Submission #152640

#TimeUsernameProblemLanguageResultExecution timeMemory
152640karmaThe Kingdom of JOIOI (JOI17_joioi)C++14
60 / 100
4022 ms54824 KiB
#include<bits/stdc++.h> #define pb emplace_back #define mp make_pair #define fi first #define se second #define ll long long using namespace std; const int N = int(2e3) + 7; const int inf = int(1e9) + 7; int n, m, a[N][N], mn, mx, res; bool Check(int dif) { int lim = mn + dif; if(a[0][0] > lim && a[0][m - 1] > lim) return 0; int Mx = 0, Mn = inf, h = n; bool divided; for(int j = 0; j < m; ++j) { divided = 0; if(a[0][j] > lim) h = 0, divided = 1; for(int i = 0; i < n; ++i) { if(a[i][j] > lim) divided = 1, h = min(h, i); else if(i == h) divided = 1; if(divided) Mx = max(Mx, a[i][j]), Mn = min(Mn, a[i][j]); } } if(Mx - Mn <= dif) return 1; h = n, Mx = 0, Mn = inf; for(int j = m - 1; j >= 0; --j) { divided = 0; if(a[0][j] > lim) h = 0, divided = 1; for(int i = 0; i < n; ++i) { if(a[i][j] <= lim && !divided && i < h) continue; if(a[i][j] > lim) divided = 1, h = min(h, i); else if(i == h) divided = 1; Mx = max(Mx, a[i][j]), Mn = min(Mn, a[i][j]); divided = 1; } } return Mx - Mn <= dif; } void Solve() { int low, high, mid; low = 0, high = mx - mn; while(low <= high) { mid = (low + high) >> 1; if(Check(mid)) high = mid - 1; else low = mid + 1; } res = min(res, low); } int main() { ios_base::sync_with_stdio(0); cin.tie(0), cout.tie(0); if(fopen("test.inp", "r")) { freopen("test.inp", "r", stdin); freopen("test.out", "w", stdout); } cin >> n >> m; mn = inf, mx = 0; for(int i = 0; i < n; ++i) { for(int j = 0; j < m; ++j) { cin >> a[i][j]; mn = min(mn, a[i][j]); mx = max(mx, a[i][j]); } } res = mx - mn; Solve(); for(int j = 0; j < m; ++j) { for(int i = 0; n - 1 - i > i; ++i) { swap(a[i][j], a[n - 1 - i][j]); } } Solve(); cout << res; }

Compilation message (stderr)

joioi.cpp: In function 'int main()':
joioi.cpp:60:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         freopen("test.inp", "r", stdin);
         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
joioi.cpp:61:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         freopen("test.out", "w", stdout);
         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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