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- #include<bits/stdc++.h>
- using namespace std;
- int main() {
- long long int l;
- while(scanf("%lld%*c", &l)!=0) {
- if(l==0) break;
- int i, ld=-l, lr=-l, min_d=l;
- char str[l+1];
- scanf("%s", &str);
- for(i=0; i<l; i++) {
- if(str[i]=='Z') {
- min_d=0;
- break;
- }
- else if(str[i]=='R') {
- if(i-ld<min_d) min_d=i-ld;
- lr=i;
- }
- else if(str[i]=='D') {
- if(i-lr<min_d) min_d=i-lr;
- ld=i;
- }
- }
- printf("%d\n", min_d);
- }
- return 0;
- }
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