Submission #762805

#	Time	Username	Problem	Language	Result	Execution time	Memory
762805		AmirElarbi	Virus Experiment (JOI19_virus)	C++14	0 / 100	2 ms	340 KiB

virus

#include <bits/stdc++.h>
#define ve vector
#define vi vector<int>
#define vii vector<ii>
#define ii pair<int,int>
#define fi first
#define se second
#define ll long long
#define INF 1e9+7
#define pb push_back
#define optimise ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template<class T>
using Tree = tree<T, null_type, less<T>, rb_tree_tag,
    tree_order_statistics_node_update>;
const int MOD = 1e9+7;
const int nax = 800+5;
void readio(){
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
}
int grid[nax][nax], vis[nax][nax];
int mx[16];
int ad[4][2] = {{-1,0}, {1,0}, {0,-1}, {0,1}};
map<char,int> mp;
int m,r,c;
int dfs(int x, int y){
    vis[x][y] = 1;
    int res = 1;
    for(int k = 0; k < 4; k++){
        int nx = x + ad[k][0], ny = y + ad[k][1];
        if(nx < 0 || ny < 0 || nx >= r || ny >= c || vis[nx][ny] || !grid[nx][ny]) continue;
        int cur = 0;
        for(int i = 0; i < 4; i++){
            int vx = nx + ad[i][0], vy = ny + ad[i][1];
            if(vx < 0 || vy < 0 || vx >= r || vy >= c || grid[vx][vy] == 0) continue;
            if(vis[vx][vy]) cur += (1 << i);
        }
        //cout << nx << " " << ny<< " " << cur << " " << mx[cur] << endl;
        if(grid[nx][ny] > mx[cur]) continue;
        res += dfs(nx, ny);
    }
    return res;
}
int main()
{
    optimise;
    readio();
    cin >> m >> r >> c;
    string wind;
    cin >> wind;
    wind = wind + wind;
    mp['S'] = 0, mp['N'] = 1, mp['W'] = 2, mp['E'] = 3;
    for (int i = 0; i < 16; ++i)
    {
        int cur = 0;
        for (int k = 0; k < wind.size(); ++k)
        {
            bool test = false;
            for (int j = 0; j < 4; ++j)
            {
                if(i & (1 << j)){
                    if(mp[wind[k]] == j) test = true;
                }  
            }
            if(test) cur++;
            else cur = 0;
            mx[i] = max(mx[i], cur);
        }
        //cout << mx[i] << " ";
    }
    //cout << endl;
    
    if(mx[1] == wind.size()) mx[1] = INF;
    if(mx[2] == wind.size()) mx[2] = INF;
    if(mx[4] == wind.size()) mx[4] = INF;
    if(mx[8] == wind.size()) mx[8] = INF;
    for (int i = 0; i < r; ++i)
    {
        for (int j = 0; j < c; ++j)
        {
            cin >> grid[i][j];
        }
    }
    int mn = INF, aff = 0;
    if(r <= 50 && c <= 50){
        for(int i = 0; i < r; i++){
            for(int j = 0; j < c; j++){
                if(!grid[i][j]) continue;
                memset(vis, 0, sizeof vis);
                int cur = dfs(i, j);
                //cout << i <<  " " << j << " " << cur << endl;
                if(mn > cur) mn = cur, aff = 1;
                else if(mn == cur) aff++;
            }
        }
    } else {
        for (int i = 0; i < r; ++i)
        {
            int low = 0, high = 1;
            for (int j = 0; j < c; ++j)
            {   
                low = min(low, j);
                high = max(high, j+1);
                if(!grid[i][j]) {
                    low = j+1;
                    continue;
                }
                if(grid[i][j-1] > mx[8]) low = j;
                while(high < c && grid[i][high] <= mx[4] && grid[i][high] != 0) high++;
                int cur = high - low;
                //cout << j << " " << low << " " << high << endl;
                if(mn > cur) mn = cur, aff = 1;
                else if(mn == cur) aff++;
            }
        }
    }
    cout << mn << " " << aff << endl;
}

Compilation message (stderr)

virus.cpp: In function 'int main()':
virus.cpp:61:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |         for (int k = 0; k < wind.size(); ++k)
      |                         ~~^~~~~~~~~~~~~
virus.cpp:78:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   78 |     if(mx[1] == wind.size()) mx[1] = INF;
      |        ~~~~~~^~~~~~~~~~~~~~
virus.cpp:79:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |     if(mx[2] == wind.size()) mx[2] = INF;
      |        ~~~~~~^~~~~~~~~~~~~~
virus.cpp:80:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   80 |     if(mx[4] == wind.size()) mx[4] = INF;
      |        ~~~~~~^~~~~~~~~~~~~~
virus.cpp:81:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   81 |     if(mx[8] == wind.size()) mx[8] = INF;
      |        ~~~~~~^~~~~~~~~~~~~~
virus.cpp: In function 'void readio()':
virus.cpp:22:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
virus.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 14
• Subtask 2: 0 / 6
• Subtask 3: 0 / 80