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- #include <cstdio>
- using namespace std;
- int days[101];
- int result;
- int main()
- {
- int n;
- scanf("%d",&n);
- while(n--)
- {
- int a,b;
- scanf("%d%d",&a,&b);
- if(days[a] < b)
- {
- result -= days[a];
- result += b;
- days[a] = b;
- }
- }
- printf("%d",result);
- return 0;
- }
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