正紧代码上：
#include<bits/stdc++.h>
using namespace std;
int main() {
    int n=0;
    cin>>n;
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            if(i==j||i+j==n-1){
                cout<<"+";
            }
            else{
                cout<<"-";
            } 
        }
        cout<<endl;
    }
     return 0;
}

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止

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