Submission #261039

#	Time	Username	Problem	Language	Result	Execution time	Memory
261039		onjo0127	역사적 조사 (JOI14_historical)	C++11	100 / 100	316 ms	8048 KiB

historic

#include <bits/stdc++.h>
using namespace std;
using pii = pair<int, int>;
const int bck = 320;

struct query {
	int s, e, id;
};

int N, X[100009], I[100009];
long long ans[100009], sum[100009], mx;
vector<query> L[333];

void add(int x) {
	sum[I[x]] += X[x];
	mx = max(mx, sum[I[x]]);
}

void del(int x) {
	sum[I[x]] -= X[x];
}

int main() {
	vector<int> P;
	int Q; scanf("%d%d", &N, &Q);
	for(int i=1; i<=N; i++) {
		scanf("%d", &X[i]);
		P.push_back(X[i]);
	}
	sort(P.begin(), P.end());
	P.resize(unique(P.begin(), P.end()) - P.begin());
	for(int i=1; i<=N; i++) I[i] = lower_bound(P.begin(), P.end(), X[i]) - P.begin() + 1;
	for(int i=1; i<=Q; i++) {
		int s, e; scanf("%d%d", &s, &e);
		L[s / bck].push_back({s, e, i});
	}
	for(int i=0; i<=N/bck; i++) sort(L[i].begin(), L[i].end(), [&](query PP, query QQ) { return PP.e < QQ.e; });

	for(int i=0; i<=N/bck; i++) {
		mx = 0;
		int ql = i*bck, qr = min((i+1)*bck - 1, N), rm = qr;
		for(auto& it: L[i]) {
			int s = it.s, e = it.e;
			if(s/bck == e/bck) {
				mx = 0;
				for(int i=s; i<=e; i++) add(i);
				ans[it.id] = mx;
				for(int i=s; i<=e; i++) del(i);
				mx = 0;
			}
			else {
				while(rm < e) add(++rm);
				long long tmp = mx;
				for(int i=s; i<=qr; i++) add(i);
				ans[it.id] = mx;
				for(int i=s; i<=qr; i++) del(i);
				mx = tmp;
			}
		}
		for(int i=rm; i>qr; i--) del(i);
	}
	for(int i=1; i<=Q; i++) printf("%lld\n", ans[i]);
	return 0;
}

Compilation message (stderr)

historic.cpp: In function 'int main()':
historic.cpp:41:7: warning: unused variable 'ql' [-Wunused-variable]
   int ql = i*bck, qr = min((i+1)*bck - 1, N), rm = qr;
       ^~
historic.cpp:25:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  int Q; scanf("%d%d", &N, &Q);
         ~~~~~^~~~~~~~~~~~~~~~
historic.cpp:27:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &X[i]);
   ~~~~~^~~~~~~~~~~~~
historic.cpp:34:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int s, e; scanf("%d%d", &s, &e);
             ~~~~~^~~~~~~~~~~~~~~~

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