#include <iostream> #include <cstring> #include <cstdio> #include <string> using namespace std; #define SZ (1e6 + 5) char str[(int)(1e6 + 5)]; int main() { int n,i,len,m,curlen=0,maxlen=-1,charc=0,j,startpos=0; //charc - no of unique char //maxlen - ans //curlen - cur string len //startpos - of current string cin>>m; while(m){ scanf(" %[^\n]s",str); charc =0;curlen =0 ; maxlen = -1; startpos = 0; len = strlen(str); int hash[300]; for(i=0;i<300;i++) hash[i] = -1; for(i=0;i<len;i++) { if(charc<m || hash[str[i]- 0]!=-1) { curlen++; if(hash[str[i]-0]==-1) charc++; hash[str[i]-0] = i; //cout<<str[i]<<" "<<hash[str[i] - 0]<<charc<<" "<<curlen<<endl; } else { maxlen = maxlen < curlen ? curlen : maxlen ; while(hash[str[startpos] -0]!=startpos) { curlen--; startpos++; } hash[str[startpos] - 0] =-1; curlen--; charc--; startpos++; } } maxlen = maxlen < curlen ? curlen : maxlen ; cout<<maxlen<<endl; cin>>m; } return 0; }
Standard input is empty
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