SRM195 (div.2) 250point
やるだけ
#include <cstdio> #include <iostream> #include <algorithm> #include <vector> using namespace std; class Rounder{ public: int round(int n, int b){ int ans = 0; int flag = 0; int nau = 0; int sa = n; while(flag <= 2){ nau += b; if(sa >= abs(n-nau)){ sa = abs(n-nau); ans = nau; } if(nau > n) flag++; } return ans; } };