Submission #961338

#TimeUsernameProblemLanguageResultExecution timeMemory
961338vjudge1Deda (COCI17_deda)C++17
140 / 140
96 ms11616 KiB
/** *         ┏┓    ┏┓ *         ┏┛┗━━━━━━━┛┗━━━┓ *         ┃       ┃   *         ┃   ━    ┃ *         ┃ >   < ┃ *         ┃       ┃ *         ┃... ⌒ ...  ┃ *         ┃ ┃ *         ┗━┓ ┏━┛ *          ┃ ┃ Code is far away from bug with the animal protecting           *          ┃ ┃ 神兽保佑,代码无bug *          ┃ ┃            *          ┃ ┃        *          ┃ ┃ *          ┃ ┃            *          ┃ ┗━━━┓ *          ┃ ┣┓ *          ┃ ┏┛ *          ┗┓┓┏━━━━━━━━┳┓┏┛ *           ┃┫┫ ┃┫┫ *           ┗┻┛ ┗┻┛ */ #include <bits/stdc++.h> using namespace std; #define FASTIO ios::sync_with_stdio(0), cin.tie(0), cout.tie(0) #define int long long #define cl(x) (x << 1) #define cr(x) (x << 1) + 1 const int INF = 1e17; int ans = 1e18; struct node { int val; }; struct SEG { int n; vector<node> seg; vector<node> arr; void init(int a) { n = a; seg.resize(4 * n + 5); arr.resize(a + 1); } void pull(int id) { auto a = seg[cl(id)]; auto b = seg[cr(id)]; seg[id] = {min(a.val, b.val)}; } void build(int id, int l, int r) { if (l == r) { seg[id] = arr[l]; return; } int mid = (l + r) >> 1; build(cl(id), l, mid); build(cr(id), mid + 1, r); pull(id); } void update(int id, int l, int r, int x, int v) { if (l == r) { seg[id] = {v}; return; } int mid = (l + r) >> 1; if (x <= mid) { update(cl(id), l, mid, x, v); } if (mid < x) { update(cr(id), mid + 1, r, x, v); } pull(id); } node query(int id, int l, int r, int sl, int sr) { if (sl <= l && r <= sr) { // 目前這個區間在查詢區間內 return seg[id]; } int mid = (l + r) >> 1; node ans1, ans2; bool f1 = 0, f2 = 0; if (sl <= mid) { // 左區間跟查詢區間有交集 ans1 = query(cl(id), l, mid, sl, sr); f1 = 1; } if (mid < sr) { // 右區間跟查詢區間有交集 ans2 = query(cr(id), mid + 1, r, sl, sr); f2 = 1; } if (f1 && f2) { return {min(ans1.val, ans2.val)}; } if (f1) return ans1; if (f2) return ans2; } int fquery(int l, int r, int v) { int p = query(1, 1, n, l, r).val; if (p > v) return -1; while (l != r) { int mid = (l + r) >> 1; int x = query(1, 1, n, l, mid).val; if (x <= v) r = mid; else l = mid + 1; } return l; } int xxxquery(int id, int l, int r, int sl, int sr, int tag) { if (sl <= l && r <= sr) { // 目前這個區間在查詢區間內 if (seg[id].val > tag) return seg[id].val; if (l == r) { ans = min(ans, l); return seg[id].val; } } int mid = (l + r) >> 1; int ans1, ans2; bool f1 = 0, f2 = 0; if (sl <= mid) { // 左區間跟查詢區間有交集 ans1 = xxxquery(cl(id), l, mid, sl, sr, tag); f1 = 1; if (ans1 < tag) return ans1; } if (mid < sr) { // 右區間跟查詢區間有交集 ans2 = xxxquery(cr(id), mid + 1, r, sl, sr, tag); f2 = 1; } if (f1 && f2) { return min(ans1, ans2); } if (f1) return ans1; if (f2) return ans2; } } tree; signed main() { FASTIO; int n, q; cin >> n >> q; tree.init(n); for (int i = 1; i <= n; i++) tree.arr[i] = {INF}; tree.build(1, 1, n); for (int i = 0; i < q; i++) { char sta; int x, a, y, b; cin >> sta; if (sta == 'M') { cin >> x >> a; tree.update(1, 1, n, a, x); } if (sta == 'D') { cin >> y >> b; ans = 1e18; tree.xxxquery(1, 1, n, b, n, y); if (ans == 1e18) ans = -1; cout << ans << '\n'; } } }

Compilation message (stderr)

deda.cpp: In member function 'long long int SEG::xxxquery(long long int, long long int, long long int, long long int, long long int, long long int)':
deda.cpp:135:5: warning: control reaches end of non-void function [-Wreturn-type]
  135 |     }
      |     ^
deda.cpp: In function 'int main()':
deda.cpp:119:13: warning: 'ans1' may be used uninitialized in this function [-Wmaybe-uninitialized]
  119 |         int ans1, ans2;
      |             ^~~~
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