题解

#include<bits/stdc++.h>
using namespace std;
int main(){
int n;
char a[55][55];
cin >> n;
for(int i = 1; i <= n; i++){
for(int j =1; j <= n; j++){
a[i][j] = '-';
if(i == j || i + j - 1 == n){
a[i][j] = '+';
}
cout << a[i][j];
}
cout << endl;
}

return 0;

}