by LiJinLin_AFO @ 2024-02-13 19:38:08
by LiJinLin_AFO @ 2024-02-13 19:40:19
您在函数里 return 0 了
by Chenliy @ 2024-02-13 19:55:02
work 函数类型是string
by Chenliy @ 2024-02-13 19:55:26
@[LiJinLin_AFO](/user/755503)
by Chenliy @ 2024-02-13 19:55:46
@[Chenliy](/user/1255395) 感谢大佬的指点，至少不是 RE 了，不过还是一片 WA，希望能再次指点一下，非常感谢！~~（已关）~~
by LiJinLin_AFO @ 2024-02-13 20:09:08
```cpp
#include<iostream>
#include<string>
#include<string.h>
using namespace std;
string ans="1",link;
int c[4005];
inline void reverse(string &x){
string a="";
for(int i=x.size()-1;i>=0;i--) a.push_back(x[i]);
x=a;
}//翻转字符串
inline string ntos(int n){
if(!n) return "";
string s=ntos(n/10);
s.push_back(n%10+'0');
// cout<<" "<<n<<" "<<s.size()<<endl;
return s;
}//将数字按从高位到低位顺序转为字符串
inline void print(){
int n=ans.size()-1;
while(n>=0&&ans[n]=='0') --n;//去除前导零
for(int i=n;i>=0;i--) cout<<ans[i]; cout<<endl;
}//输出高精数字
inline void add(){
string s="";
reverse(link);
int n=max(ans.size(),link.size())+1;
for(int i=ans.size();i<=n;i++) ans.push_back('0');
for(int i=link.size();i<=n;i++) link.push_back('0');
for(int i=0,f=0;i<n||i>=n&&f==1;i++){
int x=ans[i]-'0',y=link[i]-'0';
int z=x+y+f;
if(z>9) z-=10,f=1;
else f=0;
s.push_back(z+'0');
}
ans=s;
//print();
}//高精字符串ans加上字符串link（均为数字）
inline string work(string a,string b){
int n=a.size(),m=b.size();
// for(int i=0;i<n;i++) cout<<a[i]-'0'<<" "; cout<<endl;
// for(int i=0;i<m;i++) cout<<b[i]-'0'<<" "; cout<<endl;
reverse(a),reverse(b);
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
int x=a[i]-'0',y=b[j]-'0';
c[i+j]+=x*y;
}
}
for(int i=0;i<n+m-1;i++){
int yu=c[i]/10;
c[i]%=10;
c[i+1]+=yu;
}
int st=n+m-1;
for(;st>=0&&c[st]==0;st--);
if(st<0){
putchar('0');
exit(0);
}
//for(int i=st;i>=0;i--) cout<<c[i]<<" "; cout<<endl;
string qwert="";
for(int i=st;i>=0;i--) qwert.push_back(c[i]+'0');
memset(c,0,sizeof c);
return qwert;
}//高精乘
int main(){
int n;
scanf("%d",&n);
link=ntos(1);
for(int i=2;i<=n;i++){
for(int j=2;j<=i;j++){
link=work(link,ntos(j));
}
add(),link=ntos(1);
}
print();
return 0;
}
```
改动有些大……
by Chenliy @ 2024-02-13 20:35:41
@[LiJinLin_AFO](/user/755503)
by Chenliy @ 2024-02-13 20:37:17
@[Chenliy](/user/1255395) 感谢大佬！！！
by LiJinLin_AFO @ 2024-02-13 21:06:51