piscina.cpp: In function 'void aria(int, int, int, int)': piscina.cpp:53: warning: comparison between signed and unsigned integer expressions piscina.cpp: In function 'int main()': piscina.cpp:79: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result piscina.cpp:85: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result