Compilare: main.cpp: In function 'int main()': main.cpp:20:18: warning: unused variable 'j' [-Wunused-variable] int n, k, i, j; ^ main.cpp:21:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d", &n, &k); ^ main.cpp:24:28: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(&a[0][2], n, fin); ^ main.cpp:27:28: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(&a[1][2], n, fin); ^