Submission #98268

#	Time	Username	Problem	Language	Result	Execution time	Memory
98268		Vasiljko	Maxcomp (info1cup18_maxcomp)	C++14	0 / 100	3 ms	384 KiB

maxcomp

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
const ll MOD = 1e9+7;
const int N = 1e3+5;
const ll INF = 1e9+5;
const int dirx[]={1,0,-1,0};
const int diry[]={0,-1,0,1};

struct field{
    int x,y;
    ll val,len;

    field(int _x=0,int _y=0,ll _val=0,ll _len=0){
        x=_x;
        y=_y;
        val=_val;
        len=_len;
    }

    bool operator <(const field &rhs) const{
        if(val!=rhs.val)return val<rhs.val;
        if(len!=rhs.len)return len<rhs.len;
        if(x!=rhs.x)return x<rhs.x;
        return y<rhs.y;
    }
};



int n,m;
ll a[N][N],mx,r[N][N];
map<field,bool>vis;
queue<field>q;

bool ok(int x,int y){
    return x>=1&&x<=n&&y>=1&&y<=m;
}

int main()
{
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            cin>>a[i][j];
            if(a[i][j]>mx)mx=a[i][j];
        }
    }

    for(int i=1;i<=n;i++)for(int j=1;j<=m;j++)r[i][j]=INF;

    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            if(a[i][j]==mx){
                q.push(field(i,j,mx,1));
                while(!q.empty()){
                    auto e=q.front();
                    q.pop();

                    for(int k=0;k<4;k++){
                        int newx=e.x+dirx[k];
                        int newy=e.y+diry[k];
                        if(!ok(newx,newy))continue;

                        ll newval=min(e.val,a[newx][newy]);
                        if(newval+e.len+1<r[newx][newy]){
                            r[newx][newy]=newval+e.len+1;
                            q.push(field(newx,newy,newval,e.len+1));
                        }
                    }
                }
            }
        }
    }

    /*for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            if(a[i][j]==mx){
                q.push(field(i,j,mx,1));
                r[i][j]=mx+1;
            }else{
                r[i][j]=INF;
            }
        }
    }*/

    /*while(!q.empty()){
        auto e=q.front();
        q.pop();
        if(vis[e])continue;
        ll len=e.len;
        ll val=e.val;

        for(int i=0;i<4;i++){
            int newx=e.x+dirx[i];
            int newy=e.y+diry[i];
            if(!ok(newx,newy))continue;//not in the matrix
            r[newx][newy]=min(r[newx][newy],min(e.val,a[newx][newy])+len+1);
            q.push(field(newx,newy,min(a[newx][newy],e.val),len+1));
        }
    }*/

    ll ans=-2LL*INF;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=m;j++){
            ans=max(ans,mx-r[i][j]);
        }
    }

    cout<<ans;
    return 0;
}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 15
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40