Submission #568588

#	Time	Username	Problem	Language	Result	Execution time	Memory
568588		Waratpp123	The Kingdom of JOIOI (JOI17_joioi)	C++14	0 / 100	1 ms	340 KiB

joioi

#include<bits/stdc++.h>
using namespace std;
int a[2010][2010];
struct A{
    int i,j,w;
    bool operator<(const A&o)const{
        return w>o.w;
    }
};
vector<A> g;
int main(){
    int i,j,n,m;
    scanf("%d %d",&n,&m);
    for(i=1;i<=n;i++){
        for(j=1;j<=m;j++){
            scanf("%d",&a[i][j]);
        }
    }
    for(i=1;i<=n;i++){
        for(j=1;j<m;j++){
            g.push_back({2*i-1,2*j,abs(a[i][j+1]-a[i][j])});
        }
    }
    for(i=1;i<n;i++){
        for(j=1;j<=m;j++){
            g.push_back({2*i,2*j-1,abs(a[i+1][j]-a[i][j])});
        }
    }
    sort(g.begin(),g.end());
    /*for(auto x : g){
        printf("%d %d %d\n",x.i,x.j,x.w);
    }*/
    int l=0,r=n+m+1,mid;
    while(l<r){
        mid=(l+r)/2;
        int ch=0,ans=0;
        vector<pair<int,int>> v;
        v.clear();
        for(i=0;i<=mid;i++){
            v.push_back({g[i].i,g[i].j});
        }
        sort(v.begin(),v.end());
        int inc=-1,dec=1000000007;
        for(auto x: v){
            if(x.second>inc){
                inc=x.second;
            }else{
                ch=1;
                break;
            }
        }
        if(ch==0) ans=1;
        ch=0;
        for(auto x: v){
            if(x.second<dec){
                dec=x.second;
            }else{
                ch=1;
                break;
            }
        }
        if(ch==0) ans=1;
        if(ans==1) l=mid+1;
        else r=mid;
    }
    printf("%d\n",g[l].w);
return 0;
}
/*
6 8
9 8 8 7 9 8 8 6
1 3 9 6 8 3 10 6
10 5 10 7 4 4 3 8
2 3 7 9 8 1 9 9
4 10 10 8 2 7 9 3
6 6 7 7 2 8 1 7
*/

Compilation message (stderr)

joioi.cpp: In function 'int main()':
joioi.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     scanf("%d %d",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~~
joioi.cpp:16:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |             scanf("%d",&a[i][j]);
      |             ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 45
• Subtask 3: 0 / 40