Submission #1079703

#	Time	Username	Problem	Language	Result	Execution time	Memory
1079703		ArthuroWich	Catfish Farm (IOI22_fish)	C++17	9 / 100	97 ms	22636 KiB

fish

#include "fish.h"
#include<bits/stdc++.h>
using namespace std;
#define int long long int
vector<vector<int>> ind;
vector<vector<pair<int, int>>> pref;
int query(int i, int j) {
    return (upper_bound(pref[i].begin(), pref[i].end(), std::make_pair(j, LLONG_MAX)) - 1)->second;
}
int max_weights(int32_t N, int32_t M, vector<int32_t> X, vector<int32_t> Y, vector<int32_t> W) {
    int n = N, m = M;
    pref.resize(n+5, vector<pair<int, int>>(1, {INT64_MIN, 0}));
    ind.resize(n+5);
    for (int i = 0; i < m; i++) {
        pref[X[i]+1].push_back({Y[i], W[i]});
    }
    for (int i = 1; i <= n; i++) {
        sort(pref[i].begin(), pref[i].end());
    }
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j < pref[i].size(); i++) {
            pref[i][j].second += pref[i][j-1].second;
        }
    }
    ind[0].push_back(-1);
    ind[n+1].push_back(-1);
    for (int i = 1; i <= n; i++) {
        for (auto [a, b] : pref[i-1]) {
            ind[i].push_back(max(-1LL, a));
        }
        for (auto [a, b] : pref[i+1]) {
            ind[i].push_back(max(-1LL, a));
        }
        sort(ind[i].begin(), ind[i].end());
        ind[i].erase(unique(ind[i].begin(), ind[i].end()), ind[i].end());
    }
    vector<int> dp0(1, 0), dp1(1, 0); // 0 is increasing, 1 is decreasing, increasing can go to decreasing, decreasing cant go to increasing if next to eachother
    for (int i = 1; i <= n+1; i++) {
        vector<int> tdp0(ind[i].size()+5, 0), tdp1(ind[i].size()+5, 0);
        int v = 0, k = 0;
        for (int j = 0; j < ind[i].size(); j++) {
            while(k < ind[i-1].size() && ind[i-1][k] <= ind[i][j]) {
                v = max(v, dp0[k]-query(i-1, ind[i-1][k]));
                k++;
            }
            tdp0[j] = max(v+query(i-1, ind[i][j]), dp1[0]);
        }
        v = 0, k = ind[i-1].size();
        for (int j = ind[i].size()-1; j >= 0; j--) {
            while(k > 0 && ind[i-1][k-1] >= ind[i][j]) {
                k--;
                v = max(v, max(dp0[k], dp1[k])+query(i, ind[i-1][k]));
            }
            tdp1[j] = v-query(i, ind[i][j]);
        }
        swap(dp0, tdp0);
        swap(dp1, tdp1);
    }
    int ans = max(dp0[0], dp1[0]);
    return ans;
}

Compilation message (stderr)

fish.cpp: In function 'long long int max_weights(int32_t, int32_t, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:21:27: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |         for (int j = 1; j < pref[i].size(); i++) {
      |                         ~~^~~~~~~~~~~~~~~~
fish.cpp:41:27: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |         for (int j = 0; j < ind[i].size(); j++) {
      |                         ~~^~~~~~~~~~~~~~~
fish.cpp:42:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |             while(k < ind[i-1].size() && ind[i-1][k] <= ind[i][j]) {
      |                   ~~^~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 3
• Subtask 2: 0 / 6
• Subtask 3: 9 / 9
• Subtask 4: 0 / 14
• Subtask 5: 0 / 21
• Subtask 6: 0 / 17
• Subtask 7: 0 / 14
• Subtask 8: 0 / 16