제출 #656306

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
656306		Lobo	메기 농장 (IOI22_fish)	C++17	37 / 100	1095 ms	176956 KiB

fish

#include "fish.h"
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define mp make_pair
#define fr first
#define sc second
#define all(x) x.begin(),x.end()

const int maxn = 1e5+10;
const int maxqh = 12;
const int inf = 1e18+10;

int n, m, dp[maxn][maxqh][maxqh];
map<int,int> pf[maxn];
vector<pair<int,int>> fish[maxn]; // fishs from column i
vector<int> hr[maxn]; // important heights from column i, the ones that can be chosen

long long max_weights(int32_t N, int32_t M, vector<int32_t> X, vector<int32_t> Y, vector<int32_t> W) {
    n = N;
    m = M;

    for(int i = 0; i < m; i++) {
        fish[X[i]+1].pb(mp(Y[i]+1,W[i]));
        hr[X[i]+1].pb(Y[i]);
    }

    for(int i = 0; i <= n; i++) {
        hr[i].pb(0);
        hr[i].pb(n);
        sort(all(hr[i]));
        sort(all(fish[i]));
        hr[i].erase(unique(all(hr[i])),hr[i].end());
        // Store only the relevant heights
    }

    for(int i = 1; i <= n; i++) {
        for(auto j : hr[i-1]) pf[i][j] = 0;
        for(auto j : hr[i]) pf[i][j] = 0;
        for(auto j : hr[i+1]) pf[i][j] = 0;

        for(auto aux : fish[i]) {
            int y = aux.fr;
            int w = aux.sc;
            pf[i][y]+= w;
        }
        // Do a prefix sum on the weight of the fishs
        pf[i][0] = 0;
        for(auto it = next(pf[i].begin()); it != pf[i].end(); it++) {
            it->sc+= prev(it)->sc;
        }
    }

    //dp[i][h0][0/1] = until i, with h[i] = hr[i][h0] 
    // and it's greater/smaller tha the previous

    // dp[i][h1][h] = until i and with h[i-1] = hr[i-1][h1] and h[i] = hr[i][h]

    // dp[1][0][x] = 0;
    for(int i = 0; i < hr[1].size(); i++) dp[1][0][i] = 0;
    for(int i = 2; i <= n; i++) {
        for(int h1 = 0; h1 < hr[i-1].size(); h1++) {
            for(int h = 0; h < hr[i].size(); h++) {
                dp[i][h1][h] = 0;

                int plus10 = max((int) 0,pf[i][hr[i-1][h1]]-pf[i][hr[i][h]]);

                for(int h2 = 0; h2 < hr[i-2].size(); h2++) {
                    // fishs that 0 catchs in 1 and had not been caught by 2
                    // I catch every fish between h(i) and max(h(i-1),h(i-2)) + 1
                    int plus01 = max((int) 0, pf[i-1][hr[i][h]]-pf[i-1][max(hr[i-1][h1],hr[i-2][h2])]);
                    dp[i][h1][h] = max(dp[i][h1][h],dp[i-1][h2][h1]+plus01 + plus10);
                 }
            }
        }
    }

    int ans = 0;
    for(int h = 0; h < hr[n].size(); h++) {
        for(int h1 = 0; h1 < hr[n-1].size(); h1++) {
            ans = max(ans,dp[n][h1][h]);
        }
    }
    return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

fish.cpp: In function 'long long int max_weights(int32_t, int32_t, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:61:22: 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]
   61 |     for(int i = 0; i < hr[1].size(); i++) dp[1][0][i] = 0;
      |                    ~~^~~~~~~~~~~~~~
fish.cpp:63:28: 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]
   63 |         for(int h1 = 0; h1 < hr[i-1].size(); h1++) {
      |                         ~~~^~~~~~~~~~~~~~~~
fish.cpp:64:30: 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]
   64 |             for(int h = 0; h < hr[i].size(); h++) {
      |                            ~~^~~~~~~~~~~~~~
fish.cpp:69:36: 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]
   69 |                 for(int h2 = 0; h2 < hr[i-2].size(); h2++) {
      |                                 ~~~^~~~~~~~~~~~~~~~
fish.cpp:80:22: 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]
   80 |     for(int h = 0; h < hr[n].size(); h++) {
      |                    ~~^~~~~~~~~~~~~~
fish.cpp:81:28: 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]
   81 |         for(int h1 = 0; h1 < hr[n-1].size(); h1++) {
      |                         ~~~^~~~~~~~~~~~~~~~

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