Compilare: user.cpp: In member function ‘bool maxFlowminCost::ford_bellman(int, int)’: user.cpp:52:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < V[u].size() ; i++){ ^ user.cpp: In function ‘void bfs(int)’: user.cpp:103:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < V[u].size() ; i++){ ^ user.cpp:111:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1 ; i <= V[x].size() ; i++) ^ user.cpp: At global scope: user.cpp:138:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main(){ ^ user.cpp: In function ‘void loadgraph()’: user.cpp:115:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&n,&m,&num_troop,&x); ^ user.cpp:117:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&troop[i]); ^ user.cpp:120:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&u,&v); ^ user.cpp: In function ‘int main()’: user.cpp:139:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("atac.in","r",stdin); ^ user.cpp:140:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("atac.out","w",stdout); ^