Compilare: user.cpp: In function ‘int main()’: user.cpp:66:10: warning: unused variable ‘c’ [-Wunused-variable] char c; ^ user.cpp:63:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d\n", &n, &m); ^ user.cpp:69:35: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(cuv[i],LENGTH+1, in); ^ user.cpp:101:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%c\n", &query[i]); ^