#include <bits/stdc++.h> #define fr first #define sc second #define pb push_back #define mk make_pair #define all(s) s.begin(),s.end() //#define int long long using namespace std; const int N = (3e5 + 12); const int mod = (1e9 + 7); const int INF = (0x3f3f3f3f); pair<int,pair<int,int > > a[N]; multiset<int > st; int pr[N], sf[N]; main() { int n, m, s, sum = 0; scanf("%d%d%d", &n, &m, &s); for(int i = 1;i <= n; i++){ scanf("%d%d", &a[i].sc.fr, &a[i].sc.sc); a[i].fr = a[i].sc.sc - a[i].sc.fr; } sort(a + 1,a + 1 + n); for(int i = 1;i <= n; i++){ sum += a[i].sc.fr; st.insert(a[i].sc.fr); if(i > m){ sum -= *st.begin(); st.erase(st.begin()); } pr[i] = sum; } st.clear(); sum = 0; for(int i = n;i >= 1; i--){ sum += a[i].sc.sc; st.insert(a[i].sc.sc); if(i <= n - s){ sum -= *st.begin(); st.erase(st.begin()); } sf[i] = sum; } int ans = 0; for(int i = max(1, m);i <= n - s; i++){ ans = max(ans, pr[i] + sf[i + 1]); } cout << ans; }

school.cpp:20:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^
school.cpp: In function 'int main()':
school.cpp:23:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d", &n, &m, &s);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
school.cpp:25:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &a[i].sc.fr, &a[i].sc.sc);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~