Compilare: main.c: In function 'drawGraph': main.c:191:9: warning: unused variable 'j' [-Wunused-variable] int i, j; ^ main.c: In function 'Dijkstra2': main.c:395:6: warning: unused variable 'cost' [-Wunused-variable] int cost; ^~~~ main.c: In function 'main': main.c:452:7: warning: variable 'vertex_array' set but not used [-Wunused-but-set-variable] int *vertex_array; ^~~~~~~~~~~~ main.c:451:22: warning: unused variable 'number' [-Wunused-variable] int i, *array_dist, number; ^~~~~~ main.c:450:19: warning: unused variable 'ch' [-Wunused-variable] char buffer[40], ch; ^~ main.c:449:31: warning: unused variable 'min_index' [-Wunused-variable] int u, v, cost, cap, min, j, min_index; ^~~~~~~~~ main.c:449:28: warning: unused variable 'j' [-Wunused-variable] int u, v, cost, cap, min, j, min_index; ^ main.c:449:23: warning: unused variable 'min' [-Wunused-variable] int u, v, cost, cap, min, j, min_index; ^~~ main.c:449:18: warning: variable 'cap' set but not used [-Wunused-but-set-variable] int u, v, cost, cap, min, j, min_index; ^~~ main.c:448:12: warning: unused variable 'X' [-Wunused-variable] int N, M, X; ^ main.c: In function 'drawGraph': main.c:223:2: warning: ignoring return value of 'system', declared with attribute warn_unused_result [-Wunused-result] system(buffer); ^~~~~~~~~~~~~~ main.c: In function 'main': main.c:456:2: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result] fgets(buffer, 20, fin); ^~~~~~~~~~~~~~~~~~~~~~ main.c:466:3: warning: ignoring return value of 'fgets', declared with attribute warn_unused_result [-Wunused-result] fgets(buffer, 20, fin); ^~~~~~~~~~~~~~~~~~~~~~