foo.cc:27:1: error: 'unorder_map' does not name a type
 unorder_map<char, int> cnt;
 ^~~~~~~~~~~
foo.cc: In function 'void solve()':
foo.cc:40:32: error: 'cnt' was not declared in this scope
     for(int i = 0; i < n; i++) cnt[str[i]]++;
                                ^~~
foo.cc:40:32: note: suggested alternative: 'int'
     for(int i = 0; i < n; i++) cnt[str[i]]++;
                                ^~~
                                int
foo.cc:41:19: error: 'cnt' was not declared in this scope
     for(auto &x : cnt) {
                   ^~~
foo.cc:41:19: note: suggested alternative: 'int'
     for(auto &x : cnt) {
                   ^~~
                   int

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