Submission #1072755

#	Time	Username	Problem	Language	Result	Execution time	Memory
1072755		Cyanberry	Global Warming (CEOI18_glo)	C++14	0 / 100	2052 ms	1360 KiB

glo

// earth cooling
#include <bits/stdc++.h>
using namespace std;

int main() {
    int dayc, limit;
    cin>>dayc>>limit;
    int days[dayc];
    for (int i = 0; i < dayc; ++i) {
        cin>>days[i];
    }
    if (limit <= 50) {
        int leftBound, rightBound, modifier, out = 0;
        for (leftBound = 0; leftBound < dayc; ++leftBound) {
            for (rightBound = leftBound + 1; rightBound <= dayc; ++rightBound) {
                for (modifier = 0; modifier < limit; ++modifier) {
                    vector<int> LISs;
                    for (int i = 0; i < dayc; ++i) {
                        int l = -1, r = LISs.size();
                        while (r - l > 1) {
                            int m = (r+l)/2;
                            if (LISs[m] >= days[i] + (i < rightBound && i > leftBound) * modifier) {
                                r = m;
                            } else {
                                l = m;
                            }
                        }
                        if (r == LISs.size()) {
                            LISs.push_back(days[i] + (i < rightBound && i > leftBound) * modifier);
                        } else {
                            LISs[r] = min(LISs[r], days[i] + (i < rightBound && i > leftBound) * modifier);
                        }
                    }
                    out = max(out, int(LISs.size()));
                }
            }
        }
        cout<<out;
    // } else if (days <= 1000) {

    } else {
        int LISs[2][dayc];
        int end1 = 0;
        for (int i=0; i<dayc; ++i) {
            LISs[0][i] = INT_MAX;
            LISs[1][i] = INT_MAX;
        }
        for (int i=0; i < dayc; ++i) {
            if (end1 > 0) {
                int l = -1, r = end1;
                while (r - l > 1) {
                    int m = (r+l)/2;
                    if (LISs[1][m] >= days[i]) {
                        r = m;
                    } else {
                        l = m;
                    }
                }
                LISs[1][r] = min(LISs[1][r], days[i]);
                l = -1, r = end1;
                while (r - l > 1) {
                    int m = (r+l)/2;
                    if (LISs[0][m] >= days[i]) {
                        r = m;
                    } else {
                        l = m;
                    }
                }
                if (LISs[0][r] == -1 || LISs[1][r]) ++end1;
                LISs[0][r] = min(LISs[0][r], days[i]);
                LISs[1][r] = min(LISs[1][r], days[i]);
                LISs[1][end1+1] = min(LISs[1][end1+1], days[i]);
            } else {
                end1 = 1;
                LISs[0][0] = days[i];
                LISs[1][0] = days[i];
            }
        }
        cout<<end1;
    }
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:28:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |                         if (r == LISs.size()) {
      |                             ~~^~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 13
• Subtask 4: 0 / 10
• Subtask 5: 0 / 20
• Subtask 6: 0 / 17
• Subtask 7: 0 / 25