#include<bits/stdc++.h> using namespace std; const int N = 1e5 + 10; const int INF = 0x3f3f3f3f; int a[] = {7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2}; char b[] = {'1','0','X','9','8','7','6','5','4','3','2'}; int main() { int n,ans =0; string s; cin >> n; getline(cin,s); int len=s.size(); for(int i = 0; i <len-1;i++) { ans +=(s[i]-'0') * a[i]; } ans%= 11; if(b[ans]==s[17]) { cout << "True" <<endl; } else{ cout << "False" << endl; } return 0; } #include<bits/stdc++.h> using namespace std; const int N = 1e5 + 10; const int INF = 0x3f3f3f3f; int a[] = {7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2}; char b[] = {'1','0','X','9','8','7','6','5','4','3','2'}; int main() { int n,ans =0; string s; cin >> n; getline(cin,s); int len=s.size(); for(int i = 0; i <len-1;i++) { ans +=(s[i]-'0') * a[i]; } ans%= 11; if(b[ans]==s[17]) { cout << "True" <<endl; } else{ cout << "False" << endl; } return 0; } 慢慢分行吧