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Submission #91076

# Submission time Handle Problem Language Result Execution time Memory
91076 2018-12-26T06:51:27 Z Retro3014 Mecho (IOI09_mecho) C++17
84 / 100
 209 ms 5500 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+10, 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;
            }
        }
    }
    if(s==N*N+10 || s==N*N+9){
        printf("-1");
        return 0;
    }
    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 560 KB Output is correct
3 Correct 2 ms 560 KB Output is correct
4 Correct 2 ms 560 KB Output is correct
5 Correct 2 ms 560 KB Output is correct
6 Correct 2 ms 560 KB Output is correct
7 Correct 122 ms 5112 KB Output is correct
8 Incorrect 2 ms 5112 KB Output isn't correct
9 Correct 2 ms 5112 KB Output is correct
10 Correct 2 ms 5112 KB Output is correct
11 Correct 2 ms 5112 KB Output is correct
12 Correct 2 ms 5112 KB Output is correct
13 Correct 2 ms 5112 KB Output is correct
14 Incorrect 2 ms 5112 KB Output isn't correct
15 Correct 2 ms 5112 KB Output is correct
16 Correct 2 ms 5112 KB Output is correct
17 Correct 2 ms 5112 KB Output is correct
18 Correct 2 ms 5112 KB Output is correct
19 Correct 2 ms 5112 KB Output is correct
20 Correct 2 ms 5112 KB Output is correct
21 Correct 2 ms 5112 KB Output is correct
22 Correct 2 ms 5112 KB Output is correct
23 Correct 2 ms 5112 KB Output is correct
24 Correct 2 ms 5112 KB Output is correct
25 Correct 2 ms 5112 KB Output is correct
26 Correct 2 ms 5112 KB Output is correct
27 Correct 2 ms 5112 KB Output is correct
28 Correct 2 ms 5112 KB Output is correct
29 Correct 2 ms 5112 KB Output is correct
30 Correct 2 ms 5112 KB Output is correct
31 Correct 2 ms 5112 KB Output is correct
32 Correct 3 ms 5112 KB Output is correct
33 Correct 9 ms 5112 KB Output is correct
34 Correct 9 ms 5112 KB Output is correct
35 Correct 28 ms 5112 KB Output is correct
36 Correct 11 ms 5112 KB Output is correct
37 Correct 11 ms 5112 KB Output is correct
38 Correct 34 ms 5112 KB Output is correct
39 Correct 13 ms 5112 KB Output is correct
40 Correct 13 ms 5112 KB Output is correct
41 Correct 45 ms 5112 KB Output is correct
42 Correct 16 ms 5112 KB Output is correct
43 Correct 16 ms 5112 KB Output is correct
44 Correct 60 ms 5112 KB Output is correct
45 Correct 19 ms 5112 KB Output is correct
46 Correct 20 ms 5112 KB Output is correct
47 Correct 65 ms 5112 KB Output is correct
48 Correct 22 ms 5112 KB Output is correct
49 Correct 23 ms 5112 KB Output is correct
50 Correct 80 ms 5112 KB Output is correct
51 Correct 26 ms 5112 KB Output is correct
52 Correct 26 ms 5112 KB Output is correct
53 Correct 101 ms 5112 KB Output is correct
54 Correct 29 ms 5112 KB Output is correct
55 Correct 30 ms 5112 KB Output is correct
56 Correct 142 ms 5112 KB Output is correct
57 Correct 34 ms 5112 KB Output is correct
58 Correct 34 ms 5112 KB Output is correct
59 Correct 146 ms 5112 KB Output is correct
60 Correct 36 ms 5112 KB Output is correct
61 Correct 38 ms 5112 KB Output is correct
62 Correct 180 ms 5220 KB Output is correct
63 Correct 121 ms 5220 KB Output is correct
64 Correct 177 ms 5220 KB Output is correct
65 Correct 209 ms 5232 KB Output is correct
66 Correct 179 ms 5232 KB Output is correct
67 Incorrect 130 ms 5232 KB Output isn't correct
68 Correct 68 ms 5232 KB Output is correct
69 Correct 73 ms 5232 KB Output is correct
70 Correct 62 ms 5232 KB Output is correct
71 Correct 64 ms 5232 KB Output is correct
72 Correct 55 ms 5232 KB Output is correct
73 Correct 56 ms 5372 KB Output is correct
74 Correct 86 ms 5376 KB Output is correct
75 Correct 93 ms 5376 KB Output is correct
76 Correct 86 ms 5376 KB Output is correct
77 Correct 82 ms 5376 KB Output is correct
78 Incorrect 96 ms 5500 KB Output isn't correct
79 Correct 71 ms 5500 KB Output is correct
80 Correct 87 ms 5500 KB Output is correct
81 Correct 101 ms 5500 KB Output is correct
82 Correct 85 ms 5500 KB Output is correct
83 Correct 93 ms 5500 KB Output is correct
84 Correct 95 ms 5500 KB Output is correct
85 Correct 99 ms 5500 KB Output is correct
86 Correct 102 ms 5500 KB Output is correct
87 Correct 103 ms 5500 KB Output is correct
88 Correct 98 ms 5500 KB Output is correct
89 Correct 102 ms 5500 KB Output is correct
90 Correct 108 ms 5500 KB Output is correct
91 Correct 122 ms 5500 KB Output is correct
92 Correct 119 ms 5500 KB Output is correct