Submission #1222421

#TimeUsernameProblemLanguageResultExecution timeMemory
1222421goulthenSails (IOI07_sails)C++20
55 / 100
62 ms7240 KiB
//#pragma GCC optimize("O3") //#pragma GCC optimize("unroll-loops") #include <bits/stdc++.h> using namespace std; #include <ext/pb_ds/assoc_container.hpp> using namespace __gnu_pbds; template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>; #define int long long #define ll long long #define pii pair<int, int> #define pll pair<ll, ll> #define fi first #define se second #define rep(i, a, b) for (int i = a; i <= b; ++i) #define per(i, b, a) for (int i = b; i >= a; --i) #define pb push_back #define eb emplace_back #define all(v) (v).begin(), (v).end() #define lsb(x) (x)&(-x) void setIO(string name = "") { ios_base::sync_with_stdio(false); cin.tie(nullptr);cout.tie(nullptr); if (!name.empty()) { freopen((name + ".in").c_str(), "r", stdin); freopen((name + ".out").c_str(), "w", stdout); } } ll fexp(ll a, ll b, ll m) { if (b == 0) return 1LL; ll p = a; ll ans = 1; while (b > 0) { if (b % 2 != 0) ans = (ans*p)%m; p = (p*p)%m; b >>= 1; } return ans; } const int MAXN = 1e5 + 10; const int INF = 1e18+5; const int MOD = 1e9+7; int a[MAXN],n; struct Node { int v; }; struct Seg3 { Node seg3[4*MAXN]; int lazy[4*MAXN]; void flush(int i, int l, int r) { seg3[i].v += lazy[i]; if (l != r) { lazy[2*i] += lazy[i]; lazy[2*i+1] += lazy[i]; } lazy[i] = 0; } Node join(Node a, Node b) { Node r; r.v = a.v + b.v; return r; } void build(int i, int l, int r) { if (l == r) { Node tmp; tmp.v = a[l]; seg3[i] = tmp; return; } int mid =(l+r)>>1; build(2*i,l,mid); build(2*i+1,mid+1,r); seg3[i] = join(seg3[2*i],seg3[2*i+1]); } Seg3(int l, int r) { build(1,l,r); } void update(int i, int l, int r, int tl, int tr, int x) { flush(i,l,r); if (tr < l || tl > r) return; if (l>=tl && r <= tr) { lazy[i] += x; return; } int mid =(l+r)>>1; update(2*i,l,mid,tl,tr,x); update(2*i+1,mid+1,r,tl,tr,x); seg3[i] = join(seg3[2*i],seg3[2*i+1]); } int query(int i, int l, int r, int tl, int tr) { flush(i,l,r); if (l==r) return seg3[i].v; int mid =(l+r)>>1; if (mid >= tl) return query(2*i,l,mid,tl,tr); else return query(2*i+1,mid+1,r,tl,tr); } int upperbound(int x) { int lo = 1, hi = n, ans=0; while (lo <= hi) { int mid = (lo+hi)/2; if (query(1,1,n,mid,mid) <= x) { ans = mid; lo = mid + 1; } else { hi = mid - 1; } } return ans; } }; void solve() { int m,cnt = 0;cin >> m; rep(i,1,m) { int h,x;cin >> h >> x; a[1]++; a[h+1]--; cnt+=x; n = max(h,n); } rep(i,1,n) a[i] +=a[i-1]; reverse(a+1,a+n+1); int ans = 0, i = 0; Seg3 seg(1,n); while (cnt > 0) { int k = seg.upperbound(0)+1; if (n-k+1 > cnt) { ans += cnt*i; break; } ans += (n-k+1)*i; cnt-=n-k+1; seg.update(1,1,n,k,n,-1); i++; } cout << ans << '\n'; } int32_t main() { setIO(); int tt = 1; //cin >> tt; while (tt-- > 0) solve(); }

Compilation message (stderr)

sails.cpp: In function 'void setIO(std::string)':
sails.cpp:28:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |         freopen((name + ".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sails.cpp:29:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |         freopen((name + ".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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