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void solve() {
    ll k, n, m;
    cin>> n >> m;
    vector<pair<ll,ll>> vp;
    for(ll i = 0; i < n; i++) {
        ll x,y;
        cin >> x >> y;
        if(y - x > 1) {
            vp.push_back({x+1,1});
            vp.push_back({y, -1});
        }
    }
    sort(vp.begin(), vp.end());
    ll curr = 0;
    ll prev = -1;
    ll ans = n;
    priority_queue<pair<ll,ll>> pq;
    for(auto it: vp) {
       if(prev == -1) {
           prev = it.f;
           curr+=it.s;
       }
       else {
           pq.push({curr, it.f - prev});
           prev = it.f;
           curr += it.s;
       }
    }
    while(!pq.empty() && m > 0) {
        auto it = pq.top(); pq.pop();
        ll inter = min(m, it.s);
        ans += inter * it.f;
        m -=inter;
    }
    cout << ans <<endl;
}

prog.cpp: In function ‘void solve()’:
prog.cpp:2:5: error: ‘ll’ was not declared in this scope
     ll k, n, m;
     ^~
prog.cpp:3:5: error: ‘cin’ was not declared in this scope
     cin>> n >> m;
     ^~~
prog.cpp:3:11: error: ‘n’ was not declared in this scope
     cin>> n >> m;
           ^
prog.cpp:3:16: error: ‘m’ was not declared in this scope
     cin>> n >> m;
                ^
prog.cpp:4:5: error: ‘vector’ was not declared in this scope
     vector<pair<ll,ll>> vp;
     ^~~~~~
prog.cpp:4:12: error: ‘pair’ was not declared in this scope
     vector<pair<ll,ll>> vp;
            ^~~~
prog.cpp:4:25: error: ‘vp’ was not declared in this scope
     vector<pair<ll,ll>> vp;
                         ^~
prog.cpp:5:11: error: expected ‘;’ before ‘i’
     for(ll i = 0; i < n; i++) {
           ^~
           ;
prog.cpp:5:19: error: ‘i’ was not declared in this scope
     for(ll i = 0; i < n; i++) {
                   ^
prog.cpp:6:11: error: expected ‘;’ before ‘x’
         ll x,y;
           ^~
           ;
prog.cpp:7:16: error: ‘x’ was not declared in this scope
         cin >> x >> y;
                ^
prog.cpp:7:21: error: ‘y’ was not declared in this scope
         cin >> x >> y;
                     ^
prog.cpp:13:5: error: ‘sort’ was not declared in this scope
     sort(vp.begin(), vp.end());
     ^~~~
prog.cpp:13:5: note: suggested alternative: ‘short’
     sort(vp.begin(), vp.end());
     ^~~~
     short
prog.cpp:14:7: error: expected ‘;’ before ‘curr’
     ll curr = 0;
       ^~~~~
       ;
prog.cpp:15:7: error: expected ‘;’ before ‘prev’
     ll prev = -1;
       ^~~~~
       ;
prog.cpp:16:7: error: expected ‘;’ before ‘ans’
     ll ans = n;
       ^~~~
       ;
prog.cpp:17:5: error: ‘priority_queue’ was not declared in this scope
     priority_queue<pair<ll,ll>> pq;
     ^~~~~~~~~~~~~~
prog.cpp:17:33: error: ‘pq’ was not declared in this scope
     priority_queue<pair<ll,ll>> pq;
                                 ^~
prog.cpp:18:18: error: unable to deduce ‘auto&&’ from ‘vp’
     for(auto it: vp) {
                  ^~
prog.cpp:19:11: error: ‘prev’ was not declared in this scope
        if(prev == -1) {
           ^~~~
prog.cpp:21:12: error: ‘curr’ was not declared in this scope
            curr+=it.s;
            ^~~~
prog.cpp:21:12: note: suggested alternative: ‘char’
            curr+=it.s;
            ^~~~
            char
prog.cpp:24:21: error: ‘curr’ was not declared in this scope
            pq.push({curr, it.f - prev});
                     ^~~~
prog.cpp:24:21: note: suggested alternative: ‘char’
            pq.push({curr, it.f - prev});
                     ^~~~
                     char
prog.cpp:31:11: error: expected ‘;’ before ‘inter’
         ll inter = min(m, it.s);
           ^~~~~~
           ;
prog.cpp:32:9: error: ‘ans’ was not declared in this scope
         ans += inter * it.f;
         ^~~
prog.cpp:32:16: error: ‘inter’ was not declared in this scope
         ans += inter * it.f;
                ^~~~~
prog.cpp:32:16: note: suggested alternative: ‘int’
         ans += inter * it.f;
                ^~~~~
                int
prog.cpp:35:5: error: ‘cout’ was not declared in this scope
     cout << ans <<endl;
     ^~~~
prog.cpp:35:13: error: ‘ans’ was not declared in this scope
     cout << ans <<endl;
             ^~~
prog.cpp:35:19: error: ‘endl’ was not declared in this scope
     cout << ans <<endl;
                   ^~~~
prog.cpp:35:19: note: suggested alternative: ‘enum’
     cout << ans <<endl;
                   ^~~~
                   enum

Standard output is empty