Submission #285226

# Submission time Handle Problem Language Result Execution time Memory
285226 2020-08-28T12:12:48 Z CaroLinda Sailing Race (CEOI12_race) C++14
55 / 100
3000 ms 4984 KB
#include <bits/stdc++.h>

#define sz(x) (int)x.size()
#define mkt make_tuple
#define lp(i,a,b) for(int i = a ; i < b ; i++ )
#define ff first
#define ss second
#define eb push_back
#define ll long long
#define mk make_pair
#define pii pair<int,int>
#define debug printf
#define all(x) x.begin(),x.end()

const int MAXN = 510 ;

using namespace std ;

int N , K , ans, curId ;
int t[2] = {-1,1} ;
int dp[MAXN][MAXN][2] , dpLinha[MAXN][MAXN][2] ;
vector<int> adj[MAXN] ;
vector<pii> edge ;

bool isInside(int x, int L , int R , int type )
{

    if(type == -1) swap(L,R) ;

    if( L > R ) return (L <= x || x <= R ) ;
    return L <= x && x <= R ;

}

void solve()
{
    lp(i,0,N) dpLinha[i][i][0] = dpLinha[i][i][1] = 1 ;

    for(int diff = 1 ; diff < N ; diff++ )
        for(int i = 0 ; i < N ; i++ )
            for(int j = 0 ; j < 2 ; j++ )
            {
                int R = ( i + diff * t[j] + N ) % N ;
                int &ptr = dp[i][R][j] ;
                ptr = 0 ;

                for(int viz : adj[i] )
                {
                    if(!isInside(viz, i , R, t[j] ) ) continue ;

                    ptr = max(ptr, 1 + dp[viz][R][j] ) ;
                    ptr = max(ptr, 1 + dp[viz][ (i+t[j]+N)%N ][ !j ] ) ;

                    if( dpLinha[viz][R][j] ) dpLinha[i][R][j] = max( dpLinha[i][R][j] , 1 + dpLinha[viz][R][j] ) ;

                }

                if(ptr  > ans )
                {
                    ans = ptr ;
                    curId = i ;
                }
            }
    lp(i,0,N)
        lp(j,0,N)
            lp(g,0,2)
                if(dpLinha[i][j][g]) dpLinha[i][j][g]-- ;
}

int main()
{
    scanf("%d%d", &N , &K ) ;
    for(int i = 0 , x ; i < N ; i++ )
        while( scanf("%d", &x) && x != 0 )
        {
            adj[i].push_back(x-1) ;
            edge.push_back( mk( i , x-1 ) ) ;
        }

    solve() ;

    if(K == 0)
    {
        printf("%d %d\n" , ans, curId + 1 );
        return 0 ;
    }

   /* for(int i = 0 ; i < N ; i++ )
    {
        for(int j = 0 ; j < N ; j++ )
            for(int g = 0 ; g < 2 ; g++ )
            {
                printf("dp[%d][%d][%d] = %d\n", i , j , g , dp[i][j][g] ) ;
            }
    } */

    for(int i = 0 ; i < sz(edge) ; i++ )
        for(int j = i+1 ; j < sz(edge) ; j++ )
        {
            int A = edge[i].ff, B = edge[i].ss ;
            int X = edge[j].ff, Y = edge[j].ss ;

            if( A == X || A == Y || B == X || B == Y ) continue ;
            if( isInside(X, A, B, 1) == isInside(Y, A, B, 1) ) continue ;

            int typeB = isInside(A, Y, B, 1) ? 0 : 1 ;
            int typeA = !typeB ;

            int valY = max( dp[Y][ (B+t[typeA]+N)%N ][typeB] , dp[Y][ (A+t[typeB]+N)%N ][typeA] ) ;
            int valX = dpLinha[B][X][typeB] ;

            //debug("Em %d %d %d %d, valx eh %d e valy eh %d com typeB = %d\n" , A , B , X , Y , valX , valY , typeB ) ;
           // debug("%d %d e %d %d\n", Y, (B+t[typeA]+N)%N, Y , (A+t[typeB]+N)%N ) ;

            if( ans < valY+valX+2 )
            {
                ans = valY+valX+2 ;
                curId = A ;
            }

        }

    printf("%d %d\n" , ans, curId + 1 ) ;

}

Compilation message

race.cpp: In function 'int main()':
race.cpp:72:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   72 |     scanf("%d%d", &N , &K ) ;
      |     ~~~~~^~~~~~~~~~~~~~~~~~
# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Incorrect 1 ms 512 KB Output isn't correct
3 Incorrect 1 ms 512 KB Output isn't correct
4 Correct 2 ms 640 KB Output is correct
5 Correct 1 ms 768 KB Output is correct
6 Correct 5 ms 768 KB Output is correct
7 Correct 4 ms 896 KB Output is correct
8 Incorrect 6 ms 1024 KB Output isn't correct
9 Correct 5 ms 1152 KB Output is correct
10 Correct 12 ms 1328 KB Output is correct
11 Correct 7 ms 1280 KB Output is correct
12 Correct 190 ms 2168 KB Output is correct
13 Incorrect 287 ms 3064 KB Output isn't correct
14 Correct 82 ms 3712 KB Output is correct
15 Execution timed out 3056 ms 4732 KB Time limit exceeded
16 Execution timed out 3070 ms 4856 KB Time limit exceeded
17 Execution timed out 3083 ms 4732 KB Time limit exceeded
18 Correct 108 ms 4508 KB Output is correct
19 Execution timed out 3086 ms 4984 KB Time limit exceeded
20 Execution timed out 3084 ms 4984 KB Time limit exceeded