Compilare: main.c: In function 'main': main.c:73:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&n,&m,&H); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:76:7: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&mat[i][j]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~