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Submission #1119743

# Submission time Handle Problem Language Result Execution time Memory
1119743 2024-11-27T11:31:13 Z sktodow Mecho (IOI09_mecho) C++17
84 / 100
 237 ms 8468 KB 
#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;
 
mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count());
// #define int long long int
#define pb push_back
#define mid (l+(r-l)/2)
#define f first
#define s second
static const int N=805;
static const long long int MOD=(1LL<<61)-1;
static const long long int inf=INT64_MAX;
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> indexed_set;
 
void io(string name = ""){ 
    freopen((name+".in").c_str(), "r", stdin);
    freopen((name+".out").c_str(), "w", stdout);
}
 
int n,x,mx,my,hx,hy;
vector<vector<char>>v(N,vector<char>(N));
vector<vector<int>>bee(N,vector<int>(N,-1));
int mec[N][N];
int dx[4]={0,-1,0,1};
int dy[4]={-1,0,1,0};
 
bool inside(int a,int b){return ((a<=n && a>0)&&(b<=n && b>0)&&(v[a][b]=='G'||v[a][b]=='M'));}
 
void calcbee(){
    queue<array<int,3>>q;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            if(v[i][j]=='H'){q.push({i,j,0});}
        }
    }
    while(q.size()){
        array<int,3>curr=q.front();
        q.pop();
        if(bee[curr[0]][curr[1]]!=-1){continue;}
        bee[curr[0]][curr[1]]=curr[2];
        for(int i=0;i<4;i++){
            if(inside(curr[0]+dx[i],curr[1]+dy[i])){
                q.push({curr[0]+dx[i],curr[1]+dy[i],curr[2]+1});
            }
        }
    }
}
 
bool mecho(int k){
    queue<array<int,3>>q;
    q.push({mx,my,k});
    while(q.size()){
        array<int,3>curr=q.front();
        q.pop();
        if(mec[curr[0]][curr[1]]!=-1){continue;}
        
        mec[curr[0]][curr[1]]=curr[2];
        for(int i=0;i<4;i++){
            if(inside(curr[0]+dx[i],curr[1]+dy[i]) && bee[curr[0]+dx[i]][curr[1]+dy[i]]>(curr[2]+1)/x){
                q.push({curr[0]+dx[i],curr[1]+dy[i],curr[2]+1});
            }
        }
    }
    for(int i=0;i<4;i++){
        if(inside(hx+dx[i],hy+dy[i]) && mec[hx+dx[i]][hy+dy[i]]!=-1){return 1;}
    }
    return 0;
}
 
int32_t main(){
    //io("local");
    ios_base::sync_with_stdio(0); cin.tie(0);
    
    cin>>n>>x;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            cin>>v[i][j];
            if(v[i][j]=='M'){mx=i,my=j;}
            if(v[i][j]=='D'){hx=i,hy=j;}
        }
    }
    calcbee();
    // for(int i=1;i<=n;i++){
    //     for(int j=1;j<=n;j++){cout<<bee[i][j]<<" ";}
    //     cout<<endl;
    // }
    int l=0,r=n*n;
    bool chc=0,achc=0;
    while(l<=r){
        memset(mec,-1,sizeof(mec));
        chc=mecho(mid*(x));
        // cout<<mid<<" "<<chc<<endl;
        if(chc){l=mid+1;achc=1;}
        else{r=mid-1;}
        
        // for(int i=1;i<=n;i++){
        //     for(int j=1;j<=n;j++){cout<<mec[i][j]<<" ";}
        //     cout<<endl;
        // }
        // cout<<endl;
    }
    // memset(mec,-1,sizeof(mec));
    // if(!achc && mecho(0)){cout<<0;}
    if(!achc){cout<<-1;}
    else{cout<<l-1;}
    return 0;
}

Compilation message

mecho.cpp: In function 'void io(std::string)':
mecho.cpp:18:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |     freopen((name+".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:19:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |     freopen((name+".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 6224 KB Output is correct
2 Correct 6 ms 6224 KB Output is correct
3 Correct 6 ms 6224 KB Output is correct
4 Correct 8 ms 6092 KB Output is correct
5 Correct 6 ms 6104 KB Output is correct
6 Correct 7 ms 6224 KB Output is correct
7 Correct 195 ms 7496 KB Output is correct
8 Correct 7 ms 6224 KB Output is correct
9 Correct 8 ms 6224 KB Output is correct
10 Correct 6 ms 6224 KB Output is correct
11 Correct 8 ms 6224 KB Output is correct
12 Incorrect 7 ms 6224 KB Output isn't correct
13 Incorrect 8 ms 6224 KB Output isn't correct
14 Correct 7 ms 6224 KB Output is correct
15 Correct 6 ms 6224 KB Output is correct
16 Correct 7 ms 6224 KB Output is correct
17 Correct 7 ms 6140 KB Output is correct
18 Correct 7 ms 6224 KB Output is correct
19 Correct 8 ms 6224 KB Output is correct
20 Correct 7 ms 6224 KB Output is correct
21 Correct 6 ms 6224 KB Output is correct
22 Correct 7 ms 6224 KB Output is correct
23 Correct 7 ms 6008 KB Output is correct
24 Correct 6 ms 6004 KB Output is correct
25 Correct 8 ms 6236 KB Output is correct
26 Correct 7 ms 6208 KB Output is correct
27 Correct 7 ms 6244 KB Output is correct
28 Correct 8 ms 6224 KB Output is correct
29 Correct 6 ms 6224 KB Output is correct
30 Correct 8 ms 6224 KB Output is correct
31 Correct 8 ms 6224 KB Output is correct
32 Correct 7 ms 6224 KB Output is correct
33 Correct 15 ms 6224 KB Output is correct
34 Correct 12 ms 6224 KB Output is correct
35 Correct 46 ms 6224 KB Output is correct
36 Correct 17 ms 6224 KB Output is correct
37 Correct 21 ms 6160 KB Output is correct
38 Correct 59 ms 6392 KB Output is correct
39 Correct 13 ms 6396 KB Output is correct
40 Correct 16 ms 6224 KB Output is correct
41 Correct 74 ms 6372 KB Output is correct
42 Correct 15 ms 6276 KB Output is correct
43 Correct 17 ms 6248 KB Output is correct
44 Correct 86 ms 6492 KB Output is correct
45 Correct 17 ms 6528 KB Output is correct
46 Correct 17 ms 6524 KB Output is correct
47 Correct 92 ms 6316 KB Output is correct
48 Correct 18 ms 6480 KB Output is correct
49 Correct 20 ms 6596 KB Output is correct
50 Correct 114 ms 6496 KB Output is correct
51 Correct 21 ms 6496 KB Output is correct
52 Correct 23 ms 6648 KB Output is correct
53 Correct 181 ms 6448 KB Output is correct
54 Correct 23 ms 6480 KB Output is correct
55 Correct 23 ms 6712 KB Output is correct
56 Correct 198 ms 6732 KB Output is correct
57 Correct 25 ms 6736 KB Output is correct
58 Correct 30 ms 6736 KB Output is correct
59 Correct 216 ms 6736 KB Output is correct
60 Correct 30 ms 6748 KB Output is correct
61 Correct 33 ms 6736 KB Output is correct
62 Correct 224 ms 6884 KB Output is correct
63 Correct 127 ms 6620 KB Output is correct
64 Correct 237 ms 6736 KB Output is correct
65 Correct 189 ms 6736 KB Output is correct
66 Correct 140 ms 6728 KB Output is correct
67 Correct 135 ms 6728 KB Output is correct
68 Correct 65 ms 6736 KB Output is correct
69 Correct 56 ms 6728 KB Output is correct
70 Correct 49 ms 6784 KB Output is correct
71 Correct 49 ms 6732 KB Output is correct
72 Incorrect 38 ms 6776 KB Output isn't correct
73 Incorrect 79 ms 8408 KB Output isn't correct
74 Correct 109 ms 8376 KB Output is correct
75 Correct 169 ms 7680 KB Output is correct
76 Correct 113 ms 8364 KB Output is correct
77 Correct 122 ms 8468 KB Output is correct
78 Correct 139 ms 8160 KB Output is correct
79 Correct 94 ms 8272 KB Output is correct
80 Correct 124 ms 7940 KB Output is correct
81 Correct 132 ms 8264 KB Output is correct
82 Correct 115 ms 8264 KB Output is correct
83 Correct 165 ms 8016 KB Output is correct
84 Correct 151 ms 7844 KB Output is correct
85 Correct 148 ms 8008 KB Output is correct
86 Correct 143 ms 7844 KB Output is correct
87 Correct 147 ms 7804 KB Output is correct
88 Correct 191 ms 7600 KB Output is correct
89 Correct 166 ms 7752 KB Output is correct
90 Correct 177 ms 7720 KB Output is correct
91 Correct 178 ms 7600 KB Output is correct
92 Correct 195 ms 7540 KB Output is correct