Submission #164833

#	Time	Username	Problem	Language	Result	Execution time	Memory
164833		ly20	역사적 조사 (JOI14_historical)	C++17	5 / 100	20 ms	1108 KiB

historic

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 112345;
const int sz = sqrt(MAXN) + 10;
int v[MAXN];
long long marc[MAXN];
long long mrk[sz][MAXN];
int sq[MAXN];
map <int, int> mp;
set <int> s;
set <int> :: iterator it;
int ini[sz], fim[sz];
long long rs[sz][sz];
long long imp[MAXN];
int main() {
	int n, q;
	scanf("%d %d", &n, &q);
	int par = (n - 1) / sz + 1;
	for(int i = 0; i < n; i++) {
		scanf("%d", &v[i]);
		s.insert(v[i]);
	}
	int temp = 0;
	for(it = s.begin(); it != s.end(); it++) {
		mp[*it] = temp;
		imp[temp] = *it;
		temp++;
	}
	for(int i = 0; i < n; i++) {
		v[i] = mp[v[i]];
		sq[i] = i / sz;
	}
	for(int i = 0; i < par; i++) {
		ini[i] = i * sz;
		fim[i] = min(n - 1, i * (sz + 1) - 1);
	}
	long long resp;
	for(int i = 0; i < par; i++) {
		resp = 0;
		for(int j = ini[i]; j < n - 1; j++) {
			mrk[i][v[j]]++;
			if(mrk[i][v[j]] * imp[v[j]] > resp) {
				resp = mrk[i][v[j]] * imp[v[j]];
			}
			if(j == fim[sq[j]]) {
				rs[i][sq[j]] = resp;
			}
		}
	}
	for(int i = 0; i < q; i++) {
		int a, b;
		scanf("%d %d", &a, &b); a--; b--;
		if(sq[a] == sq[b]) {
			long long resp = 0;
			for(int j = a; j <= b; j++) {
				marc[v[j]]++;
				resp = max(resp, marc[v[j]] * imp[v[j]]);
			}
			printf("%lld\n", resp);
			for(int j = a; j <= b; j++) marc[v[j]]--;
		}
		else {
			long long resp = rs[sq[a] + 1][sq[b] - 1];
			for(int j = a; j <= fim[sq[a]]; j++) {
				marc[v[j]]++;
				if((marc[v[j]] + mrk[sq[a] + 1][v[j]] - mrk[sq[b]][v[j]]) * imp[v[j]] > resp) {
					resp = (marc[v[j]] + mrk[sq[a] + 1][v[j]] - mrk[sq[b]][v[j]]) * imp[v[j]];
				}
			}
			for(int j = b; j >= ini[sq[b]];j--) {
				marc[v[j]]++;
				if((marc[v[j]] + mrk[sq[a] + 1][v[j]] - mrk[sq[b]][v[j]]) * imp[v[j]] > resp) {
					resp = (marc[v[j]] + mrk[sq[a] + 1][v[j]] - mrk[sq[b]][v[j]]) * imp[v[j]];
				}
			}
			printf("%lld\n", resp);
			for(int j = a; j <= fim[sq[a]]; j++) {
				marc[v[j]]--;
			}
			for(int j = b; j >= ini[sq[b]];j--) {
				marc[v[j]]--;
			}
		}
	}
}

Compilation message (stderr)

historic.cpp: In function 'int main()':
historic.cpp:17:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d", &n, &q);
  ~~~~~^~~~~~~~~~~~~~~~~
historic.cpp:20:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &v[i]);
   ~~~~~^~~~~~~~~~~~~
historic.cpp:52:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &a, &b); a--; b--;
   ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 25
• Subtask 4: 0 / 60