oj.uz

Submission #1097091

# Submission time Handle Problem Language Result Execution time Memory
1097091 2024-10-06T03:40:05 Z InvMOD Mecho (IOI09_mecho) C++14
100 / 100
 136 ms 15000 KB 
#include <bits/stdc++.h>
using namespace std;

#define fi first
#define se second
#define gcd __gcd
#define sz(v) (int) v.size()
#define pb push_back
#define pi pair<int,int>
#define all(v) (v).begin(), (v).end()
#define compact(v) (v).erase(unique(all(v)), (v).end())
#define FOR(i, a, b) for(int i = (a); i <= (b); i++)
#define int long long

using ll = long long;
using ld = long double;
using ull = unsigned long long;

template<typename T> bool ckmx(T& a, const T& b){if(a < b) return a = b, true; return false;}
template<typename T> bool ckmn(T& a, const T& b){if(a > b) return a = b, true; return false;}

const int N = 1e3+5;
const ll MOD = 1e9+7;
const ll INF = 1e18;

const int dx[4] = {1, -1, 0, 0};
const int dy[4] = {0, 0, 1, -1};

int n, s, d[N][N], vis[N][N];
char a[N][N];

bool init(int x, int y){
    return (x >= 1 && x <= n) && (y >= 1 && y <= n) && a[x][y] != 'T';
}

bool good(int time){
    pi st, ed;
    FOR(i, 1, n){
        FOR(j, 1, n){
            if(a[i][j] == 'M'){
                st = make_pair(i,j);
                vis[i][j] = 0;
            }
            else{
                if(a[i][j] == 'D'){
                    ed = make_pair(i, j);
                }
                vis[i][j] = 1e9;
            }
        }
    }

    /* broke test without checking
        7 3
        GTGGGGG
        GTGGGGG
        GTGGGGG
        HMGGGGD
        GTGGGGG
        GTGGGGG
        GTGGGGG
    */

    if(time >= d[st.fi][st.se]) return false;

    queue<pair<int,int>> q;
    q.push(st);

    while(sz(q)){
        pi e = q.front(); q.pop();

        int x = e.fi, y = e.se;
        for(int i = 0; i < 4; i++){
            int xx = x + dx[i];
            int yy = y + dy[i];
            if(init(xx, yy) && vis[xx][yy] == 1e9 && a[xx][yy] != 'H'){
                int n_dist = (vis[x][y] + 1) / s;
                if(n_dist < d[xx][yy] - time){
                    vis[xx][yy] = vis[x][y] + 1;
                    q.push(make_pair(xx, yy));
                }
            }
        }
    }

    return vis[ed.fi][ed.se] != 1e9;
}

void solve()
{
    cin >> n >> s;
    FOR(i, 1, n){
        FOR(j, 1, n){
            cin >> a[i][j];
        }
    }

    queue<pair<int,int>> q;

    FOR(i, 1, n){
        FOR(j, 1, n){
            if(a[i][j] == 'H'){
                q.push(make_pair(i,j));
            }
            else d[i][j] = 1e9;
        }
    }

    while(sz(q)){
        pi e = q.front(); q.pop();

        int x = e.fi, y = e.se;
        for(int i = 0; i < 4; i++){
            int xx = x + dx[i];
            int yy = y + dy[i];
            if(init(xx, yy) && d[xx][yy] == 1e9 && a[xx][yy] != 'D'){
                d[xx][yy] = d[x][y] + 1;
                q.push(make_pair(xx, yy));
            }
        }
    }

    int l = -1, r = 1e9;
    while(l+1 < r){
        int m = l+r>>1;
        if(good(m)){
            l = m;
        }
        else r = m;
    }
    cout << l <<"\n";
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    #define name "InvMOD"
    if(fopen(name".INP", "r")){
        freopen(name".INP","r",stdin);
        freopen(name".OUT","w",stdout);
    }

    int t = 1; //cin >> t;
    while(t--) solve();
    return 0;
}

Compilation message

mecho.cpp: In function 'void solve()':
mecho.cpp:125:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  125 |         int m = l+r>>1;
      |                 ~^~
mecho.cpp: In function 'int main()':
mecho.cpp:142:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  142 |         freopen(name".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:143:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  143 |         freopen(name".OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 352 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 460 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 87 ms 14680 KB Output is correct
8 Correct 0 ms 600 KB Output is correct
9 Correct 1 ms 600 KB Output is correct
10 Correct 0 ms 604 KB Output is correct
11 Correct 0 ms 604 KB Output is correct
12 Correct 1 ms 976 KB Output is correct
13 Correct 0 ms 860 KB Output is correct
14 Correct 1 ms 860 KB Output is correct
15 Correct 0 ms 604 KB Output is correct
16 Correct 0 ms 604 KB Output is correct
17 Correct 0 ms 604 KB Output is correct
18 Correct 1 ms 604 KB Output is correct
19 Correct 1 ms 604 KB Output is correct
20 Correct 1 ms 604 KB Output is correct
21 Correct 0 ms 860 KB Output is correct
22 Correct 0 ms 604 KB Output is correct
23 Correct 1 ms 716 KB Output is correct
24 Correct 0 ms 860 KB Output is correct
25 Correct 1 ms 1232 KB Output is correct
26 Correct 1 ms 860 KB Output is correct
27 Correct 1 ms 1116 KB Output is correct
28 Correct 1 ms 1116 KB Output is correct
29 Correct 1 ms 1116 KB Output is correct
30 Correct 1 ms 1116 KB Output is correct
31 Correct 1 ms 1116 KB Output is correct
32 Correct 1 ms 1116 KB Output is correct
33 Correct 8 ms 5656 KB Output is correct
34 Correct 9 ms 5464 KB Output is correct
35 Correct 18 ms 5464 KB Output is correct
36 Correct 9 ms 6488 KB Output is correct
37 Correct 9 ms 6504 KB Output is correct
38 Correct 25 ms 6492 KB Output is correct
39 Correct 11 ms 7772 KB Output is correct
40 Correct 11 ms 7892 KB Output is correct
41 Correct 30 ms 7772 KB Output is correct
42 Correct 13 ms 9052 KB Output is correct
43 Correct 12 ms 9052 KB Output is correct
44 Correct 39 ms 9048 KB Output is correct
45 Correct 17 ms 9820 KB Output is correct
46 Correct 15 ms 9820 KB Output is correct
47 Correct 47 ms 9820 KB Output is correct
48 Correct 19 ms 10844 KB Output is correct
49 Correct 20 ms 10840 KB Output is correct
50 Correct 57 ms 10860 KB Output is correct
51 Correct 24 ms 11612 KB Output is correct
52 Correct 21 ms 11612 KB Output is correct
53 Correct 69 ms 11748 KB Output is correct
54 Correct 29 ms 12636 KB Output is correct
55 Correct 27 ms 12636 KB Output is correct
56 Correct 77 ms 12624 KB Output is correct
57 Correct 27 ms 13544 KB Output is correct
58 Correct 32 ms 13548 KB Output is correct
59 Correct 87 ms 13404 KB Output is correct
60 Correct 31 ms 14420 KB Output is correct
61 Correct 30 ms 14428 KB Output is correct
62 Correct 113 ms 14372 KB Output is correct
63 Correct 102 ms 14328 KB Output is correct
64 Correct 135 ms 14460 KB Output is correct
65 Correct 136 ms 14416 KB Output is correct
66 Correct 97 ms 14416 KB Output is correct
67 Correct 94 ms 14420 KB Output is correct
68 Correct 50 ms 14512 KB Output is correct
69 Correct 49 ms 14428 KB Output is correct
70 Correct 38 ms 14416 KB Output is correct
71 Correct 41 ms 14416 KB Output is correct
72 Correct 38 ms 14416 KB Output is correct
73 Correct 46 ms 14940 KB Output is correct
74 Correct 58 ms 14904 KB Output is correct
75 Correct 63 ms 14928 KB Output is correct
76 Correct 58 ms 14928 KB Output is correct
77 Correct 69 ms 14928 KB Output is correct
78 Correct 70 ms 15000 KB Output is correct
79 Correct 57 ms 14936 KB Output is correct
80 Correct 61 ms 14776 KB Output is correct
81 Correct 66 ms 14940 KB Output is correct
82 Correct 60 ms 14928 KB Output is correct
83 Correct 75 ms 14676 KB Output is correct
84 Correct 68 ms 14684 KB Output is correct
85 Correct 70 ms 14676 KB Output is correct
86 Correct 73 ms 14672 KB Output is correct
87 Correct 70 ms 14676 KB Output is correct
88 Correct 75 ms 14684 KB Output is correct
89 Correct 75 ms 14784 KB Output is correct
90 Correct 94 ms 14652 KB Output is correct
91 Correct 79 ms 14780 KB Output is correct
92 Correct 77 ms 14676 KB Output is correct