이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#ifdef ONLINE_JUDGE
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#endif
#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 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, a[500005], b[500005];
pair<int, ll> dp[500005];
int main() {
speed;
precision;
// code
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> a[i];
b[i] = b[i - 1] + a[i];
dp[i] = mp(0, (1LL << 60));
}
dp[0] = mp(0, 0);
for (int i = 1; i <= n; i++) {
// b[z] - b[y] >= b[y] - b[x]
// b[z] >= 2b[y] - b[x]
int l = 0, r = i;
while (l != r) {
int tm = (l + r) / 2;
if (b[i] < dp[tm].S)
r = tm;
else
l = tm + 1;
}
while (dp[l].S > b[i]) l--;
while (dp[l + 1].S <= b[i]) l++;
dp[i] = mp(dp[l].F + 1, b[i] + b[i] - b[l]);
}
cout << dp[n].F;
// endl
#ifndef ONLINE_JUDGE
cerr << "\nTime elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
#endif
return 0;
}
컴파일 시 표준 에러 (stderr) 메시지
segments.cpp: In function 'void ioi(std::string)':
segments.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);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
segments.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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