Submission #481346

#	Time	Username	Problem	Language	Result	Execution time	Memory
481346		Lobo	The Kingdom of JOIOI (JOI17_joioi)	C++17	0 / 100	1 ms	204 KiB

joioi

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

const long long INFll = (long long) 1e18 + 10;
const int INFii = (int) 1e9 + 10;
typedef long long ll;
typedef int ii;
typedef long double dbl;
#define endl '\n'
#define sc second
#define fr first
#define mp make_pair
#define pb push_back
#define all(x) x.begin(), x.end()

#define maxn 2002

ii n, m, a;
pair<ii,ii> p[maxn];

int main() {
    ios::sync_with_stdio(false); cin.tie(0);

    //freopen("in.in", "r", stdin);
    //freopen("out.out", "w", stdout);

    cin >> n >> m;

    ii mn = INFii;
    ii mx = 0;

    vector<pair<ii,pair<ii,ii>>> pq1,pq2;
    for(ii i = 1; i <= n; i++) {
        for(ii j = 1; j <= m; j++) {
            cin >> a;
            pq1.pb(mp(a,mp(i,j)));
            pq2.pb(mp(a,mp(i,j)));

            mn = min(mn,a);
            mx = max(mx,a);
        }
    }

    sort(all(pq1));
    sort(all(pq2),greater<pair<ii,pair<ii,ii>>>());

    if(mn == mx) {
        cout << 0 << endl;
        return 0;
    }

    // com minimo na esquerda:

    ii l = 0;
    ii r = 1e9+1;
    ii ans1;

    while(l <= r) {
        ii mid = (l+r)/2;
        for(ii i = 1; i <= n; i++) {
            p[i].fr = 0;
            p[i].sc = m+1;
        }

        for(ii i = 0; i < pq2.size() && pq2[i].fr-mn >= mid; i++) {
            auto x = pq1[i].sc;

            p[x.fr].fr = max(p[x.fr].fr,x.sc);
        }
    

        for(ii i = 0; i < pq1.size() && mx-pq1[i].fr >= mid; i++) {
            auto x = pq1[i].sc;

            p[x.fr].sc = min(p[x.fr].sc,x.sc-1);
        }

        //ver se ta crescente/decrescente
        ii actc = 0; bool okc = 1;
        ii actd = m+1; bool okd = 1;

        for(ii i = 1; i <= n; i++) {
            actc = max(actc,p[i].fr);
            if(actc > p[i].sc || p[i].fr > p[i].sc) okc = 0;

            actd = min(actd,p[i].sc);
            if(actd < p[i].fr || p[i].fr > p[i].sc) okd = 0;
        }

        if(okc || okd) {
            //se deu bom com esse (l+r)/2 quero abaixar o (l+r)/2
            ans1 = (l+r)/2-1;
            r = (l+r)/2-1;
        }
        else {
            l = (l+r)/2+1;
        }
    }

    //com mx na esquerda

    l = 0;
    r = 1e9+1;
    ii ans2;


    while(l <= r) {
        ii mid = (l+r)/2;
        for(ii i = 1; i <= n; i++) {
            p[i].fr = 0;
            p[i].sc = m+1;
        }

        for(ii i = 0; i < pq2.size() && pq2[i].fr-mn >= mid; i++) {
            auto x = pq2[i].sc;
            p[x.fr].sc = min(p[x.fr].sc,x.sc-1);
        }
    

        for(ii i = 0; i < pq1.size() && mx-pq1[i].fr >= mid; i++) {
            auto x = pq1[i].sc;
            p[x.fr].fr = max(p[x.fr].fr,x.sc);

        }

        //ver se ta crescente/decrescente
        ii actc = 0; bool okc = 1;
        ii actd = m+1; bool okd = 1;

        for(ii i = 1; i <= n; i++) {
            actc = max(actc,p[i].fr);
            if(actc > p[i].sc || p[i].fr > p[i].sc) okc = 0;

            actd = min(actd,p[i].sc);
            if(actd < p[i].fr || p[i].fr > p[i].sc) okd = 0;
        }

        if(okc || okd) {
            //se deu bom com esse (l+r)/2 quero abaixar o (l+r)/2
            ans1 = (l+r)/2-1;
            r = (l+r)/2-1;
        }
        else {
            l = (l+r)/2+1;
        }
    }

    cout << min(ans1,ans1) << endl;

}

Compilation message (stderr)

joioi.cpp: In function 'int main()':
joioi.cpp:66:25: warning: comparison of integer expressions of different signedness: 'ii' {aka 'int'} and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |         for(ii i = 0; i < pq2.size() && pq2[i].fr-mn >= mid; i++) {
      |                       ~~^~~~~~~~~~~~
joioi.cpp:73:25: warning: comparison of integer expressions of different signedness: 'ii' {aka 'int'} and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |         for(ii i = 0; i < pq1.size() && mx-pq1[i].fr >= mid; i++) {
      |                       ~~^~~~~~~~~~~~
joioi.cpp:115:25: warning: comparison of integer expressions of different signedness: 'ii' {aka 'int'} and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  115 |         for(ii i = 0; i < pq2.size() && pq2[i].fr-mn >= mid; i++) {
      |                       ~~^~~~~~~~~~~~
joioi.cpp:121:25: warning: comparison of integer expressions of different signedness: 'ii' {aka 'int'} and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  121 |         for(ii i = 0; i < pq1.size() && mx-pq1[i].fr >= mid; i++) {
      |                       ~~^~~~~~~~~~~~
joioi.cpp:105:8: warning: unused variable 'ans2' [-Wunused-variable]
  105 |     ii ans2;
      |        ^~~~
joioi.cpp:10:14: warning: 'ans1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   10 | #define endl '\n'
      |              ^~~~
joioi.cpp:57:8: note: 'ans1' was declared here
   57 |     ii ans1;
      |        ^~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 45
• Subtask 3: 0 / 40