Compilare: user.cpp: In function ‘void solve()’: user.cpp:24:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] cnt[a[i]] += 2; ^ user.cpp:25:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] used[a[i]] ++; ^ user.cpp:38:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] --cnt[a[i]]; ^ user.cpp:61:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] --used[ans[i]]; ^ user.cpp:62:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] --cnt[ans[i]]; ^ user.cpp:14:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n", (a+1)); ^ user.cpp: In function ‘int main()’: user.cpp:72:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("laundering.in", "r", stdin); ^ user.cpp:73:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("laundering.out", "w", stdout); ^ user.cpp:78:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &tests); ^