Submission #830933

#TimeUsernameProblemLanguageResultExecution timeMemory
830933YassineBenYounesThe Kingdom of JOIOI (JOI17_joioi)C++17
60 / 100
465 ms262144 KiB
#include<bits/stdc++.h> using namespace std; void init(){ #ifndef ONLINE_JUDGE freopen("input.txt", "r", stdin); freopen("output.txt", "w", stdout); #endif // ONLINE_JUDGE } typedef long long ll; #define int ll #define pii pair<int, int> #define ff first #define ss second #define vii vector<pii> #define pb push_back #define vi vector<int> const int mx = 2000; const int inf = 1e15; const int LOG = 22; int n, m; int grid[mx][mx]; int prefmin1[mx][mx]; int prefmin[mx][mx]; int prefmin2[mx][mx]; int prefmin3[mx][mx]; int prefmax1[mx][mx]; int prefmax[mx][mx]; int prefmax2[mx][mx]; int prefmax3[mx][mx]; vector<vi> v; void preprocess(){ for(int i = 0; i < n;i++){ for(int j = 0;j < m;j++){ int x = inf, y = inf; if(i > 0)x = prefmin[i-1][j]; if(j > 0)y = prefmin[i][j-1]; prefmin[i][j] = min(x, y); prefmin[i][j] = min(prefmin[i][j], grid[i][j]); } } for(int i = 0; i < n;i++){ for(int j = 0;j < m;j++){ int x = 0, y = 0; if(i > 0)x = prefmax[i-1][j]; if(j > 0)y = prefmax[i][j-1]; prefmax[i][j] = max(x, y); prefmax[i][j] = max(prefmax[i][j], grid[i][j]); } } // 1 : for(int i = n-1; i >= 0;i--){ for(int j = 0;j < m;j++){ int x = inf, y = inf; if((i+1) < n)x = prefmin1[i+1][j]; if(j > 0)y = prefmin1[i][j-1]; prefmin1[i][j] = min(x, y); prefmin1[i][j] = min(prefmin1[i][j], grid[i][j]); } } for(int i = n-1; i >= 0;i--){ for(int j = 0;j < m;j++){ int x = 0, y = 0; if((i+1) < n)x = prefmax1[i+1][j]; if(j > 0)y = prefmax1[i][j-1]; prefmax1[i][j] = max(x, y); prefmax1[i][j] = max(prefmax1[i][j], grid[i][j]); } } // 2 : for(int i = 0; i < n;i++){ for(int j = m-1;j >= 0;j--){ int x = inf, y = inf; if(i > 0)x = prefmin2[i-1][j]; if((j+1) < m)y = prefmin2[i][j+1]; prefmin2[i][j] = min(x, y); prefmin2[i][j] = min(prefmin2[i][j], grid[i][j]); } } for(int i = 0; i < n;i++){ for(int j = m-1;j >= 0;j--){ int x = 0, y = 0; if(i > 0)x = prefmax2[i-1][j]; if((j+1) < m)y = prefmax2[i][j+1]; prefmax2[i][j] = max(x, y); prefmax2[i][j] = max(prefmax2[i][j], grid[i][j]); } } // 3: for(int i = n-1; i >= 0;i--){ for(int j = m-1;j >= 0;j--){ int x = inf, y = inf; if((i+1) < n)x = prefmin3[i+1][j]; if((j+1) < m)y = prefmin3[i][j+1]; prefmin3[i][j] = min(x, y); prefmin3[i][j] = min(prefmin3[i][j], grid[i][j]); } } for(int i = n-1; i >= 0;i--){ for(int j = m-1;j >= 0;j--){ int x = 0, y = 0; if((i+1) < n)x = prefmax3[i+1][j]; if((j+1) < m)y = prefmax3[i][j+1]; prefmax3[i][j] = max(x, y); prefmax3[i][j] = max(prefmax3[i][j], grid[i][j]); } } } int32_t main(){ cin.tie();cout.tie();ios::sync_with_stdio(false); cin >> n >> m; for(int i = 0; i < n;i++){ for(int j = 0;j < m;j++){ cin >> grid[i][j]; v.pb({grid[i][j], i, j}); } } preprocess(); int res = inf; sort(v.begin(), v.end()); int a = inf, b = -inf; for(int i = 0; i < v.size();i++){ if(i > 0){ int x = v[i-1][1], y = v[i-1][2]; a = min(a, prefmin[x][y]); b = max(b, prefmax[x][y]); } res = min(res, max(v[v.size()-1][0] - v[i][0], b-a)); } a = inf, b = -inf; for(int i = 0; i < v.size();i++){ if(i > 0){ int x = v[i-1][1], y = v[i-1][2]; a = min(a, prefmin1[x][y]); b = max(b, prefmax1[x][y]); } res = min(res, max(v[v.size()-1][0] - v[i][0], b-a)); } a = inf, b = -inf; for(int i = 0; i < v.size();i++){ if(i > 0){ int x = v[i-1][1], y = v[i-1][2]; a = min(a, prefmin2[x][y]); b = max(b, prefmax2[x][y]); } res = min(res, max(v[v.size()-1][0] - v[i][0], b-a)); } a = inf, b = -inf; for(int i = 0; i < v.size();i++){ if(i > 0){ int x = v[i-1][1], y = v[i-1][2]; a = min(a, prefmin3[x][y]); b = max(b, prefmax3[x][y]); } res = min(res, max(v[v.size()-1][0] - v[i][0], b-a)); } cout << res << endl; }

Compilation message (stderr)

joioi.cpp: In function 'int32_t main()':
joioi.cpp:130:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  130 |     for(int i = 0; i < v.size();i++){
      |                    ~~^~~~~~~~~~
joioi.cpp:139:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  139 |     for(int i = 0; i < v.size();i++){
      |                    ~~^~~~~~~~~~
joioi.cpp:148:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  148 |     for(int i = 0; i < v.size();i++){
      |                    ~~^~~~~~~~~~
joioi.cpp:157:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  157 |     for(int i = 0; i < v.size();i++){
      |                    ~~^~~~~~~~~~
joioi.cpp: In function 'void init()':
joioi.cpp:6:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    6 | freopen("input.txt", "r", stdin);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
joioi.cpp:8:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 | freopen("output.txt", "w", stdout);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
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