Submission #75996

#	Time	Username	Problem	Language	Result	Execution time	Memory
75996		Vardanyan	Luxury burrow (IZhO13_burrow)	C++14	100 / 100	767 ms	12640 KiB

burrow

#include <bits/stdc++.h>
using namespace std;
const int N = 1005;
int b[N][N];
int a[N][N];
int L[N];
int R[N];
int n,m,k;
int get(int x){
    int mxs = 0;
    for(int i = 1;i<=n;i++){
        for(int j = 1;j<=m;j++){
            if(b[i][j] >= x) a[i][j] = a[i-1][j]+1;
            else a[i][j] = 0;
        }
    }
    for(int i = 1;i<=n;i++){
        memset(L,0,sizeof(L));
        memset(R,0,sizeof(R));
        for(int j = 1;j<=m;j++){
            int u = a[i][j];
            int l = j,r = j;
            L[j] = j;
            while(l>1){
                if(L[l]<l && L[l]) l = L[l];
                else l--;
                if(a[i][l]<u){
                    l++;
                    break;
                }
            }
            L[j] = l;
        }
        for(int j = m;j>=1;j--){
            int r = j;
            int u = a[i][j];
            while(r<m){
                    if(R[r]>r) r = R[r];
                    else r++;
                    if(a[i][r]<u){
                        r--;
                        break;
                    }
            }
            R[j] = r;
        }
        for(int j = 1;j<=m;j++)
        mxs = max(mxs,(R[j]-L[j]+1)*a[i][j]);
    }
    return mxs;
}
int main(){
    scanf("%d%d%d",&n,&m,&k);
    vector<int> all;
    for(int i = 1;i<=n;i++){
        for(int j = 1;j<=m;j++){
                scanf("%d",&b[i][j]);
                    all.push_back(b[i][j]);
        }
    }
    sort(all.begin(),all.end());
    int l = 0;
    int r = all.size()-1;
    int ans = 0;
    int mxs = k;
    while(l<=r){
        int m = (l+r)/2;
        int y = get(all[m]);
        if(y>=k){
            ans = m;
            mxs = y;
            l = m+1;
        }
        else r = m-1;
    }
    cout<<all[ans]<<" "<<mxs<<endl;
    return 0;
}

Compilation message (stderr)

burrow.cpp: In function 'int get(int)':
burrow.cpp:22:23: warning: unused variable 'r' [-Wunused-variable]
             int l = j,r = j;
                       ^
burrow.cpp: In function 'int main()':
burrow.cpp:53:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d",&n,&m,&k);
     ~~~~~^~~~~~~~~~~~~~~~~~~
burrow.cpp:57:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
                 scanf("%d",&b[i][j]);
                 ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 100 / 100