Compilare: main.cpp: In function 'int main()': main.cpp:49:13: warning: unused variable 'sir' [-Wunused-variable] int sir[4]; ^~~ main.cpp:32:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d", &s, &n); ^ main.cpp:35:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &a[i][j]); ^