제출 #494581

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
494581		aris12345678	Stove (JOI18_stove)	C++14	0 / 100	0 ms	204 KiB

stove

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

const int mxN = 100005;
int a[mxN];

bool check(ll md, int n, int k) {
    int cnt = 0, start = 0;
    for(int i = 0; i < n; i++) {
        if(a[i]-a[start] > md) {
            start = i;
            cnt++;
        }
    }
    if(start != n)
        cnt++;
    return cnt <= k;
}

int main() {
    int n, k;
    scanf("%d %d", &n, &k);
    for(int i = 0; i < n; i++)
        scanf("%d", &a[i]);
    ll st = 0, en = LLONG_MAX, md, diff;
    while(st <= en) {
        md = (st+en)/2;
        if(check(md, n, k))
            diff = md, en = md-1;
        else
            st = md+1;
    }
    // cout << diff << "\n";
    int start = 0;
    ll ans = 0;
    for(int i = 0; i < n; i++) {
        if(a[i]-a[start] > diff) {
            ans += 1LL*(a[i-1]-a[start]+1);
            start = i;
        }
    }
    if(start != n)
        ans += 1LL*(a[n-1]-a[start]+1);
    printf("%lld\n", ans);
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

stove.cpp: In function 'int main()':
stove.cpp:24:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |     scanf("%d %d", &n, &k);
      |     ~~~~~^~~~~~~~~~~~~~~~~
stove.cpp:26:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |         scanf("%d", &a[i]);
      |         ~~~~~^~~~~~~~~~~~~
stove.cpp:39:9: warning: 'diff' may be used uninitialized in this function [-Wmaybe-uninitialized]
   39 |         if(a[i]-a[start] > diff) {
      |         ^~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 50