#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef long double ld;
#define pb push_back
#define pf push_front
#define fi first
#define se second
const ll mod = 1e9+7, mxn = 5e5+7;
ll n, dp[mxn], opt[mxn], a[mxn];
struct dynamic_segment_tree
{
struct node {ll v, l, r; node() {v = 0; l = -1, r = -1;}};
vector<node> st;
dynamic_segment_tree() {st.clear(); st.pb(node());};
void update(ll id, ll l, ll r, ll i, ll x)
{
if (l == r) {st[id].v = max(st[id].v,x); return;}
ll m = (r+l)>>1; st[id].v = max(st[id].v,x);
if (l <= i && i <= m)
{
if (st[id].l == -1) {st[id].l = st.size(); st.pb(node());}
update(st[id].l,l,m,i,x);
}
if (m < i && i <= r)
{
if (st[id].r == -1) {st[id].r = st.size(); st.pb(node());}
update(st[id].r,m+1,r,i,x);
}
}
ll get(ll id, ll l, ll r, ll u, ll v)
{
if (r < u || v < l) return 0;
if (u <= l && r <= v) return st[id].v;
ll m = (r+l)>>1, val = 0;
if (st[id].l != -1) val = max(val,get(st[id].l,l,m,u,v));
if (st[id].r != -1) val = max(val,get(st[id].r,m+1,r,u,v));
return val;
}
void update(ll i, ll x) {update(0,0,1e17,i,x);}
ll get(ll u, ll v) {return get(0,0,1e17,u,v);}
} st;
signed main()
{
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
freopen("test.inp","r",stdin); freopen("test.out","w",stdout); freopen("test.err","w",stderr);
cin >> n;
for (ll i = 1; i <= n; i++)
{
cin >> a[i];
a[i] += a[i#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef long double ld;
#define pb push_back
#define pf push_front
#define fi first
#define se second
const ll mod = 1e9+7, mxn = 5e5+7;
ll n, dp[mxn], opt[mxn], a[mxn];
struct dynamic_segment_tree
{
struct node {ll v, l, r; node() {v = 0; l = -1, r = -1;}};
vector<node> st;
dynamic_segment_tree() {st.clear(); st.pb(node());};
void update(ll id, ll l, ll r, ll i, ll x)
{
if (l == r) {st[id].v = max(st[id].v,x); return;}
ll m = (r+l)>>1; st[id].v = max(st[id].v,x);
if (l <= i && i <= m)
{
if (st[id].l == -1) {st[id].l = st.size(); st.pb(node());}
update(st[id].l,l,m,i,x);
}
if (m < i && i <= r)
{
if (st[id].r == -1) {st[id].r = st.size(); st.pb(node());}
update(st[id].r,m+1,r,i,x);
}
}
ll get(ll id, ll l, ll r, ll u, ll v)
{
if (r < u || v < l) return 0;
if (u <= l && r <= v) return st[id].v;
ll m = (r+l)>>1, val = 0;
if (st[id].l != -1) val = max(val,get(st[id].l,l,m,u,v));
if (st[id].r != -1) val = max(val,get(st[id].r,m+1,r,u,v));
return val;
}
void update(ll i, ll x) {update(0,0,1e17,i,x);}
ll get(ll u, ll v) {return get(0,0,1e17,u,v);}
} st;
signed main()
{
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
// freopen("test.inp","r",stdin); freopen("test.out","w",stdout); freopen("test.err","w",stderr);
cin >> n;
for (ll i = 1; i <= n; i++)
{
cin >> a[i];
a[i] += a[i-1];
}
for (ll i = 1; i <= n; i++)
{
ll opt_pos = st.get(0,a[i]);
dp[i] = dp[opt_pos]+1;
opt[i] = a[i]-a[opt_pos];
st.update(opt[i]+a[i],i);
}
cout << dp[n];
}-1];
}
for (ll i = 1; i <= n; i++)
{
ll opt_pos = st.get(0,a[i]);
dp[i] = dp[opt_pos]+1;
opt[i] = a[i]-a[opt_pos];
st.update(opt[i]+a[i],i);
}
cout << dp[n];
}
Compilation message
segments.cpp:51:20: error: stray '#' in program
51 | a[i] += a[i#include <bits/stdc++.h>
| ^
segments.cpp: In function 'int main()':
segments.cpp:51:20: error: expected ']' before 'include'
51 | a[i] += a[i#include <bits/stdc++.h>
| ^~~~~~~~
| ]
segments.cpp:51:20: error: expected ';' before 'include'
51 | a[i] += a[i#include <bits/stdc++.h>
| ^~~~~~~~
| ;
segments.cpp:94:1: error: a function-definition is not allowed here before '{' token
94 | {
| ^
segments.cpp:111:4: error: expected ';' before ']' token
111 | }-1];
| ^
| ;
segments.cpp:111:2: warning: statement has no effect [-Wunused-value]
111 | }-1];
| ^~
segments.cpp:59:10: warning: unused variable 'mod' [-Wunused-variable]
59 | const ll mod = 1e9+7, mxn = 5e5+7;
| ^~~
segments.cpp:60:4: warning: unused variable 'n' [-Wunused-variable]
60 | ll n, dp[mxn], opt[mxn], a[mxn];
| ^
segments.cpp:60:7: warning: unused variable 'dp' [-Wunused-variable]
60 | ll n, dp[mxn], opt[mxn], a[mxn];
| ^~
segments.cpp:60:16: warning: unused variable 'opt' [-Wunused-variable]
60 | ll n, dp[mxn], opt[mxn], a[mxn];
| ^~~
segments.cpp:60:26: warning: unused variable 'a' [-Wunused-variable]
60 | ll n, dp[mxn], opt[mxn], a[mxn];
| ^
segments.cpp:46:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
46 | freopen("test.inp","r",stdin); freopen("test.out","w",stdout); freopen("test.err","w",stderr);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
segments.cpp:46:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
46 | freopen("test.inp","r",stdin); freopen("test.out","w",stdout); freopen("test.err","w",stderr);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
segments.cpp:46:75: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
46 | freopen("test.inp","r",stdin); freopen("test.out","w",stdout); freopen("test.err","w",stderr);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
