Submission #128174

#	Time	Username	Problem	Language	Result	Execution time	Memory
128174		dndhk	Minerals (JOI19_minerals)	C++14	40 / 100	18 ms	1912 KiB

minerals

#include "minerals.h"
#include <bits/stdc++.h>

#define pb push_back
#define all(v) ((v).begin(), (v).end())
#define sortv(v) sort(all(v))
#define sz(v) ((int)(v).size())
#define uniqv(v) (v).erase(unique(all(v)), (v).end())
#define umax(a, b) (a)=max((a), (b))
#define umin(a, b) (a)=min((a), (b))
#define FOR(i,a,b) for(int i = (a); i <= (b); i++)
#define rep(i,n) FOR(i,1,n)
#define rep0(i,n) FOR(i,0,(int)(n)-1)
#define FI first
#define SE second
#define INF 2000000000
#define INFLL 1000000000000000000LL


using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAX_N = 43000;

int idx[MAX_N*2+1];
vector<pii> ans;

bool chk[MAX_N+1];

vector<int> vt1, vt2;

void solve(int x, int y){
	/*printf("%d %d\n", x, y);
	for(int i=x; i<=y; i++){
		printf("%d ", idx[i]);
		if(i==(x+y)/2){
			printf("\n");
		}
	}
	printf("\n");*/
	if(y==x+1){
		ans.pb({idx[x], idx[y]});
		if(chk[x]){
			Query(idx[x]); Query(idx[y]);
		}
		return;
	}
	int l = (y-x+1)/2;
	int m = l/2;
	int i;
	if(chk[x]){
		int prv;
		i = x+l-1;
		while(m>0){
			prv = Query(idx[i]);
			i--; m--;
		}
		for(int j = y; j >= x+l; j--){
			int now = Query(idx[j]);
			if(now==prv){
				Query(idx[j]);
				vt1.push_back(idx[j]);
			}else{
				vt2.push_back(idx[j]);
			}
			prv = now;
		}
	}else{
		int prv;
		i = x;
		while(m>0){
			prv =  Query(idx[i]);
			chk[i] = true;
			m--; i++;
		}
		i--;
		for(int j=x+l; j<=y; j++){
			int now = Query(idx[j]);
			if(now==prv){
				vt1.push_back(idx[j]);
			}else{
				Query(idx[j]);
				vt2.push_back(idx[j]);
			}
		}
	}
	int i3 = i;
	int i2 = i+l;
	i = x+l-1;
	while(i>i3){
		chk[i2] = false;
		idx[i2] = idx[i];
		i--; i2--;
	}
	i2 = i + l+1;
	i = i3+1;
	while(!vt1.empty()){
		chk[i] = true;
		idx[i] = vt1.back(); vt1.pop_back(); i++;
	}
	while(!vt2.empty()){
		chk[i2] = false;
		idx[i2] = vt2.back(); vt2.pop_back(); i2++;
	}
	solve(x, i3*2 - x + 1); solve(i3*2 - x + 2, y);
}

void Solve(int N) {
	int prv = 0;
	int i1 = 1, i2 = N+1;
	for(int i=1; i<=N*2; i++){
		int now = Query(i);
		if(now==prv){
			idx[i2++] = i;
		}else{
			idx[i1++] = i;
		}
		prv = now;
	}
	for(int i=1; i<=N*2; i++)	Query(i);
	solve(1, N*2);
	for(int i=0; i<ans.size(); i++){
		Answer(ans[i].first, ans[i].second);
	}
}

Compilation message (stderr)

minerals.cpp: In function 'void Solve(int)':
minerals.cpp:124:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0; i<ans.size(); i++){
               ~^~~~~~~~~~~
minerals.cpp: In function 'void solve(int, int)':
minerals.cpp:81:4: warning: 'prv' may be used uninitialized in this function [-Wmaybe-uninitialized]
    if(now==prv){
    ^~
minerals.cpp:62:4: warning: 'prv' may be used uninitialized in this function [-Wmaybe-uninitialized]
    if(now==prv){
    ^~

• Subtask 1: 6 / 6
• Subtask 2: 25 / 25
• Subtask 3: 9 / 9
• Subtask 4: 0 / 30
• Subtask 5: 0 / 5
• Subtask 6: 0 / 5
• Subtask 7: 0 / 5
• Subtask 8: 0 / 5
• Subtask 9: 0 / 10