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Submission #990091

# Submission time Handle Problem Language Result Execution time Memory
990091 2024-05-29T14:36:00 Z bachhoangxuan Mecho (IOI09_mecho) C++17
95 / 100
 131 ms 12132 KB 
// Judges with GCC >= 12 only needs Ofast
// #pragma GCC optimize("O3,no-stack-protector,fast-math,unroll-loops,tree-vectorize")
// MLE optimization
// #pragma GCC optimize("conserve-stack")
// Old judges
// #pragma GCC target("sse4.2,popcnt,lzcnt,abm,mmx,fma,bmi,bmi2")
// New judges. Test with assert(__builtin_cpu_supports("avx2"));
// #pragma GCC target("avx2,popcnt,lzcnt,abm,bmi,bmi2,fma,tune=native")
// Atcoder
// #pragma GCC target("avx2,popcnt,lzcnt,abm,bmi,bmi2,fma")
/*
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
- insert(x),erase(x)
- find_by_order(k): return iterator to the k-th smallest element
- order_of_key(x): the number of elements that are strictly smaller
*/
#include<bits/stdc++.h>
using namespace std;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
uniform_real_distribution<> pp(0.0,1.0);
#define int long long
#define ld long double
#define pii pair<int,int>
#define piii pair<int,pii>
#define mpp make_pair
#define fi first
#define se second
const long long inf=1e18;
const int mod=998244353;
const int maxn=805;
const int B=650;
const int maxs=655;
const int maxm=200005;
const int maxq=1000005;
const int maxl=25;
const int maxa=1000000;
const int root=3;
int power(int a,int n){
    int res=1;
    while(n){
        if(n&1) res=res*a%mod;
        a=a*a%mod;n>>=1;
    }
    return res;
}
const int iroot=power(3,mod-2);
const int base=101;

int sx,sy,tx,ty;
int n,S,d[maxn][maxn],dd[maxn][maxn];
char c[maxn][maxn];
int dx[]={0,0,1,-1},
    dy[]={1,-1,0,0};

bool check(int k){
    memset(dd,-1,sizeof(dd));
    dd[sx][sy]=k*S;
    queue<pii> q;
    q.push({sx,sy});
    //cout << "check " << k << '\n';
    while(!q.empty()){
        auto [x,y]=q.front();q.pop();
        //cout << x << ' ' << y << ' ' << dd[x][y] << '\n';
        if(x==tx && y==ty) return true;
        if(dd[x][y]/S>=d[x][y]) continue;
        for(int t=0;t<4;t++){
            int xt=x+dx[t],yt=y+dy[t];
            if(xt<=0 || yt<=0 || xt>n || yt>n || c[xt][yt]=='T' || dd[xt][yt]!=-1) continue;
            dd[xt][yt]=dd[x][y]+1;
            q.push({xt,yt});
        }
    }
    return false;
}

void solve(){
    cin >> n >> S;
    memset(d,-1,sizeof(d));
    queue<pii> q;
    for(int i=1;i<=n;i++) for(int j=1;j<=n;j++){
        cin >> c[i][j];
        if(c[i][j]=='H'){
            d[i][j]=0;
            q.push({i,j});
        }
        else if(c[i][j]=='M') sx=i,sy=j;
        else if(c[i][j]=='D') tx=i,ty=j;
    }
    while(!q.empty()){
        auto [x,y]=q.front();q.pop();
        //cout << x << ' ' << y << ' ' << d[x][y] << '\n';
        for(int t=0;t<4;t++){
            int xt=x+dx[t],yt=y+dy[t];
            if(xt<=0 || yt<=0 || xt>n || yt>n || c[xt][yt]=='T' || d[xt][yt]!=-1) continue;
            d[xt][yt]=d[x][y]+1;
            q.push({xt,yt});
        }
    }
    int l=0,r=n*n,res=-1;
    while(l<=r){
        int mid=(l+r)>>1;
        if(check(mid)) res=mid,l=mid+1;
        else r=mid-1;
    }
    cout << res << '\n';
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);cout.tie(NULL);
    int test=1;//cin >> test;
    while(test--) solve();
}

Subtask #1
95.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10844 KB Output is correct
2 Correct 2 ms 11256 KB Output is correct
3 Correct 2 ms 10844 KB Output is correct
4 Correct 2 ms 10844 KB Output is correct
5 Correct 2 ms 10844 KB Output is correct
6 Correct 2 ms 10844 KB Output is correct
7 Correct 63 ms 11488 KB Output is correct
8 Correct 2 ms 10844 KB Output is correct
9 Correct 2 ms 10840 KB Output is correct
10 Correct 3 ms 10844 KB Output is correct
11 Correct 2 ms 10844 KB Output is correct
12 Incorrect 3 ms 11100 KB Output isn't correct
13 Correct 2 ms 11100 KB Output is correct
14 Correct 2 ms 11100 KB Output is correct
15 Correct 2 ms 10844 KB Output is correct
16 Correct 2 ms 10844 KB Output is correct
17 Correct 2 ms 10844 KB Output is correct
18 Correct 2 ms 10844 KB Output is correct
19 Correct 2 ms 10844 KB Output is correct
20 Correct 2 ms 11080 KB Output is correct
21 Correct 2 ms 10980 KB Output is correct
22 Correct 3 ms 10844 KB Output is correct
23 Correct 3 ms 10960 KB Output is correct
24 Correct 3 ms 11096 KB Output is correct
25 Correct 3 ms 11100 KB Output is correct
26 Correct 3 ms 11096 KB Output is correct
27 Correct 3 ms 11100 KB Output is correct
28 Correct 3 ms 11100 KB Output is correct
29 Correct 3 ms 11128 KB Output is correct
30 Correct 3 ms 10964 KB Output is correct
31 Correct 3 ms 11096 KB Output is correct
32 Correct 3 ms 10968 KB Output is correct
33 Correct 5 ms 11140 KB Output is correct
34 Correct 5 ms 11340 KB Output is correct
35 Correct 18 ms 11332 KB Output is correct
36 Correct 7 ms 11096 KB Output is correct
37 Correct 7 ms 11348 KB Output is correct
38 Correct 18 ms 11100 KB Output is correct
39 Correct 6 ms 11156 KB Output is correct
40 Correct 7 ms 11352 KB Output is correct
41 Correct 22 ms 11412 KB Output is correct
42 Correct 7 ms 11356 KB Output is correct
43 Correct 8 ms 11368 KB Output is correct
44 Correct 28 ms 11412 KB Output is correct
45 Correct 8 ms 11356 KB Output is correct
46 Correct 8 ms 11356 KB Output is correct
47 Correct 30 ms 11476 KB Output is correct
48 Correct 9 ms 11356 KB Output is correct
49 Correct 9 ms 11356 KB Output is correct
50 Correct 37 ms 11356 KB Output is correct
51 Correct 10 ms 11356 KB Output is correct
52 Correct 10 ms 11504 KB Output is correct
53 Correct 44 ms 11580 KB Output is correct
54 Correct 11 ms 11356 KB Output is correct
55 Correct 11 ms 11576 KB Output is correct
56 Correct 51 ms 11344 KB Output is correct
57 Correct 16 ms 11476 KB Output is correct
58 Correct 12 ms 11484 KB Output is correct
59 Correct 58 ms 11612 KB Output is correct
60 Correct 14 ms 11612 KB Output is correct
61 Correct 13 ms 11612 KB Output is correct
62 Correct 68 ms 11612 KB Output is correct
63 Correct 66 ms 11604 KB Output is correct
64 Correct 131 ms 11592 KB Output is correct
65 Correct 95 ms 11600 KB Output is correct
66 Correct 76 ms 11612 KB Output is correct
67 Correct 75 ms 11636 KB Output is correct
68 Correct 41 ms 11608 KB Output is correct
69 Correct 33 ms 11604 KB Output is correct
70 Correct 26 ms 11456 KB Output is correct
71 Correct 30 ms 11728 KB Output is correct
72 Correct 22 ms 11612 KB Output is correct
73 Correct 23 ms 12124 KB Output is correct
74 Correct 46 ms 12132 KB Output is correct
75 Correct 43 ms 12116 KB Output is correct
76 Correct 45 ms 12112 KB Output is correct
77 Correct 39 ms 12124 KB Output is correct
78 Correct 47 ms 11924 KB Output is correct
79 Correct 32 ms 12120 KB Output is correct
80 Correct 37 ms 11856 KB Output is correct
81 Correct 43 ms 11868 KB Output is correct
82 Correct 37 ms 12124 KB Output is correct
83 Correct 48 ms 11860 KB Output is correct
84 Correct 43 ms 11864 KB Output is correct
85 Correct 46 ms 12060 KB Output is correct
86 Correct 46 ms 12072 KB Output is correct
87 Correct 46 ms 12076 KB Output is correct
88 Correct 48 ms 11864 KB Output is correct
89 Correct 48 ms 11752 KB Output is correct
90 Correct 50 ms 11868 KB Output is correct
91 Correct 49 ms 11856 KB Output is correct
92 Correct 52 ms 11868 KB Output is correct