Compilare: main.cpp: In function 'int main()': main.cpp:50:36: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] a[i][strlen(a[i])-1] = NULL; ^~~~ main.cpp:30:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d\n", &cerinta,&n); ^ main.cpp:36:35: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(sir, DIM-2, fin); ^ main.cpp:49:36: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(a[i], DIM-2, fin); ^