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Submission #91074

# Submission time Handle Problem Language Result Execution time Memory
91074 2018-12-26T06:48:31 Z Retro3014 Mecho (IOI09_mecho) C++17
84 / 100
 196 ms 5484 KB 
#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <deque>


#define MAX_N 800

struct S{
    int x, y;
    bool operator ==(const S &a)const{
        return (x==a.x) && (y==a.y);
    }
};

using namespace std;
int N, K;
string str[MAX_N+1];
bool type[MAX_N+1][MAX_N+1];
S M, D;
bool visited[MAX_N+1][MAX_N+1];
int dist[MAX_N+1][MAX_N+1];

bool chk(int t, int p){
    S tmp={t, p};
    if(tmp.x<0 || tmp.x>=N || tmp.y<0 || tmp.y>=N)  return false;
    if(visited[t][p])   return false;
    if(type[t][p])   return false;
    return true;
}

int dx[4]={0, 0, 1, -1}, dy[4]={1, -1, 0, 0};
deque<S> dq;
void BFS(){
    for(int i=0; i<dq.size(); i++){
        visited[dq[i].x][dq[i].y]=true;
    }
    while(!dq.empty()){
        S now = dq.front();
        dq.pop_front();
        for(int k=0; k<4; k++){
            if(chk(now.x+dx[k], now.y+dy[k]) && !(now.x+dx[k]==D.x && now.y+dy[k]==D.y)){
                dist[now.x+dx[k]][now.y+dy[k]]=dist[now.x][now.y]+1;
                visited[now.x+dx[k]][now.y+dy[k]]=true;
                dq.push_back({now.x+dx[k], now.y+dy[k]});
            }
        }
    }
    for(int i=0; i<N; i++){
        for(int j=0; j<N; j++){
            visited[i][j]=false;
        }
    }
}

bool can(int T){
    for(int i=0; i<N; i++){
        for(int j=0; j<N; j++){
            visited[i][j]=false;
        }
    }
    int t=0;
    dq.clear();
    dq.push_back(M);
    visited[M.x][M.y]=true;
    while(!dq.empty()){
        int sz=(int)dq.size();
        while(sz--){
            S now = dq.front();
            dq.pop_front();
            if(dist[now.x][now.y]>T){
                if(now==D)  return true;
                for(int k=0; k<4; k++){
                    if(chk(now.x+dx[k], now.y+dy[k]) && dist[now.x+dx[k]][now.y+dy[k]]>T){
                        visited[now.x+dx[k]][now.y+dy[k]]=true;
                        dq.push_back({now.x+dx[k], now.y+dy[k]});
                    }
                }
            }
        }
        t++;
        if(t==K){
            t=0; T++;
        }
    }
    return false;
}

int main(){
    scanf("%d%d", &N, &K);
    for(int i=0; i<N; i++){
        cin>>str[i];
        for(int j=0; j<N; j++){
            if(str[i][j]=='T')  type[i][j]=1;
            else if(str[i][j]=='M')    M={i, j};
            else if(str[i][j]=='D')    D={i, j};
            else if(str[i][j]=='H'){
                dq.push_back({i, j});
            }
        }
    }
    dist[D.x][D.y]=MAX_N*MAX_N+1;
    BFS();
    int s=0, e=N*N+1, mid;
    while(s<e){
        if(s==e-1){
            if(can(e)){
                s=e;
            }else{
                e=s;
            }
        }else{
            mid=(s+e)/2;
            if(can(mid)){
                s=mid;
            }else{
                e=mid-1;
            }
        }
    }
    printf("%d", s);
    return 0;
}

Compilation message

mecho.cpp: In function 'void BFS()':
mecho.cpp:36:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0; i<dq.size(); i++){
                  ~^~~~~~~~~~
mecho.cpp: In function 'int main()':
mecho.cpp:91:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &N, &K);
     ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 500 KB Output is correct
3 Correct 2 ms 500 KB Output is correct
4 Correct 2 ms 520 KB Output is correct
5 Correct 2 ms 532 KB Output is correct
6 Correct 2 ms 660 KB Output is correct
7 Correct 119 ms 5232 KB Output is correct
8 Incorrect 2 ms 5232 KB Output isn't correct
9 Correct 2 ms 5232 KB Output is correct
10 Correct 2 ms 5232 KB Output is correct
11 Correct 2 ms 5232 KB Output is correct
12 Correct 2 ms 5232 KB Output is correct
13 Correct 2 ms 5232 KB Output is correct
14 Incorrect 2 ms 5232 KB Output isn't correct
15 Correct 2 ms 5232 KB Output is correct
16 Correct 2 ms 5232 KB Output is correct
17 Correct 2 ms 5232 KB Output is correct
18 Correct 2 ms 5232 KB Output is correct
19 Correct 2 ms 5232 KB Output is correct
20 Correct 2 ms 5232 KB Output is correct
21 Correct 2 ms 5232 KB Output is correct
22 Correct 2 ms 5232 KB Output is correct
23 Correct 2 ms 5232 KB Output is correct
24 Correct 2 ms 5232 KB Output is correct
25 Correct 2 ms 5232 KB Output is correct
26 Correct 2 ms 5232 KB Output is correct
27 Correct 2 ms 5232 KB Output is correct
28 Correct 2 ms 5232 KB Output is correct
29 Correct 2 ms 5232 KB Output is correct
30 Correct 2 ms 5232 KB Output is correct
31 Correct 2 ms 5232 KB Output is correct
32 Correct 2 ms 5232 KB Output is correct
33 Correct 9 ms 5232 KB Output is correct
34 Correct 9 ms 5232 KB Output is correct
35 Correct 28 ms 5232 KB Output is correct
36 Correct 11 ms 5232 KB Output is correct
37 Correct 11 ms 5232 KB Output is correct
38 Correct 36 ms 5232 KB Output is correct
39 Correct 13 ms 5232 KB Output is correct
40 Correct 14 ms 5232 KB Output is correct
41 Correct 46 ms 5232 KB Output is correct
42 Correct 16 ms 5232 KB Output is correct
43 Correct 17 ms 5232 KB Output is correct
44 Correct 70 ms 5232 KB Output is correct
45 Correct 19 ms 5232 KB Output is correct
46 Correct 20 ms 5232 KB Output is correct
47 Correct 69 ms 5232 KB Output is correct
48 Correct 22 ms 5232 KB Output is correct
49 Correct 23 ms 5232 KB Output is correct
50 Correct 91 ms 5232 KB Output is correct
51 Correct 25 ms 5232 KB Output is correct
52 Correct 25 ms 5232 KB Output is correct
53 Correct 99 ms 5232 KB Output is correct
54 Correct 28 ms 5232 KB Output is correct
55 Correct 30 ms 5232 KB Output is correct
56 Correct 139 ms 5232 KB Output is correct
57 Correct 34 ms 5232 KB Output is correct
58 Correct 34 ms 5232 KB Output is correct
59 Correct 152 ms 5232 KB Output is correct
60 Correct 37 ms 5232 KB Output is correct
61 Correct 38 ms 5232 KB Output is correct
62 Correct 164 ms 5248 KB Output is correct
63 Correct 116 ms 5248 KB Output is correct
64 Correct 163 ms 5248 KB Output is correct
65 Correct 196 ms 5248 KB Output is correct
66 Correct 166 ms 5248 KB Output is correct
67 Incorrect 144 ms 5248 KB Output isn't correct
68 Correct 70 ms 5248 KB Output is correct
69 Correct 77 ms 5248 KB Output is correct
70 Correct 68 ms 5248 KB Output is correct
71 Correct 69 ms 5248 KB Output is correct
72 Correct 57 ms 5248 KB Output is correct
73 Correct 60 ms 5408 KB Output is correct
74 Correct 90 ms 5408 KB Output is correct
75 Correct 95 ms 5408 KB Output is correct
76 Correct 90 ms 5412 KB Output is correct
77 Correct 84 ms 5448 KB Output is correct
78 Incorrect 96 ms 5448 KB Output isn't correct
79 Correct 71 ms 5448 KB Output is correct
80 Correct 82 ms 5448 KB Output is correct
81 Correct 92 ms 5448 KB Output is correct
82 Correct 82 ms 5448 KB Output is correct
83 Correct 98 ms 5448 KB Output is correct
84 Correct 98 ms 5448 KB Output is correct
85 Correct 109 ms 5484 KB Output is correct
86 Correct 101 ms 5484 KB Output is correct
87 Correct 103 ms 5484 KB Output is correct
88 Correct 97 ms 5484 KB Output is correct
89 Correct 102 ms 5484 KB Output is correct
90 Correct 113 ms 5484 KB Output is correct
91 Correct 127 ms 5484 KB Output is correct
92 Correct 114 ms 5484 KB Output is correct