Compilare: main.cpp: In function 'void init()': main.cpp:77:16: warning: operation on 'anc[i]' may be undefined [-Wsequence-point] anc[i] = cost[i] = anc[i] = sum[i] = 0; ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:83:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &T); ^ main.cpp:86:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &nrChains); ^ main.cpp:91:40: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &u, &v, &c); ^