Submission #1009560

#	Time	Username	Problem	Language	Result	Execution time	Memory
1009560		yeediot	Virus Experiment (JOI19_virus)	C++17	0 / 100	108 ms	28356 KiB

virus

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define F first
#define S second
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define pb push_back
#define sz(x) (int)(x.size())
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
#define vi vector<int>
#define vp vector<pii>
#define vvi vector<vi>
#define ykh mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count())
#define __lg(x) 63-__builtin_clzll(x)
#define pow2(x) (1LL<<x)
void __print(int x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}
#ifdef local
void CHECK();
void setio(){
    freopen("/Users/iantsai/cpp/input.txt","r",stdin);
    freopen("/Users/iantsai/cpp/output.txt","w",stdout);
}
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
void setio(){}
#define debug(x...)
#endif
#define TOI_is_so_de ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);setio();
const int mxn = 1e5+5, inf = 1e18, mxc = 805;
int w[2*mxn];
vector<pii>dir = {{-1, 0}, {0, 1}, {0, -1}, {1, 0}};
int t, n, m, mxw = 0, mxe = 0, v[mxc][mxc], len[16], to[mxc*mxc], num[mxc*mxc], col[mxc][mxc], cur, an[mxc][mxc];
bool owo[mxc*mxc];
int find(int x){
    return x == to[x] ? x : to[x] = find(to[x]);
}
void merge(int x, int y){
    x = find(x);
    y = find(y);
    if(x == y) return ;
    num[y] += num[x];
    to[x] = y;
}
bool check(int x, int y){
    if(v[x][y] == 0) return 0;
    int mask = 0, i = 0;
    for(auto [dx, dy] : dir){
        int nx = x + dx;
        int ny = y + dy;
        if(col[nx][ny] == cur) mask |= (1 << i);
        i++;
    }
    return len[mask] >= v[x][y];
}
bool bfs(int sx, int sy){
    queue<pair<int,int>> q;
    q.push({sx, sy});
    int sid = sx*m+sy, cnt = 0;
    col[sx][sy] = ++cur;
    while(sz(q)){
        auto [nx, ny] = q.front();
        //debug(nx, ny);
        q.pop();
        cnt++;
        int nid = nx*m+ny;
        if(find(nid) != find(sid)) {
            merge(sid, nid);
            return 1;
        }
        for(auto [dx, dy] : dir){
            int x = nx + dx;
            int y = ny + dy;
            if(!(1 <= x and x <= n and 1 <= y and y <= m)) continue;
            if(col[x][y] == col[sx][sy]) continue;
            if(!check(x, y)) continue;
            col[x][y] = col[sx][sy];
            q.push({x, y});
        }
    }
    //debug('\n');
    an[sx][sy] = cnt;
    return 0;
}
signed main(){
    TOI_is_so_de;
    cin >> t >> n >> m;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            num[i*m+j] = 1;
            to[i*m+j] = i*m+j;
            owo[i*m+j] = 1;
            an[i][j] = inf;
        }
    }
    for(int i=1;i<=t;i++){
        char c;
        cin >> c;
        if(c == 'W'){
            w[i] = 2;
        }
        else if(c == 'N'){
            w[i] = 0;
        }
        else if(c == 'E'){
            w[i] = 1;
        }
        else {
            w[i] = 3;
        }
        w[i+t] = w[i];
    }
    int cnt = 0;
    for(int i = 0; i < 16; i++){
        cnt = 0;
        for(int j = 1; j <= 2*t; j++){
            if(i >> w[j] & 1){
                chmax(len[i], ++cnt);
            }
            else{
                cnt = 0;
            }
        }
        if(len[i] == 2*t) len[i] = inf;
    }
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            cin >> v[i][j];
        }
    }
    /*for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            cerr << find(i*m+j) << ' ';
        }
        cerr << '\n';
    }
    cerr << '\n';*/
    while(1){
        bool flag = 0;
        for(int i=1;i<=n;i++){
            for(int j=1;j<=m;j++){
                if(v[i][j] == 0) continue;
                int id = i*m+j;
                if(to[id] != id) continue;
                if(owo[id] == 0) continue;
                flag |= bfs(i, j);
            }
        }
        /*for(int i=1;i<=n;i++){
            for(int j=1;j<=m;j++){
                cerr << find(i*m+j) << ' ';
            }
            cerr << '\n';
        }
        cerr << '\n';*/
        if(!flag) break;
    }
    int ans = inf;
    cnt = 0;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            int id = i*m+j;
            if(to[id] != id or v[i][j] == 0) continue;
            bfs(i, j);
            //cerr << to[id] << ',' << id << ',' << an[i][j] << ' ';
            if(ans > an[i][j]){
                ans = an[i][j];
                cnt = an[i][j];
            }
            else{
                cnt += an[i][j];
            }
        }
        //cerr << '\n';
    }
    cout << ans << '\n' << cnt << '\n';
    #ifdef local
    CHECK();
    #endif
}
/*
input:
 
*/
#ifdef local
void CHECK(){
    cerr << "\n[Time]: " << 1000.0 * clock() / CLOCKS_PER_SEC << " ms.\n";
     function<bool(string,string)> compareFiles = [](string p1, string p2)->bool {
         std::ifstream file1(p1);
         std::ifstream file2(p2);
         if (!file1.is_open() || !file2.is_open())return false;
         std::string line1, line2;
         while (getline(file1, line1) && getline(file2, line2)) {
             if (line1 != line2)return false;
         }
         int cnta=0,cntb=0;
         while(getline(file1,line1))cnta++;
         while(getline(file2,line2))cntb++;
         return cntb-cnta<=1;
     };
     bool check = compareFiles("output.txt","expected.txt");
     if (check) cerr<<"ACCEPTED\n";
     else cerr<<"WRONG ANSWER!\n";
}
#else
#endif



 

Compilation message (stderr)

virus.cpp: In function 'void setIO(std::string)':
virus.cpp:35:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
virus.cpp:36:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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