][ny]=='M')) {
                dis1[nx][ny]=dis1[x][y]+1;
                q.push(mp(nx,ny));
            }
        }
    }
    for(i=1;i<=n;i++) for(j=1;j<=n;j++) {
        if(a[i][j]=='M') {
            q.push(mp(i,j));
            dis2[i][j]=0;
            if(limit>=dis1[i][j]) return 0;
        }
    }
    
    while(!q.empty()) {
        u=q.front(); q.pop(); tie(x,y)=u;
        for(k=0;k<4;k++) {
            nx=x+xp[k],ny=y+yp[k];
            if(1<=nx&&nx<=n&&1<=ny&&ny<=n&&dis2[nx][ny]>dis2[x][y]+1&&a[nx][ny]!='T') {
                if((dis2[x][y]+1)/m+limit<dis1[nx][ny]) {
                    dis2[nx][ny]=dis2[x][y]+1;
                    q.push(mp(nx,ny));
                }
            }
        }
    }
    for(i=1;i<=n;i++) for(j=1;j<=n;j++) {
        if(a[i][j]=='D') {
            if(dis2[i][j]!=0x3f3f3f3f) {
                return 1;
            }
        }
    }
    return 0;
}
int main() {
    int i,j;
    cin>>n>>m;
    for(i=1;i<=n;i++) cin>>(a[i]+1);
    int l=0,r=1000005,mid;
    while(l<=r) {
        mid=(l+r)/2;
        if(check(mid)) l=mid+1;
        else r=mid-1;
    } cout<<r<<endl;
    return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:62:11: warning: unused variable 'j' [-Wunused-variable]
   62 |     int i,j;
      |           ^

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 8796 KB Output is correct
2 Correct 4 ms 8796 KB Output is correct
3 Correct 4 ms 8836 KB Output is correct
4 Correct 4 ms 8832 KB Output is correct
5 Correct 4 ms 8796 KB Output is correct
6 Correct 4 ms 8796 KB Output is correct
7 Correct 285 ms 9728 KB Output is correct
8 Correct 4 ms 8796 KB Output is correct
9 Correct 4 ms 8796 KB Output is correct
10 Correct 4 ms 8796 KB Output is correct
11 Correct 4 ms 8796 KB Output is correct
12 Correct 4 ms 8796 KB Output is correct
13 Correct 5 ms 8796 KB Output is correct
14 Correct 5 ms 8796 KB Output is correct
15 Correct 4 ms 8636 KB Output is correct
16 Correct 4 ms 8796 KB Output is correct
17 Correct 4 ms 8796 KB Output is correct
18 Correct 4 ms 8792 KB Output is correct
19 Correct 4 ms 8792 KB Output is correct
20 Correct 4 ms 8796 KB Output is correct
21 Correct 4 ms 8796 KB Output is correct
22 Correct 4 ms 8836 KB Output is correct
23 Correct 4 ms 8792 KB Output is correct
24 Correct 4 ms 8796 KB Output is correct
25 Correct 4 ms 8792 KB Output is correct
26 Correct 4 ms 8796 KB Output is correct
27 Correct 5 ms 8832 KB Output is correct
28 Correct 5 ms 9304 KB Output is correct
29 Correct 6 ms 8648 KB Output is correct
30 Correct 5 ms 8796 KB Output is correct
31 Correct 5 ms 8796 KB Output is correct
32 Correct 5 ms 8644 KB Output is correct
33 Correct 31 ms 8796 KB Output is correct
34 Correct 28 ms 9048 KB Output is correct
35 Correct 46 ms 8796 KB Output is correct
36 Correct 37 ms 8796 KB Output is correct
37 Correct 34 ms 8792 KB Output is correct
38 Correct 61 ms 8796 KB Output is correct
39 Correct 48 ms 9052 KB Output is correct
40 Correct 44 ms 9052 KB Output is correct
41 Correct 73 ms 9052 KB Output is correct
42 Correct 65 ms 9048 KB Output is correct
43 Correct 61 ms 9256 KB Output is correct
44 Correct 93 ms 9160 KB Output is correct
45 Correct 72 ms 9048 KB Output is correct
46 Correct 62 ms 9048 KB Output is correct
47 Correct 111 ms 9052 KB Output is correct
48 Correct 84 ms 9552 KB Output is correct
49 Correct 73 ms 9308 KB Output is correct
50 Correct 138 ms 9308 KB Output is correct
51 Correct 93 ms 9304 KB Output is correct
52 Correct 85 ms 9460 KB Output is correct
53 Correct 153 ms 9304 KB Output is correct
54 Correct 124 ms 9560 KB Output is correct
55 Correct 99 ms 9560 KB Output is correct
56 Correct 193 ms 9584 KB Output is correct
57 Correct 142 ms 9656 KB Output is correct
58 Correct 112 ms 9660 KB Output is correct
59 Correct 212 ms 9660 KB Output is correct
60 Correct 142 ms 9560 KB Output is correct
61 Correct 124 ms 9564 KB Output is correct
62 Correct 232 ms 9564 KB Output is correct
63 Correct 353 ms 9712 KB Output is correct
64 Correct 373 ms 9708 KB Output is correct
65 Correct 367 ms 9712 KB Output is correct
66 Correct 382 ms 9560 KB Output is correct
67 Correct 318 ms 9564 KB Output is correct
68 Correct 329 ms 9740 KB Output is correct
69 Correct 325 ms 9564 KB Output is correct
70 Correct 328 ms 9736 KB Output is correct
71 Correct 329 ms 9740 KB Output is correct
72 Correct 310 ms 9740 KB Output is correct
73 Correct 267 ms 10068 KB Output is correct
74 Correct 267 ms 9816 KB Output is correct
75 Correct 282 ms 10068 KB Output is correct
76 Correct 269 ms 9820 KB Output is correct
77 Correct 268 ms 9820 KB Output is correct
78 Correct 271 ms 9820 KB Output is correct
79 Correct 323 ms 9816 KB Output is correct
80 Correct 296 ms 10064 KB Output is correct
81 Correct 312 ms 9960 KB Output is correct
82 Correct 267 ms 9964 KB Output is correct
83 Correct 296 ms 9816 KB Output is correct
84 Correct 284 ms 9780 KB Output is correct
85 Correct 284 ms 9796 KB Output is correct
86 Correct 293 ms 9816 KB Output is correct
87 Correct 310 ms 10164 KB Output is correct
88 Correct 288 ms 9876 KB Output is correct
89 Correct 304 ms 9872 KB Output is correct
90 Correct 298 ms 9880 KB Output is correct
91 Correct 287 ms 9876 KB Output is correct
92 Correct 287 ms 10128 KB Output is correct