Submission #265106

#	Time	Username	Problem	Language	Result	Execution time	Memory
265106		TadijaSebez	Sailing Race (CEOI12_race)	C++11	40 / 100	347 ms	3152 KiB

race

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
void ckmx(int&x,int y){x=max(x,y);}
const int N=505;
vector<int> E[N];
int dp[N][N][2],n;
bool was[N][N][2];
int DP(int l,int r,int side){
	if(was[l][r][side])return dp[l][r][side];
	int u=side==0?l:r;
	was[l][r][side]=1;
	int L=side==0?(l==n?1:l+1):l;
	int R=side==1?(r==1?n:r-1):r;
	for(int v:E[u]){
		if((l<=r&&l<=v&&r>=v)||(l>r&&(v<=r||v>=l))){
			ckmx(dp[l][r][side],1+max(DP(L,v,1),DP(v,R,0)));
		}
	}
	return dp[l][r][side];
}
int main(){
	scanf("%i %*i",&n);
	for(int i=1;i<=n;i++){
		while(1){
			int j;
			scanf("%i",&j);
			if(j==0)break;
			E[i].pb(j);
		}
	}
	int ans=-1,idx=0;
	for(int i=1;i<=n;i++){
		int now=DP(i,i==1?n:i-1,0);
		if(now>ans)ans=now,idx=i;
	}
	printf("%i\n%i\n",ans,idx);
	return 0;
}

Compilation message (stderr)

race.cpp: In function 'int main()':
race.cpp:23:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   23 |  scanf("%i %*i",&n);
      |  ~~~~~^~~~~~~~~~~~~
race.cpp:27:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   27 |    scanf("%i",&j);
      |    ~~~~~^~~~~~~~~

• Subtask 1: 40 / 100