hdu4403- A very hard Aoshu problem(搜索)
枚举等号的位置,然后暴力搜索一波 这个题本身不难,但它是我第一次使用对拍程序来查找错误,值得纪念。
#include<cstdio>
#include<string.h>
#include<map>
#include<algorithm>
#define inf 0x3f3f3f3f
const int maxn=;
using namespace std;
typedef pair<int,int> P;
int len,d,b,c,ans;
char a[maxn+];
map<P,int> m1,m2;
int cal(int l,int r){
if(l>r) return ;
int res=;
for(int i=l;i<=r;i++){
res=res*+a[i]-'';
}
return res;
}
void dfs(int l,int r,int sum,int f,int eq){
if(!f){
if(l>r){
m1[P(sum,eq)]++;
return ;
}
for(int i=l;i<=r;i++){
dfs(i+,r,sum+cal(l,i),,eq);
}
} else {
if(l>r){
m2[P(sum,eq)]++;
return ;
}
for(int i=l;i<=r;i++){
dfs(i+,r,sum+cal(l,i),,eq);
}
}
}
int main()
{
// freopen("e://duipai//data.txt","r",stdin);
// freopen("e://duipai//out1.txt","w",stdout);
while(scanf("%s",a)!=EOF){
if(a[]=='E')
break;
len=strlen(a);
ans=;
for(int i=;i<len;i++){
m1.clear();
dfs(,i-,,,i);
m2.clear();
dfs(i,len-,,,i);
map<P,int>::iterator it=m1.begin();
for(;it!=m1.end();++it){
int a=m1[P((*it).first.first,(*it).first.second)];
int b=m2[P((*it).first.first,(*it).first.second)];
if(a&&b) {
ans+=(a*b);
}
}
}
printf("%d\n",ans);
}
return ;
}
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