Compilare: user.cpp: In function ‘int main()’: user.cpp:50:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < g[i].size(); j++) ^ user.cpp:65:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[node.first].size(); i++) ^ user.cpp:90:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[source].size(); i++) ^ user.cpp:24:38: 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); ^ user.cpp:25:40: 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); ^ user.cpp:27:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:31:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &c); ^ user.cpp:91:46: warning: ‘source’ may be used uninitialized in this function [-Wmaybe-uninitialized] flowmax += flow[source][g[source][i]]; ^ user.cpp:77:48: warning: ‘destination’ may be used uninitialized in this function [-Wmaybe-uninitialized] dad[destination] = next; ^