Submission #848732

#	Time	Username	Problem	Language	Result	Execution time	Memory
848732		lbadea1000	Split the sequence (APIO14_sequence)	C++17	0 / 100	1 ms	556 KiB

sequence

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

const int NMAX = 1e5;

int v[NMAX], sp[NMAX];

vector<int> split_points;

int sum(int l, int r) {
    if(l == 0) return sp[r];
    return sp[r] - sp[l - 1];
}

int main() {
    int n, k;
    FILE *fin, *fout;
    fin = fopen("sequence.in", "r");
    fout = fopen("sequence.out", "w");
    fscanf(fin, "%d%d", &n, &k);
    for(int i = 0; i < n; i++)
        fscanf(fin, "%d", &v[i]);
    sp[0] = v[0];
    for(int i = 1; i < n; i++)
        sp[i] = sp[i - 1] + v[i];
    
    long long ans = 0;
    int kk = k;
    while(kk--) {
        int first = -1, end;
        int ind = 0;
        long long maxx = 0, pozmax = 0;
        if(split_points.size() == 0)
            end = n - 1;
        else end = split_points[0];
        for(int i = 0; i < n; i++) {
            if(ind < split_points.size() && i == split_points[ind]) {
                first = split_points[ind];
                ind++;
                if(ind == split_points.size())
                    end = n - 1;
                else end = split_points[ind];
            } else {
                // (first, i] cu [i + 1, end]
                //cout << i << ' ' << first << ' ' << end << endl;
                long long val = 1LL * sum(first + 1, i) * sum(i + 1, end);
                if(val >= maxx) {
                    maxx = val;
                    pozmax = i;
                }
            }
        }
        //cout << maxx << ' ' << pozmax << endl;
        ans += maxx;
        split_points.push_back(pozmax);
        sort(split_points.begin(), split_points.end());
    }
    fprintf(fout, "%lld\n", ans);
    //cout << ans << ' ' << k << endl;
    for(int i = 0; i < k; i++)
        fprintf(fout, "%d ", split_points[i] + 1);
    fclose(fin);
    fclose(fout);
    return 0;
}

Compilation message (stderr)

sequence.cpp: In function 'int main()':
sequence.cpp:37:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |             if(ind < split_points.size() && i == split_points[ind]) {
      |                ~~~~^~~~~~~~~~~~~~~~~~~~~
sequence.cpp:40:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |                 if(ind == split_points.size())
      |                    ~~~~^~~~~~~~~~~~~~~~~~~~~~
sequence.cpp:20:11: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |     fscanf(fin, "%d%d", &n, &k);
      |     ~~~~~~^~~~~~~~~~~~~~~~~~~~~
sequence.cpp:22:15: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         fscanf(fin, "%d", &v[i]);
      |         ~~~~~~^~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 11
• Subtask 3: 0 / 11
• Subtask 4: 0 / 17
• Subtask 5: 0 / 21
• Subtask 6: 0 / 29