#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char str[110];
int dp[110][110], path[110][110], n;
void solve(){
memset( dp, 0, sizeof(dp) );
for( int i= 0; i<= n; ++i ) dp[i][i]= 1;
for( int p= 1; p< n; ++p )
for( int i= 0; i< n- p; ++i )
{
int j= i+ p; dp[i][j]= 1<<30;
if( str[i]== '(' && str[j]== ')' ||
str[i]== '[' && str[j]== ']' &&
dp[i+1][j-1]< dp[i][j] ){
dp[i][j]= dp[i+1][j-1];
path[i][j]= -1; }
if( ( str[i]== '(' || str[i]== '[' ) &&
dp[i+1][j]+ 1< dp[i][j] ){
dp[i][j]= dp[i+1][j]+ 1;
path[i][j]= -2; }
if( ( str[j]== ')' || str[j]== ']' ) &&
dp[i][j-1]+ 1< dp[i][j] ){
dp[i][j]= dp[i][j-1]+ 1;
path[i][j]= -3; }
for( int k= i; k< j; ++k )
if( dp[i][k]+ dp[k+1][j]< dp[i][j] ){
dp[i][j]= dp[i][k]+ dp[k+1][j];
path[i][j]= k; }
}
}
void print( int l, int r ){
if( l> r ) return;
if( l== r ){
if(str[l]=='(' || str[l]== ')')printf("()");
else printf("[]"); }
else if( path[l][r]== -1 ){
printf("%c",str[l]);
print(l+1,r-1);
printf("%c",str[r]); }
else if( path[l][r]== -2 ){
printf("%c",str[l]);
print(l+1,r);
if( str[l]== '(' ) printf(")");
else printf("]"); }
else if( path[l][r]== -3 ){
if( str[r]== ')' ) printf("(");
else printf("[");
print(l,r-1);
printf("%c",str[r] );
}
else{
print( l, path[l][r] );
print( path[l][r]+ 1, r ); }
}
int main(){
while( gets(str)!= NULL ){
if( strlen(str)== 0 ){
puts(""); continue; }
n= strlen(str);
solve();
print(0,n-1); puts("");
}
return 0; }
posted on 2008-11-06 12:25
Darren 阅读(385)
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