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#include <iostream> #include <set> #include <map> using namespace std; int main() { int n; cin >> n; string s; cin >> s; map<char, int> mapa; int j = 0; int result = 2e9; for(int i = 0; i < n; i++) { mapa[s[i]]++; int k = mapa[s[i]]; while(mapa[s[j]] > 1) { mapa[s[j]]--; j++; } if(k == 1) { result = i - j + 1; } else { result= min(result, i - j + 1); } } cout << result << endl; return 0; } // 7 //aaBCCee
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