Submission #145272

#	Time	Username	Problem	Language	Result	Execution time	Memory
145272		TadijaSebez	Coin Collecting (JOI19_ho_t4)	C++11	37 / 100	49 ms	3576 KiB

joi2019_ho_t4

#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int N=100050;
const int M=2050;
const int inf=1e9+7;
int pos[2][M],sz[2],cnt[N][2],dp[M],tmp[M];
void Clear(int a[]){ for(int i=0;i<M;i++) a[i]=inf;}
void ckmn(int &a, int b){ a=min(a,b);}
int main()
{
	int n,x,y;
	scanf("%i",&n);
	ll ans=0;
	for(int i=1;i<=2*n;i++)
	{
		scanf("%i %i",&x,&y);
		if(x<1) ans+=1-x,x=1;
		if(x>n) ans+=x-n,x=n;
		if(y<1) ans+=1-y,y=1;
		if(y>2) ans+=y-2,y=2;
		cnt[x][y-1]++;
	}
	for(int i=n;i>=1;i--)
	{
		for(int k=1;k<=cnt[i][0];k++) pos[0][++sz[0]]=i;
		for(int k=1;k<=cnt[i][1];k++) pos[1][++sz[1]]=i;
	}
	Clear(dp);
	if(sz[0]) dp[sz[0]-1]=pos[0][sz[0]]-1;
	if(sz[1]) dp[sz[0]]=pos[1][sz[1]];
	for(int i=2,l=1;i<=2*n;i++)
	{
		Clear(tmp);
		int f=0;
		if(i%2==0) f=1;
		for(int j=0;j<=sz[0];j++) if(dp[j]!=inf)
		{
			int k=2*n-i-j+1;
			if(j) ckmn(tmp[j-1],dp[j]+abs(pos[0][j]-l)+f);
			if(k) ckmn(tmp[j],dp[j]+abs(pos[1][k]-l)+(f^1));
		}
		for(int j=0;j<=sz[0];j++) dp[j]=tmp[j];
		if(i%2==0) l++;
	}
	ans+=dp[0];
	printf("%lld\n",ans);
	return 0;
}

Compilation message (stderr)

joi2019_ho_t4.cpp: In function 'int main()':
joi2019_ho_t4.cpp:13:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i",&n);
  ~~~~~^~~~~~~~~
joi2019_ho_t4.cpp:17:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%i %i",&x,&y);
   ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 29 / 29
• Subtask 3: 0 / 63