Compilare: main.cpp: In function 'int main()': main.cpp:42:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d%d\n", &p, &n, &m) ; ^ main.cpp:103:55: warning: 'p2' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf (fout, "%d %d\n%c", p1, p2, 'a'+mat[p1][p2] ) ; ~~~~~~~~~~^ main.cpp:103:55: warning: 'p1' may be used uninitialized in this function [-Wmaybe-uninitialized]