Compilare: main.cpp: In function 'int main()': main.cpp:94:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("smart.in", "r", stdin); ^ main.cpp:95:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("smart.out", "w", stdout); ^ main.cpp:121:25: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized] h -= flowGraph.maxFlow(0, t * nr + d); ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp:25:45: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized] to(_to), next(_next), cap(_cap), flo(_flo) {} ^ main.cpp:96:17: note: 's' was declared here int n, nr = 0, s, d, k; cin >> n >> k; ^