Compilare: user.cpp: In function ‘int main()’: user.cpp:17:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] L[s[i]].push_back(i); ^ user.cpp:20:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!L[c].empty()) ^ user.cpp:31:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(seen[c]) continue; ^ user.cpp:32:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(L[c].empty()) continue; ^ user.cpp:33:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] p=L[c].front(); ^ user.cpp:38:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!L[cr].empty() && L[cr].back()>last && L[cr].back()<p) ^ user.cpp:38:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!L[cr].empty() && L[cr].back()>last && L[cr].back()<p) ^ user.cpp:38:63: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!L[cr].empty() && L[cr].back()>last && L[cr].back()<p) ^ user.cpp:47:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] seen[c]=1; ^ user.cpp:49:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] L[c].clear(); ^ user.cpp:52:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!L[cr].empty() && L[cr].front()<=last) L[cr].pop_front(); ^ user.cpp:52:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!L[cr].empty() && L[cr].front()<=last) L[cr].pop_front(); ^ user.cpp:52:70: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!L[cr].empty() && L[cr].front()<=last) L[cr].pop_front(); ^ user.cpp:11:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("calandrinon.in","r",stdin); ^ user.cpp:12:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("calandrinon.out","w",stdout); ^ user.cpp:13:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:14:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]