Submission #549732

#	Time	Username	Problem	Language	Result	Execution time	Memory
549732		Pherokung	The Kingdom of JOIOI (JOI17_joioi)	C++14	Compilation error	0 ms	0 KiB

joioi

#include<bits/stdc++.h>
using namespace std;
#define N 2005
#define F first
#define S second
int n,m,A[N][N],a[N][N],dp[N][N],ans=1e9;
typedef pair<int,int> pa;
 
bool valid(int n,int m,int val,int &ans){
    int i,j,mi[2],ma[2];
    bitset<N> dp[N];
    mi[0]=mi[1]=1e9;
    ma[0]=ma[1]=0;
    for(i=0;i<=m;i++)dp[n+1][i]=true;
    for(i=0;i<=n;i++)dp[i]=1;
    for(i=n;i>0;i--)for(j=1;a[i][j]<=val&&dp[i+1][j]&&dp[i][j-1];j++)dp[i][j]=true;
    if(dp[1][m])return true;
    if(!dp[n][1])return false;
    for(i=1;i<=n;i++){
        for(j=1;j<=m;j++){
            mi[dp[i][j]]=min(mi[dp[i][j]],a[i][j]);
            ma[dp[i][j]]=max(ma[dp[i][j]],a[i][j]);
        }
    }
    ans=min(ans,max(ma[0]-mi[0],ma[1]-mi[1]));
    if(mi[1]>=mi[0])return false;
    return ma[1]-mi[1]>ma[0]-mi[0];
}
 
void sol(int n,int m){
	int be = 1,ed = 1e9;
	while(be < ed){
		int mid = (be+ed)/2;
		if(cal(n,m,mid)) ed = mid;
		else be = mid+1;
	}
}
 
int main(){
	scanf("%d%d",&n,&m);
	for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) scanf("%d",&A[i][j]);
	
	for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) a[i][j] = A[i][j];
	sol(n,m);
 
	for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) a[n-i+1][j] = A[i][j];
	sol(n,m);
	
	for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) a[m-j+1][n-i+1] = A[i][j];
	sol(m,n);
	
	for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) a[j][n-i+1] = A[i][j];
	sol(m,n);
	
	printf("%d",ans);
}

Compilation message (stderr)

joioi.cpp: In function 'void sol(int, int)':
joioi.cpp:34:6: error: 'cal' was not declared in this scope
   34 |   if(cal(n,m,mid)) ed = mid;
      |      ^~~
joioi.cpp: In function 'int main()':
joioi.cpp:40:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |  scanf("%d%d",&n,&m);
      |  ~~~~~^~~~~~~~~~~~~~
joioi.cpp:41:51: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |  for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) scanf("%d",&A[i][j]);
      |                                              ~~~~~^~~~~~~~~~~~~~~