Compilare: user.cpp: In function ‘int main()’: user.cpp:14:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d %d", &n, &m); ^ user.cpp:16:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &dp[i][0]); ^ user.cpp:29:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d %d", &q, &p); ^ user.cpp:24:32: warning: iteration 1u invokes undefined behavior [-Waggressive-loop-optimizations] put2[i] = 2 * put2[i-1]; ^ user.cpp:23:5: note: containing loop for (i = 1; i <= 19; i++) ^