Compilare: user.cpp: In function ‘void bfs(int, int*, int*)’: user.cpp:20:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[k].size();j++) { ^ user.cpp:15:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j,k; ^ user.cpp: In function ‘void solve2(int, int)’: user.cpp:47:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v[k].size();i++) ^ user.cpp: In function ‘void solve(int, int)’: user.cpp:61:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v[k].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:69:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,k,x,y; ^ user.cpp:69:13: warning: unused variable ‘k’ [-Wunused-variable] int i,j,k,x,y; ^ user.cpp:70:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("path2.in","r",stdin); ^ user.cpp:71:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("path2.out","w",stdout); ^ user.cpp:72:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&n,&m,&p,&q); ^ user.cpp:75:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^