Compilare: user.cpp: In function ‘int main()’: user.cpp:87:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[a].size(); i++) ^ user.cpp:64:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,n,m,a,b,c; ^ user.cpp:62:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("in.in","r",stdin); ^ user.cpp:63:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("out.out","w",stdout); ^ user.cpp:65:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:69:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&a,&b,&c); ^