Submission #240607

#	Time	Username	Problem	Language	Result	Execution time	Memory
240607		mhy908	Feast (NOI19_feast)	C++14	Compilation error	0 ms	0 KiB

feast

#include <bits/stdc++.h>
#define eb emplace_back
#define mp make_pair
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define svec(x) sort(x.begin(), x.end())
#define press(x) x.erase(unique(x.begin(), x.end()), x.end())
#define lb(x, v) lower_bound(x.begin(), x.end(), v)
#define ub(x, v) upper_bound(x.begin(), x.end(), v)
using namespace std;
typedef long long LL;
typedef pair<int, int> pii;
typedef pair<LL, LL> pll;
typedef pair<int, LL> pil;
typedef pair<LL, int> pli;
const LL llinf=10000000000000;
const LL mod1=1000000007;
const LL mod2=998244353;
const int inf=2000000000;

int n, k;
LL arr[300010], dp[300010][2], cnt[300010][2];

int solve(LL x){
    dp[0][0]=-llinf;
    dp[0][1]=0;
    for(int i=1; i<=n; i++){
        if(dp[i-1][0]>dp[i-1][1]-x)dp[i][0]=dp[i-1][0]+arr[i], cnt[i][0]=cnt[i-1][0];
        else dp[i][0]=dp[i-1][1]+arr[i]-x, cnt[i][0]=cnt[i-1][1]+1;
        tie(dp[i][1], cnt[i][1])=max(tie(dp[i-1][0], cnt[i][0]), tie(dp[i-1][1], cnt[i][1]));
    }
    if(tie(dp[n][0], -cnt[n][0])>tie(dp[n][1], -cnt[n][1]))return cnt[n][0];
    return cnt[n][1];
}

int main(){
    scanf("%d %d", &n, &k);
    for(int i=1; i<=n; i++){
        scanf("%lld", &arr[i]);
        arr[i]*=2;
    }
    LL l=0, r=llinf;
    while(l<r){
        LL mid=(l+r)/2;
        if(solve(mid*2+1)>k)l=mid+1;
        else r=mid;
    }
    solve(l*2);
    printf("%lld", max(dp[n][0], dp[n][1])/2+l*k);
}

Compilation message (stderr)

feast.cpp: In function 'int solve(LL)':
feast.cpp:33:22: error: cannot bind non-const lvalue reference of type 'long long int&' to an rvalue of type 'LL {aka long long int}'
     if(tie(dp[n][0], -cnt[n][0])>tie(dp[n][1], -cnt[n][1]))return cnt[n][0];
                      ^~~~~~~~~~
In file included from /usr/include/c++/7/functional:54:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:71,
                 from feast.cpp:1:
/usr/include/c++/7/tuple:1589:5: note:   initializing argument 2 of 'constexpr std::tuple<_Elements& ...> std::tie(_Elements& ...) [with _Elements = {long long int, long long int}]'
     tie(_Elements&... __args) noexcept
     ^~~
feast.cpp:33:48: error: cannot bind non-const lvalue reference of type 'long long int&' to an rvalue of type 'LL {aka long long int}'
     if(tie(dp[n][0], -cnt[n][0])>tie(dp[n][1], -cnt[n][1]))return cnt[n][0];
                                                ^~~~~~~~~~
In file included from /usr/include/c++/7/functional:54:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:71,
                 from feast.cpp:1:
/usr/include/c++/7/tuple:1589:5: note:   initializing argument 2 of 'constexpr std::tuple<_Elements& ...> std::tie(_Elements& ...) [with _Elements = {long long int, long long int}]'
     tie(_Elements&... __args) noexcept
     ^~~
feast.cpp: In function 'int main()':
feast.cpp:38:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &k);
     ~~~~~^~~~~~~~~~~~~~~~~
feast.cpp:40:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld", &arr[i]);
         ~~~~~^~~~~~~~~~~~~~~~~