제출 #442325

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
442325		Haidara	Mecho (IOI09_mecho)	C++17	58 / 100	226 ms	7164 KiB

mecho

    /* * * * * * * * * *\
     * Author: Haidara *
     * LANG: C++17     *
     * PROB:           *
    \* * * * * * * * * */
    #include<bits/stdc++.h>
    #define fast ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    #define int long long
    #define rep(i,x,n) for(int i=x;i<(n);i++)
    #define FOR(i,n) rep(i,0,n)
    #define per(i,x,n) for(int i=x;i>(n);i--)
    #define ROF(i,x) for(int i=x;i>=0;i--)
    #define v(i) vector< i >
    #define p(i,j) pair< i , j >
    #define pii pair<int,int>
    #define m(i,j) map< i , j >
    #define um(i,j) unordered_map< i , j >
    #define pq(i) priority_queue< i >
    #define ff first
    #define all(x) x.begin(),x.end()
    #define ss second
    #define pp push_back
    using namespace std;
    void SIO(string name="")
    {
        if(name!="")
        {
            freopen((name+".in").c_str(),"r",stdin);
            freopen((name+".out").c_str(),"w",stdout);
        }
    }
    const int inf=1LL<<62LL;
    const int mod=1e9+7;
    const int maxn=808;
    char a[maxn][maxn];
    int n,jump;
    pii M,D;
    queue<pii>q;
    int dist[maxn][maxn],dx[] {-1,1,0,0},dy[] {0,0,1,-1};
    bool valid(int x,int y)
    {
        return x>=0&&y>=0&&x<n&&y<n&&a[x][y]!='T';
    }
    void solve()
    {
        while(q.size())
        {
            pii f=q.front();
            q.pop();
            FOR(i,4)
            {
                int x=f.ff+dx[i],y=f.ss+dy[i];
                if(valid(x,y)&&dist[x][y]==inf)
                    dist[x][y]=dist[f.ff][f.ss]+jump,q.push({x,y});
            }
        }
    }
    bool check(int st)
    {
        queue<p(pii,int)>qq;
        qq.push({M,st*jump});
        bool vis[maxn][maxn];
        FOR(i,maxn)
        FOR(j,maxn)
        vis[i][j]=0;
        bool ret=0;
        vis[M.ff][M.ss]=1;
        while(qq.size())
        {
            pii f=qq.front().ff;
            int curr=qq.front().ss;
            qq.pop();
            if(f==D)
                ret=1;
            FOR(i,4)
            {
                int x=f.ff+dx[i],y=f.ss+dy[i];
                if(valid(x,y))
                {
                    if(dist[x][y]>curr+1&&!vis[x][y])
                        qq.push({{x,y},curr+1}),vis[x][y]=1;
                }
            }
        }
        return ret;
    }
    signed main()
    {
        SIO("");
        cin>>n>>jump;
        FOR(i,n){
          cin>>ws;
        FOR(j,n)
        {
            dist[i][j]=inf;
            cin>>a[i][j];
            if(a[i][j]=='M')
                M= {i,j};
            else if(a[i][j]=='D')
                D= {i,j};
            else if(a[i][j]=='H')
                q.push({i,j}),dist[i][j]=0;
        }}
        solve();
        int l=1,r=maxn*maxn*2,ans=-1;
        while(l<=r)
        {
            int mid=l+(r-l)/2;
            if(check(mid))
                ans=max(ans,mid),l=mid+1;
            else
                r=mid-1;
        }
        cout<<ans;
    }

컴파일 시 표준 에러 (stderr) 메시지

mecho.cpp: In function 'void SIO(std::string)':
mecho.cpp:28:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |             freopen((name+".in").c_str(),"r",stdin);
      |             ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mecho.cpp:29:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |             freopen((name+".out").c_str(),"w",stdout);
      |             ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 58 / 100