Compilare: main.c: In function 'main': main.c:57:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(input, "%d%d", &n, &m); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:67:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(input, "%d %d %d", &e[i].source, &e[i].dest, &e[i].cost); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~