Compilare: main.cpp: In function 'int main()': main.cpp:42:32: 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:52:36: 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:116:13: warning: 'dest' may be used uninitialized in this function [-Wmaybe-uninitialized] int dest; ^~~~ main.cpp:114:21: warning: 'nod' may be used uninitialized in this function [-Wmaybe-uninitialized] extra[nod]++; ^