Compilare: main.c: In function 'path_cost': main.c:56:9: warning: unused variable 'min_cost' [-Wunused-variable] int min_cost = 0; ^~~~~~~~ main.c:88:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.c: In function 'main': main.c:92:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("padure.in", "r", stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:93:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("padure.out", "w", stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:96:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d %d %d", &n, &m, &pc, &pl, &cl, &cc); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:100:13: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &(forest[i][j])); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~