oj.uz

Submission #1102871

# Submission time Handle Problem Language Result Execution time Memory
1102871 2024-10-19T05:53:42 Z salmon Mecho (IOI09_mecho) C++14
100 / 100
 371 ms 3068 KB 
#include <bits/stdc++.h>
using namespace std;

int N;
int S;
vector<pair<int,int>> trans = {{1,0}, {-1,0},{0,1},{0,-1}};
char clst[810][810];
int s1,s2;
int f1,f2;
queue<pair<int,int>> q[2];
queue<pair<int,int>> m[2];
vector<pair<int,int>> spood;
bool visited[810][810];
bool vt[810][810];
int cq,cm;

bool check(int i, int j){
    if(i < 0) return false;
    if(i >= N) return false;
    if(j < 0) return false;
    if(j >= N) return false;
    return true;
}

void spreadhoney(int it){
    while(!q[it].empty()){
        pair<int,int> ii = q[it].front();
        q[it].pop();

        int i = ii.first;
        int j = ii.second;

        if(visited[i][j]) continue;
        visited[i][j] = true;
        vt[i][j] = true;

        for(pair<int,int> ii : trans){
            int ni = ii.first + i;
            int nj = ii.second + j;

            if(!check(ni,nj)) continue;
            if(visited[ni][nj]) continue;
            q[1 - it].push({ni,nj});
        }
    }
}

int main(){
    scanf(" %d",&N);
    scanf(" %d",&S);

    for(int i = 0; i < N; i++){
        for(int j = 0; j < N; j++){
            scanf(" %c",&clst[i][j]);
        }
    }

    for(int i = 0; i < N; i++){
        for(int j = 0; j < N; j++){
            visited[i][j] = false;
            vt[i][j] = false;
        }
    }

    for(int i = 0; i < N; i++){
        for(int j = 0; j < N; j++){
            if(clst[i][j] == 'T'){
                visited[i][j] = true;
                vt[i][j] = true;
            }
            else if(clst[i][j] == 'H'){
                q[1].push({i,j});
            }
            else if(clst[i][j] == 'M'){
                s1 = i;
                s2 = j;
            }
            else if(clst[i][j] == 'D'){
                f1 = i;
                f2 = j;
                visited[i][j] = true;
            }
        }
    }

    cq = 0;
    cm = 0;

    spreadhoney(1);

    vt[s1][s2] = true;

    for(pair<int,int> ii : trans){
        int ni = s1 + ii.first;
        int nj = s2 + ii.second;

        if(!check(ni,nj)) continue;
        m[0].push({ni,nj});
    }

    bool flag;

    while(true){
        int it = cm % 2;

        bool done = false;

        for(int i = 0; i < S - 1; i++, cm++){
            it = cm % 2;

            while(!m[it].empty()){
                pair<int,int> ii = m[it].front();
                m[it].pop();

                int i = ii.first;
                int j = ii.second;

                if(i == f1 && j == f2){
                    done = true;
                    flag = true;
                    break;
                }
                if(vt[i][j]) continue;
                vt[i][j] = true;

                for(pair<int,int> ii : trans){
                    int ni = i + ii.first;
                    int nj = j + ii.second;

                    if(!check(ni,nj)) continue;
                    if(vt[ni][nj]) continue;
                    m[1 - it].push({ni,nj});
                }
            }

            if(done) break;

            if(m[1 - it].empty()){
                done = true;
                flag = false;
                break;
            }
        }

        if(done) break;

        it = cq % 2;
        spreadhoney(it);
        cq++;

        it = cm % 2;

        while(!m[it].empty()){
            pair<int,int> ii = m[it].front();
            m[it].pop();

            int i = ii.first;
            int j = ii.second;
            //printf("%d %d\n",i,j);

            if(i == f1 && j == f2){
                done = true;
                flag = true;
                break;
            }
            if(vt[i][j]) continue;
            vt[i][j] = true;

            for(pair<int,int> ii : trans){
                int ni = i + ii.first;
                int nj = j + ii.second;

                if(!check(ni,nj)) continue;
                m[1 - it].push({ni,nj});
            }
        }
        //printf("\n");

        if(done) break;

        if(m[1 - it].empty()){
            done = true;
            flag = false;
            break;
        }

        cm++;

        if(done) break;
    }

    if(!flag){
        printf("-1");
        return 0;
    }

    int s = 0;
    int e = 800*800;
    int m1;

    while(s != e){
        m1 = (s + e + 1)/2;

        for(int i = 0; i < N; i++){
            for(int j = 0; j < N; j++){
                visited[i][j] = false;
                vt[i][j] = false;
            }
        }

        while(!m[0].empty()) m[0].pop();
        while(!m[1].empty()) m[1].pop();
        while(!q[0].empty()) q[0].pop();
        while(!q[1].empty()) q[1].pop();

        for(int i = 0; i < N; i++){
            for(int j = 0; j < N; j++){
                if(clst[i][j] == 'T'){
                    visited[i][j] = true;
                    vt[i][j] = true;
                }
                else if(clst[i][j] == 'H'){
                    q[1].push({i,j});
                }
                else if(clst[i][j] == 'D'){
                    visited[i][j] = true;
                }
            }
        }

        cq = 0;
        cm = 0;

        spreadhoney(1);

        vt[s1][s2] = true;

        for(pair<int,int> ii : trans){
            int ni = s1 + ii.first;
            int nj = s2 + ii.second;

            if(!check(ni,nj)) continue;
            m[0].push({ni,nj});
        }

        for(int i = 0; i < m1; i++, cq++){
            int it = cq % 2;

            spreadhoney(it);
        }

        if(visited[s1][s2]){
            e = m1 - 1;
            continue;
        }

        /*for(int i = 0; i < N; i++){
            for(int j = 0; j < N; j++){
                printf("%d ",visited[i][j]);
            }
            printf("\n");
        }
        printf("\n");*/

        bool flag;

        while(true){
            int it = cm % 2;

            bool done = false;

            for(int i = 0; i < S - 1; i++, cm++){
                it = cm % 2;

                while(!m[it].empty()){
                    pair<int,int> ii = m[it].front();
                    m[it].pop();

                    int i = ii.first;
                    int j = ii.second;
                    //printf("%d %d\n",i,j);

                    if(i == f1 && j == f2){
                        done = true;
                        flag = true;
                        break;
                    }
                    if(vt[i][j]) continue;
                    vt[i][j] = true;

                    for(pair<int,int> ii : trans){
                        int ni = i + ii.first;
                        int nj = j + ii.second;

                        if(!check(ni,nj)) continue;
                        m[1 - it].push({ni,nj});
                    }
                }
                //printf("\n");

                if(done) break;

                if(m[1 - it].empty()){
                    done = true;
                    flag = false;
                    break;
                }
            }

            if(done) break;

            it = cq % 2;
            spreadhoney(it);
            cq++;

            it = cm % 2;

            while(!m[it].empty()){
                pair<int,int> ii = m[it].front();
                m[it].pop();

                int i = ii.first;
                int j = ii.second;
                //printf("%d %d\n",i,j);

                if(i == f1 && j == f2){
                    done = true;
                    flag = true;
                    break;
                }
                if(vt[i][j]) continue;
                vt[i][j] = true;

                for(pair<int,int> ii : trans){
                    int ni = i + ii.first;
                    int nj = j + ii.second;

                    if(!check(ni,nj)) continue;
                    m[1 - it].push({ni,nj});
                }
            }
            //printf("\n");

            if(done) break;

            if(m[1 - it].empty()){
                done = true;
                flag = false;
                break;
            }

            cm++;

            if(done) break;
        }

        if(flag){
            s = m1;
        }
        else{
            e = m1 - 1;
        }
    }

    printf("%d",s);
}
/*
7 3
TTTTTTT
TGGGGGT
THGGGGG
MGGGGGD
TGGTTTT
TGGGGGT
TTTTTHT
*/

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:49:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |     scanf(" %d",&N);
      |     ~~~~~^~~~~~~~~~
mecho.cpp:50:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |     scanf(" %d",&S);
      |     ~~~~~^~~~~~~~~~
mecho.cpp:54:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |             scanf(" %c",&clst[i][j]);
      |             ~~~~~^~~~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 336 KB Output is correct
2 Correct 4 ms 336 KB Output is correct
3 Correct 3 ms 336 KB Output is correct
4 Correct 4 ms 504 KB Output is correct
5 Correct 3 ms 472 KB Output is correct
6 Correct 4 ms 336 KB Output is correct
7 Correct 332 ms 2444 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 3 ms 336 KB Output is correct
10 Correct 3 ms 336 KB Output is correct
11 Correct 3 ms 336 KB Output is correct
12 Correct 4 ms 592 KB Output is correct
13 Correct 4 ms 336 KB Output is correct
14 Correct 1 ms 592 KB Output is correct
15 Correct 4 ms 336 KB Output is correct
16 Correct 3 ms 504 KB Output is correct
17 Correct 4 ms 516 KB Output is correct
18 Correct 4 ms 336 KB Output is correct
19 Correct 5 ms 336 KB Output is correct
20 Correct 4 ms 336 KB Output is correct
21 Correct 4 ms 336 KB Output is correct
22 Correct 4 ms 336 KB Output is correct
23 Correct 5 ms 336 KB Output is correct
24 Correct 4 ms 336 KB Output is correct
25 Correct 4 ms 604 KB Output is correct
26 Correct 4 ms 592 KB Output is correct
27 Correct 4 ms 420 KB Output is correct
28 Correct 4 ms 592 KB Output is correct
29 Correct 4 ms 592 KB Output is correct
30 Correct 4 ms 592 KB Output is correct
31 Correct 5 ms 500 KB Output is correct
32 Correct 4 ms 592 KB Output is correct
33 Correct 30 ms 1276 KB Output is correct
34 Correct 25 ms 1104 KB Output is correct
35 Correct 49 ms 1104 KB Output is correct
36 Correct 35 ms 1408 KB Output is correct
37 Correct 31 ms 1360 KB Output is correct
38 Correct 68 ms 1400 KB Output is correct
39 Correct 43 ms 1512 KB Output is correct
40 Correct 38 ms 1532 KB Output is correct
41 Correct 96 ms 1360 KB Output is correct
42 Correct 53 ms 1616 KB Output is correct
43 Correct 44 ms 1616 KB Output is correct
44 Correct 94 ms 1644 KB Output is correct
45 Correct 59 ms 1616 KB Output is correct
46 Correct 55 ms 1616 KB Output is correct
47 Correct 113 ms 1616 KB Output is correct
48 Correct 75 ms 1872 KB Output is correct
49 Correct 65 ms 1872 KB Output is correct
50 Correct 134 ms 1880 KB Output is correct
51 Correct 85 ms 1872 KB Output is correct
52 Correct 75 ms 1872 KB Output is correct
53 Correct 172 ms 1864 KB Output is correct
54 Correct 95 ms 1872 KB Output is correct
55 Correct 85 ms 2112 KB Output is correct
56 Correct 192 ms 2112 KB Output is correct
57 Correct 122 ms 2140 KB Output is correct
58 Correct 93 ms 2128 KB Output is correct
59 Correct 216 ms 2240 KB Output is correct
60 Correct 125 ms 2268 KB Output is correct
61 Correct 112 ms 2344 KB Output is correct
62 Correct 248 ms 2376 KB Output is correct
63 Correct 260 ms 2348 KB Output is correct
64 Correct 289 ms 2124 KB Output is correct
65 Correct 250 ms 2332 KB Output is correct
66 Correct 268 ms 2128 KB Output is correct
67 Correct 33 ms 2364 KB Output is correct
68 Correct 252 ms 2348 KB Output is correct
69 Correct 208 ms 2344 KB Output is correct
70 Correct 252 ms 2384 KB Output is correct
71 Correct 249 ms 2384 KB Output is correct
72 Correct 239 ms 2384 KB Output is correct
73 Correct 276 ms 2924 KB Output is correct
74 Correct 336 ms 2896 KB Output is correct
75 Correct 361 ms 2896 KB Output is correct
76 Correct 357 ms 3068 KB Output is correct
77 Correct 371 ms 2896 KB Output is correct
78 Correct 34 ms 2640 KB Output is correct
79 Correct 316 ms 2860 KB Output is correct
80 Correct 326 ms 2640 KB Output is correct
81 Correct 329 ms 2640 KB Output is correct
82 Correct 329 ms 2640 KB Output is correct
83 Correct 341 ms 2640 KB Output is correct
84 Correct 363 ms 2644 KB Output is correct
85 Correct 359 ms 2640 KB Output is correct
86 Correct 370 ms 2632 KB Output is correct
87 Correct 355 ms 2640 KB Output is correct
88 Correct 356 ms 2632 KB Output is correct
89 Correct 370 ms 2448 KB Output is correct
90 Correct 358 ms 2688 KB Output is correct
91 Correct 340 ms 2680 KB Output is correct
92 Correct 341 ms 2556 KB Output is correct