zoj3160 DP

将自己历史的AC共享

zoj3160 DP题

dp[i][j] = max(dp[i][k]+dp[k+1][j]) i<=k

//1768666 2009-02-21 17:42:40 Accepted  3160 C++ 70 904 green tea #include <cstdio>#include <algorithm>using namespace std;int flag[305][305], dp[305][305], a[305];int main(){    int n, m, i, j, k, x, y;    while ( scanf("%d%d", &n, &m) != EOF ) {        memset(flag, 0, sizeof(flag));        for ( i = 0; i < m; ++i ) {            scanf("%d%d", &x, &y);            flag[x][y] = flag[y][x] = 1;        }        for ( i = 0; i < n; ++i )            scanf("%d", &a[i]);        memset(dp, 0, sizeof(dp));        for ( i = 1; i < n; ++i )            for ( j = 0; i+j < n; ++j ) {                int u = i+j;                if ( dp[j+1][u-1] == u-j-1 && flag[a[j]][a[u]] )                    dp[j][u] = u-j+1;                for ( k = j; k < u; ++k )                    if ( dp[j][k] + dp[k+1][u] > dp[j][u] )                        dp[j][u] = dp[j][k] + dp[k+1][u];            }        printf("%d\n", dp[0][n-1]);    }    return 0;}

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