Submission #519115

#TimeUsernameProblemLanguageResultExecution timeMemory
519115AdamGSThe Kingdom of JOIOI (JOI17_joioi)C++17
100 / 100
1092 ms70504 KiB
#include<bits/stdc++.h> using namespace std; typedef long long ll; typedef long double ld; #define rep(a, b) for(int a = 0; a < (b); ++a) #define st first #define nd second #define pb push_back #define all(a) a.begin(), a.end() const int LIM=2e3+7, INF=1e9+7; int A[LIM][LIM], T[LIM][LIM], n, m; bool f(int x) { int ma=0, mi=INF; rep(i, n) rep(j, m) { ma=max(ma, A[i][j]); mi=min(mi, A[i][j]); } rep(i, n) rep(j, m) { T[i][j]=0; if(A[i][j]-mi<=x) ++T[i][j]; if(ma-A[i][j]<=x) T[i][j]+=2; if(!T[i][j]) return false; } bool ok=true; int lst=m; rep(i, n) { int akt=0; while(akt<lst && T[i][akt]!=1) ++akt; lst=akt; for(int j=m-1; j>=akt; --j) if(T[i][j]==2) ok=false; } if(ok) return true; ok=true; lst=m; rep(i, n) { int akt=0; while(akt<lst && T[i][akt]!=2) ++akt; lst=akt; for(int j=m-1; j>=akt; --j) if(T[i][j]==1) ok=false; } if(ok) return true; ok=true; lst=-1; rep(i, n) { int akt=m-1; while(akt>lst && T[i][akt]!=1) --akt; lst=akt; for(int j=akt; j>=0; --j) if(T[i][j]==2) ok=false; } if(ok) return true; ok=true; lst=-1; rep(i, n) { int akt=m-1; while(akt>lst && T[i][akt]!=2) --akt; lst=akt; for(int j=akt; j>=0; --j) if(T[i][j]==1) ok=false; } return ok; } int main() { ios_base::sync_with_stdio(0); cin.tie(0); cin >> n >> m; rep(i, n) rep(j, m) cin >> A[i][j]; int p=0, k=INF; while(p<k) { int sr=(p+k)/2; if(f(sr)) k=sr; else p=sr+1; } cout << p << '\n'; }
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