Compilare: main.c: In function 'bkt': main.c:18:10: warning: unused variable 'x' [-Wunused-variable] int s, x; ^ main.c: In function 'main': main.c:39:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:42:7: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &mat[l][c]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~