Submission #392234

#TimeUsernameProblemLanguageResultExecution timeMemory
392234acmDivide and conquer (IZhO14_divide)C++14
100 / 100
94 ms13016 KiB
#include <bits/stdc++.h> #define speed \ ios_base::sync_with_stdio(0); \ cin.tie(0); \ cout.tie(0); #define precision \ cout.precision(30); \ cerr.precision(10); #define ll long long #define ld long double #define pll pair<ll, ll> #define pii pair<int, int> #define forn(n) for (int i = 1; i <= n; i++) #define forlr(l, r) for (int i = l; i != r; (l > r ? i-- : i++)) #define pb(x) push_back(x) #define sz(x) (int)x.size() #define mp(x, y) make_pair(x, y) #define all(x) x.begin(), x.end() #define pc(x) __builtin_popcount(x) #define pcll(x) __builtin_popcountll(x) #define F first #define S second using namespace std; mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count()); void ioi(string name) { freopen((name + ".in").c_str(), "r", stdin); freopen((name + ".out").c_str(), "w", stdout); } ll n, k, m = -(1LL << 60), g[100005], e[100005], t[800005]; pair<ll, pair<ll, ll>> a[100005]; vector<ll> b; void upd(ll v, ll l, ll r, ll x, ll y) { if (l == r) { t[v] = y; return; } ll tm = (l + r) / 2; if (x <= tm) upd(v + v, l, tm, x, y); else upd(v + v + 1, tm + 1, r, x, y); t[v] = max(t[v + v], t[v + v + 1]); } ll get(ll v, ll l, ll r, ll x, ll y) { if (r < x || y < l) return 0; if (x <= l && r <= y) return t[v]; ll tm = (l + r) / 2; return max(get(v + v, l, tm, x, y), get(v + v + 1, tm + 1, r, x, y)); } int main() { speed; precision; // code cin >> n; for (int i = 1; i <= n; i++) { ll x, y, z; cin >> x >> y >> z; a[i] = mp(x, mp(y, z)); g[i] = g[i - 1] + y; e[i] = e[i - 1] + z; b.pb(a[i].F - e[i - 1]); b.pb(a[i].F - e[i]); } sort(all(b)); b.erase(unique(all(b)), b.end()); k = sz(b); for (int i = 1; i <= n; i++) { upd(1, 1, k, lower_bound(all(b), a[i].F - e[i]) - b.begin() + 1, g[i]); } for (int i = 1; i <= n; i++) { m = max(m, get(1, 1, k, 1, lower_bound(all(b), a[i].F - e[i - 1]) - b.begin() + 1) - g[i - 1]); } cout << m; // endl #ifndef ONLINE_JUDGE cerr << "\nTime elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n"; #endif return 0; }

Compilation message (stderr)

divide.cpp: In function 'void ioi(std::string)':
divide.cpp:26:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   26 |   freopen((name + ".in").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
divide.cpp:27:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   27 |   freopen((name + ".out").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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