Compilare: main.cpp: In function 'int main()': main.cpp:29:14: warning: unused variable 'k' [-Wunused-variable] int cnt, k; ^ main.cpp:13:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf ( fin, "%d", &n ); ^ main.cpp:15:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf ( fin, "%d", &a ); ^ main.cpp:19:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf ( fin, "%d", &a ); ^