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/*
In the name of Allah
made by: Ahmed_Solyman
*/
#include <bits/stdc++.h>
#include <ext/rope>
using namespace std;
using namespace __gnu_cxx;
#pragma GCC optimize("-Ofast")
#pragma GCC optimize("-O1")
//-------------------------------------------------------------//
typedef long long ll;
typedef unsigned long long ull;
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define PI acos(-1)
#define lb lower_bound
#define ub upper_bound
#define endl '\n'
#define all(v) v.begin(),v.end()
#define allr(v) v.rbegin(),v.rend()
#define sum_to(n) (n*(n+1))/2
#define pb push_back
#define pf push_front
#define fil(arr,x) memset(arr,x,sizeof(arr))
const ll mod=1e9+7;
int dx[8]={0,1,0,-1,1,1,-1,-1};
int dy[8]={1,0,-1,0,1,-1,-1,1};
//-------------------------------------------------------------//
ll lcm(ll a,ll b)
{
return (max(a,b)/__gcd(a,b))*min(a,b);
}
void person_bool(bool x)
{
cout<<(x?"YES":"NO")<<endl;
}
struct BIT{
vector<int>bit;
int n;
void init(int _n){
bit.assign(_n+5,0LL);
n=_n;
}
void add(int i,int v){
while(i<=n)bit[i]+=v,i+=i&(-i);
}
int sum(int i){
int ret=0;
while(i)ret+=bit[i],i-=i&(-i);
return ret;
}
int query(int l,int r){
return sum(r)-sum(l-1);
}
}b;
bool vis[200005];
int main()
{
//freopen("input.txt","r",stdin);
//freopen("output.txt","w",stdout);
#ifndef ONLINE_JUDGE
//freopen("input.in", "r", stdin);
//freopen("output.out", "w", stdout);
#endif
fast
int n;cin>>n;
string s;cin>>s;
vector<int>v[26];
for(int i=0;i<n*2;i++){
v[s[i]-'a'].push_back(i+1);
}
for(int i=0;i<26;i++){
int cnt=0;
for(int j=0;j<(int)v[i].size()/2;j++){
assert(v[i][j]<=n);
}
}
b.init(n);
return 0;
}
컴파일 시 표준 에러 (stderr) 메시지
Main.cpp: In function 'int main()':
Main.cpp:74:13: warning: unused variable 'cnt' [-Wunused-variable]
74 | int cnt=0;
| ^~~
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