Submission #858838

#TimeUsernameProblemLanguageResultExecution timeMemory
858838LucaIlieCatfish Farm (IOI22_fish)C++17
9 / 100
714 ms320876 KiB
#include "fish.h" #include <bits/stdc++.h> using namespace std; const int MAX_N = 3e5 + 2; const long long INF = 1e18; unordered_map<int, long long> costCell[MAX_N], dp[MAX_N], dpLower[MAX_N], spX[MAX_N], maxPref1[MAX_N], maxSuf2[MAX_N], maxPref3[MAX_N]; vector <int> ys[MAX_N]; long long max_weights( int n, int m, vector <int> X, vector <int> Y, vector <int> W ) { for ( int i = 0; i < m; i++ ) { X[i]++; Y[i]++; costCell[X[i]][Y[i]] = W[i]; ys[X[i] - 1].push_back( Y[i] ); ys[X[i] + 1].push_back( Y[i] ); } ys[0].clear(); ys[n + 1].clear(); for ( int x = 0; x <= n + 1; x++ ) ys[x].push_back( 0 ); for ( int x = 1; x <= n; x++ ) { sort( ys[x].begin(), ys[x].end() ); ys[x].resize( unique( ys[x].begin(), ys[x].end() ) - ys[x].begin() ); } for ( int x = 1; x <= n; x++ ) { vector<int> yss; for ( int i = 0; i < ys[x].size(); i++ ) yss.push_back( ys[x][i] ); for ( int i = 0; i < ys[x - 1].size(); i++ ) yss.push_back( ys[x - 1][i] ); for ( int i = 0; i < ys[x + 1].size(); i++ ) yss.push_back( ys[x + 1][i] ); sort( yss.begin(), yss.end() ); yss.resize( unique( yss.begin(), yss.end() ) - yss.begin() ); for ( int i = 1; i < yss.size(); i++ ) spX[x][yss[i]] = spX[x][yss[i - 1]] + costCell[x][yss[i]]; } dp[0][0] = dpLower[0][0] = 0; for ( int x = 1; x <= n + 1; x++ ) { int lower1 = 0, upper1 = 0, lower2 = 0, upper2 = 0; for ( int i = 0; i < ys[x].size(); i++ ) { int crtY = ys[x][i]; dp[x][crtY] = dpLower[x][crtY] = -INF; if ( x >= 1 ) { while ( lower1 + 1 < ys[x - 1].size() && ys[x - 1][lower1 + 1] <= crtY ) lower1++; while ( upper1 < ys[x - 1].size() && ys[x - 1][upper1] < crtY ) upper1++; if ( lower1 >= 0 ) { int prevY = ys[x - 1][lower1]; dpLower[x][i] = max( dpLower[x][i], maxPref1[x - 1][lower1] + spX[x - 1][crtY] ); dp[x][i] = max( dp[x][i], maxPref1[x - 1][lower1] + spX[x - 1][crtY] ); } if ( upper1 < ys[x - 1].size() ) { int prevY = ys[x - 1][upper1]; dp[x][i] = max( dp[x][i], maxSuf2[x - 1][upper1] - spX[x][crtY] ); } } if ( x >= 2 ) { while ( lower2 + 1 < ys[x - 2].size() && ys[x - 2][lower2 + 1] <= crtY ) lower2++; while ( upper2 < ys[x - 2].size() && ys[x - 2][upper2] < crtY ) upper2++; if ( lower2 >= 0 ) { int prevY = ys[x - 2][lower2]; dpLower[x][i] = max( dpLower[x][i], maxPref3[x - 2][lower2] + spX[x - 1][i] ); dp[x][i] = max( dp[x][i], maxPref3[x - 2][lower2] + spX[x - 1][crtY] ); } if ( upper2 < ys[x - 2].size() ) { int prevY = ys[x - 2][upper2]; dpLower[x][i] = max( dpLower[x][i], maxSuf2[x - 2][upper2] ); dp[x][i] = max( dp[x][i], maxSuf2[x - 2][upper2] ); } } maxPref1[x][i] = dpLower[x][i] - spX[x][crtY]; maxSuf2[x][i] = dp[x][i] + spX[x + 1][crtY]; maxPref3[x][i] = dpLower[x][i]; } for ( int i = 1; i < ys[x].size(); i++ ) { maxPref1[x][ys[x][i]] = max( maxPref1[x][i], maxPref1[x][i - 1] ); maxPref3[x][ys[x][i]] = max( maxPref3[x][i], maxPref3[x][i - 1] ); } for ( int i = ys[x].size() - 2; i >= 0; i-- ) maxSuf2[x][ys[x][i]] = max( maxSuf2[x][i], maxSuf2[x][i + 1] ); } /*for ( int x = 0; x <= n + 1; x++ ) { for ( int i = 0; i < ys[x].size(); i++ ) printf( "(%d %lld) ", ys[x][i], dp[x][i] ); printf( "\n" ); }*/ return dp[n + 1][0]; }

Compilation message (stderr)

fish.cpp: In function 'long long int max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:32:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |         for ( int i = 0; i < ys[x].size(); i++ )
      |                          ~~^~~~~~~~~~~~~~
fish.cpp:34:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |         for ( int i = 0; i < ys[x - 1].size(); i++ )
      |                          ~~^~~~~~~~~~~~~~~~~~
fish.cpp:36:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |         for ( int i = 0; i < ys[x + 1].size(); i++ )
      |                          ~~^~~~~~~~~~~~~~~~~~
fish.cpp:40:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |         for ( int i = 1; i < yss.size(); i++ )
      |                          ~~^~~~~~~~~~~~
fish.cpp:47:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         for ( int i = 0; i < ys[x].size(); i++ ) {
      |                          ~~^~~~~~~~~~~~~~
fish.cpp:52:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |                 while ( lower1 + 1 < ys[x - 1].size() && ys[x - 1][lower1 + 1] <= crtY )
      |                         ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
fish.cpp:54:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |                 while ( upper1 < ys[x - 1].size() && ys[x - 1][upper1] < crtY )
      |                         ~~~~~~~^~~~~~~~~~~~~~~~~~
fish.cpp:58:25: warning: unused variable 'prevY' [-Wunused-variable]
   58 |                     int prevY = ys[x - 1][lower1];
      |                         ^~~~~
fish.cpp:62:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |                 if ( upper1 < ys[x - 1].size() ) {
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~
fish.cpp:63:25: warning: unused variable 'prevY' [-Wunused-variable]
   63 |                     int prevY = ys[x - 1][upper1];
      |                         ^~~~~
fish.cpp:69:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   69 |                 while ( lower2 + 1 < ys[x - 2].size() && ys[x - 2][lower2 + 1] <= crtY )
      |                         ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
fish.cpp:71:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |                 while ( upper2 < ys[x - 2].size() && ys[x - 2][upper2] < crtY )
      |                         ~~~~~~~^~~~~~~~~~~~~~~~~~
fish.cpp:75:25: warning: unused variable 'prevY' [-Wunused-variable]
   75 |                     int prevY = ys[x - 2][lower2];
      |                         ^~~~~
fish.cpp:79:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |                 if ( upper2 < ys[x - 2].size() ) {
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~
fish.cpp:80:25: warning: unused variable 'prevY' [-Wunused-variable]
   80 |                     int prevY = ys[x - 2][upper2];
      |                         ^~~~~
fish.cpp:91:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |         for ( int i = 1; i < ys[x].size(); i++ ) {
      |                          ~~^~~~~~~~~~~~~~
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