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 # include & lt; Iostream> 
#include  

Void FindNearestNumber (STD: : vector & VecNearestPos, const STD: : vector & VecSourse) 
{
VecNearestPos. The clear (); 

Size_t nSize=vecSourse. The size (); 
If (nSize & gt; 1) 
{
VecNearestPos={0, 1}; 
Int nDis=fabs (vecSourse [0] - vecSourse [1]). 
For (size_t I=0; I & lt; NSize - 1; I++) 
{
For (size_t j=I + 1; J & lt; NSize; J++) 
{
If (fabs (vecSourse [I] - vecSourse [j]) & lt; NDis) 
{
VecNearestPos [0]=I; 
VecNearestPos [1]=j; 
NDis=fabs (vecSourse [I] - vecSourse [j]); 
} 
} 
} 
} 
} 

Int main () 
{
STD: : vector VecTest={66, 83, 31, 16, 22, 79}; 

STD: : vector VecPos; 
FindNearestNumber (vecPos vecTest); 

If (2==vecPos. The size () 
{
STD: : cout & lt; <"The first" & lt; } 
The else 
{
STD: : cout & lt; <"Didn't find meet the requirements for" & lt; } 
system("pause"); 
return 0; 
}