# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
1275395 | vibeduck | Jobs (BOI24_jobs) | C++20 | 50 ms | 5244 KiB |
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define pf push_front
#define mp make_pair
#define fi first
#define se second
#define int long long
#define all(x) (x).begin(), (x).end()
typedef long double ld;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<bool>> vvb;
typedef vector<vector<ll>> vvll;
typedef vector<string> vs;
typedef vector<vector<string>> vvs;
typedef vector<char> vc;
typedef vector<vector<char>> vvc;
typedef map<int, int> mii;
typedef unordered_map<int, int> umii;
const int mod = 1e9 + 7;
const int inf = INTMAX_MAX;
const bool tc = false;
int n, s;
int ans = 0;
struct chain {
vi v; int ptr;
};
inline void solve() {
cin >> n >> s;
vector<chain> vc;
for (int i = 0; i < n; i++) {
int x, p;
cin >> x >> p;
if (p == 0) {
chain c;
c.v = {x};
c.ptr = 0;
vc.pb(c);
continue;
}
vc.back().v.pb(x);
}
// minimum loss at a point for positive profit
set<pair<int, pii>> st; // {maxloss, {profit, index}}
for (int i = 0; i < vc.size(); i++) {
chain x = vc[i];
pii tmp = {0, 0}; // {profit, maxloss}
bool ok = false;
for (int j = x.ptr; j < x.v.size(); j++) {
tmp.fi += x.v[j];
tmp.se = min(tmp.se, tmp.fi);
x.ptr++;
if (tmp.fi >= 0) { ok = true; break; } // check this
}
if (ok) st.insert({-tmp.se, {tmp.fi, i}});
}
while (st.size()) {
auto cur = *st.begin();
int ml = cur.fi; int p = cur.se.fi; int i = cur.se.se;
//cout << ml << " " << p << " " << i << '\n';
if (ml > s) {
//cout << "done\n";
break;
}
ans += p;
// recalculate for that chain
// vc[i]
st.erase(cur);
chain x = vc[i];
pii tmp = {0, 0};
bool ok = false;
for (int j = x.ptr; j < x.v.size(); j++) {
tmp.fi += x.v[j];
tmp.se = min(tmp.se, tmp.fi);
vc[i].ptr++;
if (tmp.fi >= 0) { ok = true; break; } // check this
}
//if (ok) cout << "re-inserted w/ " << -tmp.se << " " << tmp.fi << " " << i << '\n';
// else cout << "not possible to gain profit anywhere\n";
if (ok) st.insert({-tmp.se, {tmp.fi, i}});
}
cout << ans << '\n';
}
void setIO(string s) {
freopen((s + ".in").c_str(), "r", stdin);
freopen((s + ".out").c_str(), "w", stdout);
}
signed main() {
ios::sync_with_stdio(false);
cout.tie(0);
cin.tie(0);
//setIO();
int t = 1;
if (tc) {
cin >> t;
}
while (t--) {
solve();
}
}
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