Compilare: main.cpp: In function 'int bfs()': main.cpp:33:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < g[from].size(); ++ k) { ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int dfs(int, int)': main.cpp:59:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = rem[from]; k < g[from].size(); ++ k) { ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:108:45: warning: narrowing conversion of 'g[j].std::vector<_Tp, _Alloc>::size<Muchie, std::allocator<Muchie> >()' from 'std::vector<Muchie>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] g[i].push_back({j, g[j].size(), cap[i][j], 0}); ~~~~~~~~~^~ main.cpp:109:48: warning: narrowing conversion of '(g[i].std::vector<_Tp, _Alloc>::size<Muchie, std::allocator<Muchie> >() - 1ul)' from 'std::vector<Muchie>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] g[j].push_back({i, g[i].size() - 1, cap[j][i], 0}); ~~~~~~~~~~~~^~~ main.cpp:92:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.in", "r", stdin); ^ main.cpp:93:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("maxflow.out", "w", stdout); ^ main.cpp:95:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:101:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &c); ^