Here is my not accepted solution:
#include<iostream>
#include<string>
using namespace std;

double P(int power[],string names[],int a,int n,int video_power,int on_or_off[],int w,int h){
a=video_power;
for(int i=0;i<n;i++){if(on_or_off[i]==1){a/=power[i];}}
double res=a/(w*h);
return res;
}

int main()
{

int n;
cin>>n;
string * names = new string[n];
int * power = new int[n];
for (int i=0;i<n;i++){
cin>>names[i];
cin>>power[i];
}

int w,h,video_power;
cin>>w>>h>>video_power;

double results[100];
int on_or_off[100];
for(int i=0;i<n;i++){on_or_off[i]=1;}
int e=0;

int a=video_power;
for (int i=0; i<n;i++){
a/=power[i];
}
double prodyctivity=a/(w*h);
results[e]=prodyctivity;e++;

int m;
cin>>m;
for(int i=0; i<m; i++){
string change,change_name;
cin>>change;
if(change[0]!='R'){
cin>>change_name;
for(int y=0;y<n;y++){
    if(change=="On" && change_name==names[y]){
        on_or_off[y]=1;
        prodyctivity=P(power,names,a,n,video_power,on_or_off,w,h);
        results[e]=prodyctivity;e++;
        }
    else if(change=="Off" && change_name==names[y]){
        on_or_off[y]=0;
        prodyctivity=P(power,names,a,n,video_power,on_or_off,w,h);
        results[e]=prodyctivity;e++;
        }
}
}
else{
int a1,a2;
cin>>a1>>a2;
w=a1;h=a2;
prodyctivity=P(power,names,a,n,video_power,on_or_off,w,h);
results[e]=prodyctivity;e++;
}
}

for(int i=0;i<m+1;i++){
    if(results[i]<10){cout<<"Slideshow"<<endl;}
    else if(results[i]>=60){cout<<"Perfect"<<endl;}
    else{cout<<"So-so"<<endl;}
}
}

Please!

I dont know where your mistake is, but anyway this solution is wrong.
Check the max test case: n = 99999 and each option is 100 (100^99999). Your double precision not enough for AC.

It's 100000 results, not 100 results, hence the access violation on your tiny array