Compilare: main.cpp: In function 'int main()': main.cpp:30:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ main.cpp:38:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &x, &y); ^ main.cpp:65:13: warning: 'dest' may be used uninitialized in this function [-Wmaybe-uninitialized] int dest; ^~~~