Submission #1007992

#TimeUsernameProblemLanguageResultExecution timeMemory
1007992The_SamuraiHorses (IOI15_horses)C++17
17 / 100
1574 ms8284 KiB
#include "horses.h" #include "bits/stdc++.h" using namespace std; const int mod = 1e9 + 7; using ll = long long; struct SegTreeY { vector<int> tree; int size; int neutral_element = -1e9; int merge(int a, int b) { return max(a, b); } void build(const vector<int> &a) { size = 1; while (size < a.size()) size *= 2; tree.assign(2 * size, neutral_element); for (int i = size; i < size + a.size(); i++) tree[i] = a[i - size]; for (int i = size - 1; i > 0; i--) tree[i] = merge(tree[i << 1], tree[i << 1 | 1]); } void upd(int i, int v) { i += size; tree[i] = v; for (; i > 1; i >>= 1) tree[i >> 1] = merge(tree[i], tree[i ^ 1]); } int get(int l, int r) { if (l > r) return neutral_element; int res = neutral_element; for (l += size, r += size + 1; l < r; l >>= 1, r >>= 1) { if (l & 1) res = merge(res, tree[l++]); if (r & 1) res = merge(res, tree[--r]); } return res; } }; struct SegTreeX { vector<int> tree; int size; int neutral_element = 1; int merge(int a, int b) { return 1ll * a * b % mod; } void build(const vector<int> &a) { size = 1; while (size < a.size()) size *= 2; tree.assign(2 * size, neutral_element); for (int i = size; i < size + a.size(); i++) tree[i] = a[i - size]; for (int i = size - 1; i > 0; i--) tree[i] = merge(tree[i << 1], tree[i << 1 | 1]); } void upd(int i, int v) { i += size; tree[i] = v; for (; i > 1; i >>= 1) tree[i >> 1] = merge(tree[i], tree[i ^ 1]); } int get(int l, int r) { if (l > r) return neutral_element; int res = neutral_element; for (l += size, r += size + 1; l < r; l >>= 1, r >>= 1) { if (l & 1) res = merge(res, tree[l++]); if (r & 1) res = merge(res, tree[--r]); } return res; } }; int n; vector<int> x, y; int get_ans() { ll best = 1; int mul = 1; for (int i = 0; i < n; i++) { mul *= x[i]; best = max(best, ll(mul) * y[i]); } return best % mod; } int init(int N, int X[], int Y[]) { n = N; x.resize(n), y.resize(n); for (int i = 0; i < n; i++) x[i] = X[i], y[i] = Y[i]; return get_ans(); } int updateX(int pos, int val) { x[pos] = val; return get_ans(); } int updateY(int pos, int val) { y[pos] = val; return get_ans(); }

Compilation message (stderr)

horses.cpp: In member function 'void SegTreeY::build(const std::vector<int>&)':
horses.cpp:18:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |   while (size < a.size()) size *= 2;
      |          ~~~~~^~~~~~~~~~
horses.cpp:20:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |   for (int i = size; i < size + a.size(); i++) tree[i] = a[i - size];
      |                      ~~^~~~~~~~~~~~~~~~~
horses.cpp: In member function 'int SegTreeX::merge(int, int)':
horses.cpp:47:22: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   47 |   return 1ll * a * b % mod;
      |          ~~~~~~~~~~~~^~~~~
horses.cpp: In member function 'void SegTreeX::build(const std::vector<int>&)':
horses.cpp:52:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |   while (size < a.size()) size *= 2;
      |          ~~~~~^~~~~~~~~~
horses.cpp:54:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |   for (int i = size; i < size + a.size(); i++) tree[i] = a[i - size];
      |                      ~~^~~~~~~~~~~~~~~~~
horses.cpp: In function 'int get_ans()':
horses.cpp:85:14: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   85 |  return best % mod;
      |         ~~~~~^~~~~
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