Compilare: main.cpp: In instantiation of 'std::pair<_T1, _T2> mcSFlow<flow_t, cost_t>::minCostMaxFlow() [with bool use_look_ahead = true; flow_t = long long int; cost_t = long long int]': main.cpp:227:30: required from here main.cpp:176:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (cur[u] == G[u].size()) main.cpp: In instantiation of 'flow_t mcSFlow<flow_t, cost_t>::max_flow() [with flow_t = long long int; cost_t = long long int]': main.cpp:156:28: required from 'std::pair<_T1, _T2> mcSFlow<flow_t, cost_t>::minCostMaxFlow() [with bool use_look_ahead = true; flow_t = long long int; cost_t = long long int]' main.cpp:227:30: required from here main.cpp:95:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (cur[u] == G[u].size()) { main.cpp:97:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[u].size(); ++i) { main.cpp: In instantiation of 'void mcSFlow<flow_t, cost_t>::relabel(int) [with flow_t = long long int; cost_t = long long int]': main.cpp:177:14: required from 'std::pair<_T1, _T2> mcSFlow<flow_t, cost_t>::minCostMaxFlow() [with bool use_look_ahead = true; flow_t = long long int; cost_t = long long int]' main.cpp:227:30: required from here main.cpp:139:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[vertex].size(); ++i) { main.cpp: In function 'int main()': main.cpp:217:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.in", "r", stdin); ^ main.cpp:218:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.out", "w", stdout); ^