oj.uz

답안 #692354

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
692354 2023-02-01T11:09:11 Z Paul_Liao_1457 The Kingdom of JOIOI (JOI17_joioi) C++17
60 / 100
 4000 ms 188636 KB 
//記得跳題
#include<iostream>
#include<array>
#include<vector>
#include<string>
#include<algorithm>
#include<set>
#include<queue>
#include<stack>
#include<math.h>
#include<map>
#include<unordered_map>
#include<cstring>
#include<iomanip>
#include<bitset>
#include<tuple>
 
#define ll long long
#define int ll
#define LL __int128_t
#define DB double
#define FOR(i,a,b) for(int i=a;i<b;i++)
#define REP(i,a,b) for(int i=a;i>=b;i--)
#define pb push_back
#define mp make_pair
#define INF (ll)(2e9)
#define MOD (ll)(1e9+7)
#define F first
#define S second
#define endl "\n"
#define AC ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;
 
struct func{
    bool operator()(const int &x, const int &y) const{
        return x<y;
    }
};
 
template<class T> using PQ=priority_queue<T,vector<T>,func>;
 
void file(){
    freopen("/Users/liaoyunyang/Desktop/meta_in.txt","r",stdin);
    freopen("/Users/liaoyunyang/Desktop/meta_out.txt","w",stdout);
}

int a[2][2005][2005],init[2005][2005],ih,iw,pre[2][2005][2005],suf[2][2005][2005];

int h,w,ans=INF;

void dfs(int i,int j,int max1,int min1,int max2,int min2){
    if(i==h+1){
        if(j==0) return;
        //cout<<max1<<" "<<min1<<" "<<max2<<" "<<min2<<endl;
        ans=min(ans,max(max1-min1,max2-min2)); return;
    }
    FOR(x,j,w+1){
        dfs(i+1,x,max(max1,pre[1][i][x]),min(min1,pre[0][i][x]),max(max2,suf[1][i][x+1]),min(min2,suf[0][i][x+1]));
    }
}

void dfs2(int i,int j,int max1,int min1,int max2,int min2){
    //cout<<"i="<<i<<" j="<<j<<endl;
    //cout<<max1<<" "<<min1<<" "<<max2<<" "<<min2<<endl;
    if(i==h+1){
        if(j==w) return;
        ans=min(ans,max(max1-min1,max2-min2)); return;
    }
    REP(x,j,0){
        dfs2(i+1,x,max(max1,pre[1][i][x]),min(min1,pre[0][i][x]),max(max2,suf[1][i][x+1]),min(min2,suf[0][i][x+1]));
    }
}

void turn(int t){
    FOR(i,1,w+1){
        FOR(j,1,h+1){
            a[t][i][j]=a[t^1][j][w-i+1];
        }
    }
    swap(h,w);
}

void flap(int t){
    FOR(i,1,h+1){
        FOR(j,1,w+1){
            a[t][i][j]=a[t^1][h-i+1][w-j+1];
        }
    }
}

int now=0;
int minn=INF;

bool check(int k){
    //cout<<"k="<<k<<endl;
    FOR(i,1,8){
        bool ok=1;
        if(i==4){
            flap(now^1); now^=1;
        }
        FOR(i,1,h+1){
            pre[1][i][0]=0;
            suf[1][i][w+1]=0;
            pre[0][i][0]=INF;
            suf[0][i][w+1]=INF;
            FOR(j,1,w+1){
                pre[0][i][j]=min(pre[0][i][j-1],a[now][i][j]);
                pre[1][i][j]=max(pre[1][i][j-1],a[now][i][j]);
                //cout<<"pre["<<i<<"]["<<j<<"]="<<pre[1][i][j]<<endl;
            }
            REP(j,w,1){
                suf[0][i][j]=min(suf[0][i][j+1],a[now][i][j]);
                suf[1][i][j]=max(suf[1][i][j+1],a[now][i][j]);
                //cout<<"suf["<<i<<"]["<<j<<"]="<<suf[1][i][j]<<endl;
            }
        }
        int tmp=w,mi=INF,mx=0,lm=INF;
        FOR(x,1,h+1){
            while(tmp>0&&pre[1][x][tmp]>minn+k){
                tmp--;
            }
            lm=min(lm,pre[0][x][tmp]);
            mi=min(mi,suf[0][x][tmp+1]);
            mx=max(mx,suf[1][x][tmp+1]);
            //cout<<"mx="<<mx<<" mi="<<mi<<" lm="<<lm<<" tmp="<<tmp<<endl;
            if(mx-mi>k){
                ok=0; break;
            }
        }
        if(lm!=minn){
            ok=0;
        }
        if(ok){
            return 1;
        }
        turn(now^1); now^=1;
    }
    return 0;
}

signed main(){
    AC;
    cin>>h>>w;
    FOR(i,1,h+1)FOR(j,1,w+1){
        cin>>a[0][i][j]; minn=min(minn,a[0][i][j]);
        
    }
    
    int l=0,r=1e9+1,ans=INF;
    
    while(l<r){
        int mid=(l+r)>>1;
        if(check(mid)){
            r=mid; ans=min(ans,mid);
        }
        else{
            l=mid+1;
        }
    }
    cout<<ans<<endl;
}

 
/*
 4 5
 1 2 4 4
 1 3 2 1
 4 3 1 2
 4 1 6 1
 2 4 2 5
 
 */

Compilation message

joioi.cpp: In function 'void file()':
joioi.cpp:44:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |     freopen("/Users/liaoyunyang/Desktop/meta_in.txt","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
joioi.cpp:45:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   45 |     freopen("/Users/liaoyunyang/Desktop/meta_out.txt","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct

Subtask #2
45.0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 3 ms 5332 KB Output is correct
16 Correct 11 ms 6996 KB Output is correct
17 Correct 22 ms 7068 KB Output is correct
18 Correct 30 ms 6992 KB Output is correct
19 Correct 24 ms 6996 KB Output is correct
20 Correct 33 ms 6952 KB Output is correct
21 Correct 41 ms 7044 KB Output is correct
22 Correct 42 ms 7056 KB Output is correct
23 Correct 27 ms 7060 KB Output is correct
24 Correct 36 ms 6996 KB Output is correct
25 Correct 31 ms 7040 KB Output is correct
26 Correct 32 ms 6996 KB Output is correct
27 Correct 41 ms 7044 KB Output is correct
28 Correct 45 ms 7048 KB Output is correct

Subtask #3
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 468 KB Output is correct
2 Correct 1 ms 468 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 468 KB Output is correct
11 Correct 1 ms 468 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 3 ms 5332 KB Output is correct
16 Correct 11 ms 6996 KB Output is correct
17 Correct 22 ms 7068 KB Output is correct
18 Correct 30 ms 6992 KB Output is correct
19 Correct 24 ms 6996 KB Output is correct
20 Correct 33 ms 6952 KB Output is correct
21 Correct 41 ms 7044 KB Output is correct
22 Correct 42 ms 7056 KB Output is correct
23 Correct 27 ms 7060 KB Output is correct
24 Correct 36 ms 6996 KB Output is correct
25 Correct 31 ms 7040 KB Output is correct
26 Correct 32 ms 6996 KB Output is correct
27 Correct 41 ms 7044 KB Output is correct
28 Correct 45 ms 7048 KB Output is correct
29 Execution timed out 4078 ms 188636 KB Time limit exceeded
30 Halted 0 ms 0 KB -