/* AUTHOR: TUAN ANH - BUI */ // ~~ icebear ~~ #include <bits/stdc++.h> using namespace std; typedef long long ll; typedef pair<int, int> ii; typedef pair<int, ii> iii; template<class X, class Y> bool minimize(X &x, const Y &y) { if (x > y) return x = y, true; return false; } template<class X, class Y> bool maximize(X &x, const Y &y) { if (x < y) return x = y, true; return false; } #define FOR(i,a,b) for(int i=(a); i<=(b); ++i) #define FORR(i,a,b) for(int i=(a); i>=(b); --i) #define REP(i, n) for(int i=0; i<(n); ++i) #define RED(i, n) for(int i=(n)-1; i>=0; --i) #define MASK(i) (1LL << (i)) #define BIT(S, i) (((S) >> (i)) & 1) #define mp make_pair #define pb push_back #define fi first #define se second #define all(x) x.begin(), x.end() #define task "icebear" /*END OF TEMPLATE. ICEBEAR AND THE CAT WILL WIN VOI26 */ const int MOD = 1e9 + 7; const int inf = (int)1e9 + 27092008; const ll INF = (ll)1e18 + 27092008; const int N = 3e5 + 5; int n, m, k; ii a[N]; void init(void) { cin >> n >> m >> k; FOR(i, 1, n) cin >> a[i].fi >> a[i].se; } void process(void) { sort(a + 1, a + n + 1, [&](const ii &x, const ii &y){ return x.fi - x.se < y.fi - y.se; }); vector<ll> pf(n + 5, 0), sf(n + 5, 0); priority_queue<int, vector<int>, greater<int>> Q; FOR(i, 1, n) { Q.push(a[i].se); pf[i] = pf[i - 1] + a[i].se; if (Q.size() > k) { pf[i] -= Q.top(); Q.pop(); } } while(!Q.empty()) Q.pop(); FORR(i, n, 1) { Q.push(a[i].fi); sf[i] = sf[i + 1] + a[i].fi; if (Q.size() > m) { sf[i] -= Q.top(); Q.pop(); } } ll ans = 0; FOR(i, k, n - m) maximize(ans, pf[i] + sf[i+1]); cout << ans; } int main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); if (fopen(task".inp", "r")) { freopen(task".inp", "r", stdin); freopen(task".out", "w", stdout); } int tc = 1; // cin >> tc; while(tc--) { init(); process(); } return 0; }

school.cpp: In function 'int main()':
school.cpp:85:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   85 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
school.cpp:86:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   86 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~