Compilare: user.cpp: In function ‘bool my_cmp(std::string, std::string)’: user.cpp:18:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(val[a[i]] < val[b[i]]) ^ user.cpp:18:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(val[a[i]] < val[b[i]]) ^ user.cpp:20:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(val[a[i]] > val[b[i]]) ^ user.cpp:20:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(val[a[i]] > val[b[i]]) ^ user.cpp: In function ‘int main()’: user.cpp:30:19: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[20]’ [-Wformat=] scanf("%s", &S); ^ user.cpp:32:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] val[S[i]] = i + 1; ^ user.cpp:38:27: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[20]’ [-Wformat=] scanf("%s", &S); ^ user.cpp:54:27: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[20]’ [-Wformat=] scanf("%s", &S); ^ user.cpp:26:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zimeria.in", "r", stdin); ^ user.cpp:27:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zimeria.out", "w", stdout); ^ user.cpp:29:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &t, &N); ^ user.cpp:30:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", &S); ^ user.cpp:38:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", &S); ^ user.cpp:54:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", &S); ^