Submission #2035

#	Time	Username	Problem	Language	Result	Execution time	Memory
2035		kriii	Jousting tournament (IOI12_tournament)	C++98	100 / 100	65 ms	5128 KiB

tournament

const int Z = 1 << 17;
int next[Z],cnt[Z*2];

int getnth(int n)
{
	int x = 1;

	while (x < Z){
		x <<= 1;
		if (cnt[x] < n) n -= cnt[x++];
	}

	return x - Z;
}

void up(int x, int p)
{
	x += Z;
	while (x){
		cnt[x] += p;
		x >>= 1;
	}
}

int maxtree[Z*2],res[Z];
int max(int a, int b){return a > b ? a : b;}

int GetBestPosition(int N, int C, int R, int *K, int *S, int *E) {
	int i,peo,x,y,r;

	for (i=0;i<N;i++) next[i] = i+1, cnt[i+Z] = 1;
	for (i=Z-1;i>=1;i--) cnt[i] = cnt[i*2] + cnt[i*2+1];

	for (i=0;i<C;i++){
		peo = E[i] - S[i] + 1;
		S[i] = x = getnth(S[i]+1);
		up(x,1);
		while (peo--){
			up(x,-1);
			x = next[x];
		}
		E[i] = x - 1;
		next[S[i]] = x;
	}

	for (i=0;i<N-1;i++) maxtree[i+Z] = K[i];
	for (i=Z-1;i>=1;i--) maxtree[i] = max(maxtree[i*2],maxtree[i*2+1]);

	for (i=0;i<C;i++){
		x = S[i] + Z; y = E[i] - 1 + Z; r = 0;
		while (x < y){
			if (x & 1) r = max(r,maxtree[x++]);
			if (~y & 1) r = max(r,maxtree[y--]);
			x >>= 1; y >>= 1;
		} if (x == y) r = max(r,maxtree[x]);
		if (r < R){
			res[S[i]]++;
			res[E[i]]--;
		}
	}

	int s = 0, p = -1, ind;
	for (i=0;i<N;i++){
		s += res[i];
		if (p < s){
			p = s; ind = i;
		}
	}

	return ind;
}

• Subtask 1: 17 / 17
• Subtask 2: 32 / 32
• Subtask 3: 51 / 51