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- #include <iostream>
- #include <cstdio>
- #include <stdio.h>
- #include <stack>
- #include <list>
- #include <vector>
- #include <cmath>
- #include <algorithm>
- #include <iostream>
- #include <iomanip>
- #include <string.h>
- #include <sstream>
- #include <bitset>
- using namespace std;
- int main(){
- ios::sync_with_stdio(0);
- int n, days = 0;
- vector<int> vec, mys;
- cin >> n;
- for(int i=0; i<n; i++){
- int o;
- cin >> o;
- vec.push_back(o);
- }
- for(int i=0; i<n; i++){
- mys.push_back(vec[i]);
- for(int j=0; j<mys.size(); ++j){
- if(mys[j]==i+1){
- mys[j] = -1;
- }
- }
- for(int j=0; j<mys.size(); ++j){
- if(mys[j]==-1){
- mys.erase(mys.begin()+j);
- j--;
- }
- }
- if(!mys.size()){
- days++;
- }
- }
- cout << days << '\n';
- return 0;
- }
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