Compilare: main.c: In function 'createHeap': main.c:40:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.c: In function 'main': main.c:161:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &N, &M); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:165:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &v1, &v2, &cost); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~