Submission #636124

#	Time	Username	Problem	Language	Result	Execution time	Memory
636124		aris12345678	Baloni (COCI15_baloni)	C++14	100 / 100	123 ms	34396 KiB

baloni

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

const int mxN = 1e6+5;
int par[mxN], sz[mxN];
vector<int> pos[mxN];

void make_set(int x) {
    par[x] = x, sz[x] = 1;
}

int find_set(int x) {
    return par[x] == x ? x : par[x] = find_set(par[x]);
}

bool union_sets(int x, int y) {
    x = find_set(x), y = find_set(y);
    if(x == y)
        return false;
    if(sz[x] < sz[y])
        swap(x, y);
    par[y] = x, sz[x] += sz[y];
    return true;
}

int main() {
    int n;
    scanf("%d", &n);
    for(int i = 0; i < n; i++)
        make_set(i);
    int ans = n;
    for(int i = 0; i < n; i++) {
        int x;
        scanf("%d", &x);
        pos[x].push_back(i);
        if(!pos[x+1].empty()) {
            if(union_sets(i, pos[x+1].back()))
                ans--;
            pos[x+1].pop_back();
        }
    }
    printf("%d\n", ans);
    return 0;
}

Compilation message (stderr)

baloni.cpp: In function 'int main()':
baloni.cpp:28:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
baloni.cpp:34:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |         scanf("%d", &x);
      |         ~~~~~^~~~~~~~~~

• Subtask 1: 100 / 100