SRM556 Div2 Easy(250) ChocolateBar
ChocolateBar
#include <string> #include <set> using namespace std; class ChocolateBar{public: int maxLength( string letters ) { int n = (int)letters.size(); for ( int w=n; w>0; w-- ) for ( int i=0; i<=n-w; i++ ) if ( int(set<char>(letters.begin()+i,letters.begin()+i+w).size())==w ) return w; return -1; }};