This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "fish.h"
#include "bits/stdc++.h"
#include <vector>
struct CaF {
long long x, w;
};
using ll = long long;
long long max_weights(int N, int M, std::vector<int> X, std::vector<int> Y,
std::vector<int> W) {
using namespace std;
vector<vector<CaF>> fi(N);
for (int i = 0; i < N; ++i) {
fi[i].push_back({-1, 0});
}
for (int i = 0; i < M; ++i) {
fi[X[i]].push_back({Y[i], W[i]});
}
for (int i = 0; i < N; ++i) {
sort(fi[i].begin(), fi[i].end(), [](const CaF &l, const CaF &r) { return l.x < r.x; });
}
vector<ll> dpU(fi[0].size()), dpD(fi[0].size());
for (int i = 1; i < N; ++i) {
vector<ll> dpNU(fi[i].size()), dpND(fi[i].size()), dp0(fi[i].size());
int laP = 0;
ll su = 0;
ll beSu = 1e9;
int be = 0;
for (int j = 0; j < fi[i].size(); ++j) {
while (laP < fi[i - 1].size() && (j == fi[i].size() - 1 || fi[i - 1][laP].x < fi[i][j + 1].x)) {
su += fi[i - 1][laP].w;
if (dpU[laP] - su > dpU[be] - beSu) {
be = laP;
beSu = su;
}
laP++;
}
dpNU[j] = dpU[be] + su - beSu;
}
laP = fi[i - 1].size() - 1;
su = 0;
beSu = 0;
be = fi[i - 1].size() - 1;
for (int j = fi[i].size() - 1; j >= 0; --j) {
while (laP >= 0 && fi[i - 1][laP].x > fi[i][j].x) {
laP--;
if (dpD[laP] - su > dpD[be] - beSu) {
be = laP;
beSu = su;
}
}
dpND[j] = max(dpD[be] + su - beSu, dpNU[j]);
su += fi[i][j].w;
}
laP = 0;
su = 0;
for (int j = 0; j < fi[i - 1].size(); ++j) {
while (laP < fi[i].size() && (j == fi[i - 1].size() - 1 || fi[i - 1][j + 1].x > fi[i][laP].x)) {
su += fi[i][laP].w;
dp0[laP] = dpD[j] + su;
laP++;
}
dp0[laP - 1] = max(dpD[j] + su, dp0[laP - 1]);
}
for (int j = dp0.size() - 1; j >= 0; --j) {
dpNU[j] = max(dp0[j], dpNU[j]);
}
dpD = dpND;
dpU = dpNU;
}
return max(*max_element(dpU.begin(), dpU.end()), *max_element(dpD.begin(), dpD.end()));
}
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:32:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<CaF>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
32 | for (int j = 0; j < fi[i].size(); ++j) {
| ~~^~~~~~~~~~~~~~
fish.cpp:33:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<CaF>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
33 | while (laP < fi[i - 1].size() && (j == fi[i].size() - 1 || fi[i - 1][laP].x < fi[i][j + 1].x)) {
| ~~~~^~~~~~~~~~~~~~~~~~
fish.cpp:33:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<CaF>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
33 | while (laP < fi[i - 1].size() && (j == fi[i].size() - 1 || fi[i - 1][laP].x < fi[i][j + 1].x)) {
| ~~^~~~~~~~~~~~~~~~~~~
fish.cpp:60:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<CaF>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
60 | for (int j = 0; j < fi[i - 1].size(); ++j) {
| ~~^~~~~~~~~~~~~~~~~~
fish.cpp:61:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<CaF>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
61 | while (laP < fi[i].size() && (j == fi[i - 1].size() - 1 || fi[i - 1][j + 1].x > fi[i][laP].x)) {
| ~~~~^~~~~~~~~~~~~~
fish.cpp:61:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<CaF>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
61 | while (laP < fi[i].size() && (j == fi[i - 1].size() - 1 || fi[i - 1][j + 1].x > fi[i][laP].x)) {
| ~~^~~~~~~~~~~~~~~~~~~~~~~
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