Key cutting

input/code.cpp: In function 'int main()':
input/code.cpp:9:12: warning: unused variable 'm' [-Wunused-variable]
    9 |     int n, m;
      |            ^

#include <vector>
#include <string>
#include <iostream>
#include <cmath>
 
using namespace std;
 
int main(){
    int n, m;
 
    cin >> n;
 
    vector<int> v = vector<int>(n);
    for (int i = 0; i < n ; ++i){
        cin >> v[i];
    }
 
    int count = 0;
    bool change = true;
    while (change){
        change = false;
        for (int i = 0; i < n; ++i){
            int x = 0;
            int min = v[i];
            for (int j = i; j < n && v[j] != 0; ++j){
                if (v[j] < min)
                    min = v[j];
                ++x;
            }
            if ( x!= 0 || min != 0){
                //for (int t = 0; t < n; ++t)
                    //cout << v[t] << " ";
                for (int j = 0; j < x; ++j){
                    v[i + j] -= min;
                    if (j == 0)
                        count++;
                    change = true;
                }
                if (change)
                    i--;
                //cout << "\t:: " <<i << ": " << x <<" "<< min  << endl;
            }

        }
    }
    cout << count << endl;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED