from itertools import accumulate
n,s = int(input()),[*accumulate(map(lambda x: 2*int(x)-1,input()))]
l = {0:-1}; c = 0
for x,y in enumerate(s):
l[y]=e=l.get(y,x)
c = max(c,x-e)
print(c)//بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ
#include <bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
template<typename T> using ordered_set = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define Samo7a ios_base::sync_with_stdio(false);cin.tie(nullptr); cout.tie(nullptr);
#define re return
#define FX(n) fixed << setprecision(n)
#define endl '\n'
#define all(v) v.begin(),v.end()
#define allr(v) v.rbegin(),v.rend()
#define pb push_back
#define eb emplace_back
#define pi acos(-1)
#define F first
#define S second
const int N = 2e3 + 10, MOD = 1e9 + 7;
const int dx[]{1, -1, 0, 0, 1, -1, 1, -1};
const int dy[]{0, 0, 1, -1, 1, -1, -1, 1};
inline void debugMode() {
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
//freopen("output.txt", "w", stdout);
#endif // ONLINE_JUDGE
}
//الشَّيْطَانُ يَعِدُكُمُ الْفَقْرَ وَيَأْمُرُكُم بِالْفَحْشَاءِ ۖ وَاللَّهُ يَعِدُكُم مَّغْفِرَةً مِّنْهُ وَفَضْلًا ۗ وَاللَّهُ وَاسِعٌ عَلِيمٌ (268)
//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//
/*
id:
idea:
*/
void TestCase() {
int n;
string s;
cin >> n >> s;
map < int , int > mp;
mp[0] = 0;
int delta = 0;
int mx = 0;
for ( int i = 0 ; i < n ; i++)
{
(s[i] == '1')?delta++: delta--;
if (not mp.count(delta))
mp[delta] = i + 1;
else
mx = max(mx , (i + 1) - mp[delta]);
}
cout << mx << endl;
}
int main() {
Samo7a
debugMode();
int t = 1;
//cin >> t;
while (t--) {
TestCase();
}
re 0;
}198. House Robber | 153. Find Minimum in Rotated Sorted Array |
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137. Single Number II | 130. Surrounded Regions |
129. Sum Root to Leaf Numbers | 120. Triangle |
102. Binary Tree Level Order Traversal | 96. Unique Binary Search Trees |
75. Sort Colors | 74. Search a 2D Matrix |
71. Simplify Path | 62. Unique Paths |
50. Pow(x, n) | 43. Multiply Strings |
34. Find First and Last Position of Element in Sorted Array | 33. Search in Rotated Sorted Array |
17. Letter Combinations of a Phone Number | 5. Longest Palindromic Substring |
3. Longest Substring Without Repeating Characters | 1312. Minimum Insertion Steps to Make a String Palindrome |
1092. Shortest Common Supersequence | 1044. Longest Duplicate Substring |
1032. Stream of Characters | 987. Vertical Order Traversal of a Binary Tree |
952. Largest Component Size by Common Factor | 212. Word Search II |
174. Dungeon Game | 127. Word Ladder |