Compilare: user.cpp: In function ‘int main()’: user.cpp:38:32: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[17]’ [-Wformat=] fscanf(f,"%s",&s[i]); ^ user.cpp:40:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<strlen(s[i]);j++) c[s[i][j]-'a']++; ^ user.cpp:47:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<strlen(s[i]);j++) { ^ user.cpp:35:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d\n",&n); ^ user.cpp:38:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%s",&s[i]); ^