Compilare: main.cpp: In function 'int main()': main.cpp:22:26: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &N); ^ main.cpp:24:55: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for (int i=0; i<N; i++) fscanf(fin, "%d", &arr[i]); ^ main.cpp:27:23: warning: 'lastIndex' may be used uninitialized in this function [-Wmaybe-uninitialized] int maxLength=-1, lastIndex; ^~~~~~~~~