Compilare: main.c: In function 'path_cost': main.c:54:9: warning: unused variable 'min_cost' [-Wunused-variable] int min_cost = 0; ^~~~~~~~ main.c:125:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.c: In function 'main': main.c:129:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("padure.in", "r", stdin); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:130:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("padure.out", "w", stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:133:5: 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:137:13: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &(forest[i][j])); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c: In function 'q_pop': main.c:30:12: warning: 'element' may be used uninitialized in this function [-Wmaybe-uninitialized] return element; ^~~~~~~ main.c: In function 'q_min': main.c:12:19: warning: 'element' may be used uninitialized in this function [-Wmaybe-uninitialized] q[1][q2_it++] = y; ~~~~~~~~~~~~~~^~~ main.c:24:9: note: 'element' was declared here int element; ^~~~~~~ main.c:13:19: warning: 'element' may be used uninitialized in this function [-Wmaybe-uninitialized] q[1][q2_it++] = x; ~~~~~~~~~~~~~~^~~ main.c:24:9: note: 'element' was declared here int element; ^~~~~~~ main.c: In function 'path_cost': main.c:62:31: warning: 'element' may be used uninitialized in this function [-Wmaybe-uninitialized] return costs[line][column]; ~~~~~~~~~~~^~~~~~~~ main.c:62:31: warning: 'element' may be used uninitialized in this function [-Wmaybe-uninitialized]