This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define fastIO ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
#define FF first
#define SS second
#define pb push_back
#define sz(x) (int)x.size()
#define oo 1e9
#define PI acos(-1.0)
#define lb lower_bound
#define ub upper_bound
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> ii;
typedef pair<ii, ii> Li;
const int N = 1e6+7, M=1e7+7;
const int MOD = 1e9+7;
int n, m, k, t;
int h[M];
signed main() {
//freopen("test.inp", "r", stdin);
//freopen("test.out", "w", stdout);
//fastIO;
scanf("%d", &n);int x, y;ll ans=0;
memset(h, 0, sizeof h);
for(int i=1;i<=n;i++) {
scanf("%d%d", &x, &y);
h[y>>1]=max(0, x);
}
for(int mx=0, i=M-1;i>0;i--)
mx=max(h[i], mx), ans+=2*mx;
printf("%lld", ans);
return 0;
}
/* stuff you should look for
- int overflow, array bounds
- special cases (n=1?)
- do smth instead of do nothing and stay organized
- WRITE STUFF DOWN
- DONT JUST STICK ON ONE APPROACH
*/
Compilation message (stderr)
unija.cpp: In function 'int main()':
unija.cpp:27:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
27 | scanf("%d", &n);int x, y;ll ans=0;
| ~~~~~^~~~~~~~~~
unija.cpp:30:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
30 | scanf("%d%d", &x, &y);
| ~~~~~^~~~~~~~~~~~~~~~
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