Compilare: main.cpp: In function 'int main()': main.cpp:57:33: 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:59:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &nr ) ; ^ main.cpp:64:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &val[i] ) ; ^ main.cpp:71:35: 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: In function 'void dfs2(int, int, int)': main.cpp:42:7: warning: 'p1' may be used uninitialized in this function [-Wmaybe-uninitialized] if (p1 != elem ) ^~