#include <bits/stdc++.h>
using namespace std;
const int MXN = 1e5+5;
#define ll long long
ll A[MXN], P[MXN], n, all;
vector<ll> sa, sb;
ll sum(int i,int j){return (i<=j?P[j]-P[i-1]:0);}
int cut(ll x,int i){
ll ans = 0;
for(int i = 1;i<=n;i++){
for(int j = i;j<=n;j++){ // [i,j] [j+1,k] [k+1,n]+[1,i-1]
for(int k = j+1;k<=n;k++){
ans = max(ans,min({sum(i,j),sum(j+1,k),sum(k+1,n)+sum(1,i-1)}));
}
}
}
return ans;
}
int f(ll x){ // 답이 x 이상인가?
if(cut(x,i)>=x) return 1;
return 0;
}
int main() {
cin.tie(0)->sync_with_stdio(0);
cin >> n;
ll nans = 0;
for(int i = 1;i<=n;i++){
cin >> A[i]; P[i] = P[i-1]+A[i];
}
all = P[n];
ll suma = 0, sumb = 0;
sa.push_back(0);
for(int t = 0;t<2;t++)
for(int i = 1;i<=n;i++){
suma += A[i]; sa.push_back(suma);
}
for(int i = n;i>0;i--){
sumb += A[i]; sb.push_back(sumb);
}
for(int i = 0;i<=n;i++) sb.push_back(-P[i]);
sort(sb.begin(),sb.end());
ll l = 0, r = all;
for(;l<r;){
ll mid = (l+r)/2;
if(f(mid)) l = mid;
else r = mid-1;
}
while(f(l+1)) l++;
cout << l;
}
Compilation message
2014_ho_t3.cpp: In function 'int f(long long int)':
2014_ho_t3.cpp:20:14: error: 'i' was not declared in this scope
20 | if(cut(x,i)>=x) return 1;
| ^
2014_ho_t3.cpp: In function 'int main()':
2014_ho_t3.cpp:26:8: warning: unused variable 'nans' [-Wunused-variable]
26 | ll nans = 0;
| ^~~~
