Submission #976808

#	Time	Username	Problem	Language	Result	Execution time	Memory
976808		AIF_is_carving	Strange Device (APIO19_strange_device)	C++17	10 / 100	5061 ms	135220 KiB

strange_device

#include<bits/stdc++.h>
 
typedef long long ll;
using namespace std;

vector<vector<ll>> overlappedInterval(vector<vector<ll>>& intervals) {
    if (intervals.empty()) {
        return vector<vector<ll>>();
    }

    // Sort intervals based on start values
    sort(intervals.begin(), intervals.end(), [](const vector<ll>& a, const vector<ll>& b) {
        return a[0] < b[0];
    });

    stack<vector<ll>> mergedStack;
    mergedStack.push(intervals[0]);

    for (int i = 1; i < intervals.size(); i++) {
        vector<ll> current = intervals[i];
        vector<ll>& top = mergedStack.top();

        if (current[0] <= top[1]) {
            // If current interval overlaps with the top of the stack, merge them
            top[1] = max(top[1], current[1]);
        } else {
            // If no overlap, push the current interval onto the stack
            mergedStack.push(current);
        }
    }

    // Convert the stack to a vector
    vector<vector<ll>> mergedIntervals;
    while (!mergedStack.empty()) {
        mergedIntervals.insert(mergedIntervals.begin(), mergedStack.top());
        mergedStack.pop();
    }

    return mergedIntervals;
}


int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    set<pair<ll, ll>> s;
    ll n, A, B; cin>>n>>A>>B;

    ll period;
    ll X = A/(gcd(B+1, A));

    int powX=0, powB=0;
    ll xxx = X;
    while(xxx>0){
        xxx/=2;
        powX+=1;
    }
    xxx=B;
    while(xxx>0){
        xxx/=2;
        powB+=1;
    }

    if(powB+powX>61) period=4e18;
    else period = B*X;

    //cout<<period<<"\n";

    vector<vector<ll>> v;

    for(int i=0; i<n; i++){
        ll x, y; cin>>x>>y;

        if(y-x<period){
            ll XX = x%period;
            ll YY = y%period;

            if(XX<=YY) v.push_back({XX,YY});
            else{
                v.push_back({XX, period-1});
                v.push_back({0, YY});
            }
                
        }
        else{
            v.push_back({0, period-1});
        }
    }

    //for(auto p: v) cout<<p.first<<" "<<p.second<<"\n";

    vector<vector<ll>> merged = overlappedInterval(v);
    ll ans =0;
    for(auto vv: merged){
        ans += vv[1]-vv[0]+1;
    }

    cout<<ans<<"\n";

    return 0;
}
 

Compilation message (stderr)

strange_device.cpp: In function 'std::vector<std::vector<long long int> > overlappedInterval(std::vector<std::vector<long long int> >&)':
strange_device.cpp:19:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for (int i = 1; i < intervals.size(); i++) {
      |                     ~~^~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 0 / 5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20
• Subtask 8: 0 / 30