제출 #1184269

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1184269		KhanhDang	Bigger segments (IZhO19_segments)	C++20	100 / 100	38 ms	19784 KiB

segments

#include<bits/stdc++.h>
using namespace std;
#define     ll long long
#define    pll pair<ll, ll>
#define    pii pair<int, int>
#define     fi first
#define     se second
#define all(v) (v).begin(), (v).end()
#define Unique(v) sort(all(v)); (v).erase(unique(all(v)), (v).end());
const int N = 5e5 + 5;
ll n, a[N], s[N];
pll dp[N];
ll dq[N], l, r;
signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    #define task "task"
    if (fopen(task".INP", "r")) {
        freopen(task".INP", "r", stdin);
        freopen(task".ANS", "w", stdout);
    }
    if (fopen("task.INP", "r")) {
        freopen("task.INP", "r", stdin);
        freopen("task.ANS", "w", stdout);
    }
    cin>>n;
    for (int i = 1; i <= n; i++)
        cin>>a[i], s[i] = s[i - 1] + a[i];
    for (int i = 1; i <= n; i++) {
        while (l < r && dp[dq[l + 1]].se + s[dq[l + 1]] <= s[i])
            l++;
        dp[i] = {dp[dq[l]].fi + 1, s[i] - s[dq[l]]};
        while (r && dp[dq[r]].se + s[dq[r]] >= dp[i].se + s[i])
            r--;
        dq[++r] = i;
    }
    cout<<dp[n].fi;
    cerr<<setprecision(3)<<fixed<<"Time elapsed: "<< 1.0 * clock() / CLOCKS_PER_SEC <<"s\n";
}

컴파일 시 표준 에러 (stderr) 메시지

segments.cpp: In function 'int main()':
segments.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen(task".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
segments.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen(task".ANS", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
segments.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |         freopen("task.INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
segments.cpp:24:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |         freopen("task.ANS", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 14 / 14
• Subtask 3: 10 / 10
• Subtask 4: 36 / 36
• Subtask 5: 27 / 27