Compilare: user.cpp: In function ‘int main()’: user.cpp:13:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:17:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &a[i]); ^ user.cpp:61:5: warning: ‘p2’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i = n - 1; s != p2; --i) ^ user.cpp:55:5: warning: ‘p1’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i = 0; s != p1; ++i) { ^