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#include <iostream> #include <string> using namespace std; int main() { int n,count = 0; char num; cin >> n; if(n < 1) { cout << 0 << endl; return 0; } for(int i = 0; i < n; i++) { for(int j = 0; j < n; j++) { cin >> num; if(j == n-1 - i || j == i) { count += num-48; } } } cout << count << endl; return 0; }
