http://poj.org/problem?id=2817 #include <stdio.h> #include <memory.h> #include <string.h> int ans[12][1024][10]; int link[10][10]; int len[10]; char w[10][20]; int join_num( int i, int j ) { int k, l, ans = 0, h; for( k=0; w[i][k]; k++ ) { for( l=0, h=0; w[i][k+l] && w[j][l]; l++ ) h += ( w[i][k+l] == w[j][l] ); if( ans < h ) ans = h; } for( k=0; w[j][k]; k++ ) { for( l=0, h=0; w[j][k+l] && w[i][l]; l++ ) h += ( w[j][k+l] == w[i][l] ); if( ans < h ) ans = h; } return ans; } int main( ) { int n, i, j, k, m, l, answer, t; while( 1 ) { scanf( "%d", &n ); if( n <= 0 ) break; for( i=0; i<n; i++ ) { scanf( "%s", w[i] ); len[i] = strlen( w[i] ); } k = 0; for( j=0; j<n; j++ ) for( i=j+1; i<n; i++ ) link[i][j] = link[j][i] = join_num( i, j ); memset( ans, -1, sizeof ans ); for( i=0; i<n; i++ ) ans[1][1<<i][i] = 0; m = (1<<n); answer = 10000; for( i=1; i<n; i++ ) for( j=0; j<m; j++ ) for( k=0; k<n; k++ ) { if( ans[i][j][k] >= 0 ) { for( l=0; l<n; l++ ) if( !( j & (1<<l) ) ) { t = ( j | (1<<l) ); if( ans[i+1][t][l] < 0 || ans[i+1][t][l] < ans[i][j][k]+link[k][l] ){ ans[i+1][t][l] = ans[i][j][k]+link[k][l]; } } } } answer = 0; for( j=0; j<m; j++ ) for( k=0; k<n; k++ ) if( ans[n][j][k] > answer ) answer = ans[n][j][k]; printf( "%dn", answer ); } return 0; }
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