Submission #479933

#	Time	Username	Problem	Language	Result	Execution time	Memory
479933		glome	Mutating DNA (IOI21_dna)	C++17	56 / 100	115 ms	16768 KiB

dna

#include "dna.h"

#include<bits/stdc++.h>

using namespace std;

vector<vector<int>> pref1(1e5, vector<int> (3, 0)), pref2(1e5, vector<int> (3, 0));
vector<int> sum(1e5, 0);

int n;

struct seg {
	vector<int> t = vector<int> (1e5 * 4);
	void build(int x, int l, int r) {
		if(l == r) {
			t[x] = sum[l];
			return;
		}
		int m = (l + r) / 2;
		build(2 * x, l, m);
		build(2 * x + 1, m + 1, r);
		t[x] = t[2 * x] + t[2 * x + 1];
	}
	void build() {
		build(1, 0, n - 1);
	}
	int ans(int x, int lx, int rx, int l, int r) {
		if(lx >= l && rx <= r) {
			return t[x];
		}
		if(lx > r || rx < l) {
			return 0;
		}
		int m = (lx + rx) / 2;
		return ans(2 * x, lx, m, l, r) + ans(2 * x + 1, m + 1, rx, l, r);
	}
	int ans(int l, int r) {
		return ans(1, 0, n - 1, l, r);
	}
};	

seg st;

void init(std::string a, std::string b) {
	n = a.size();;
	for (int i = 0; i<a.size(); i++) {
		pref1[i][0] = pref1[max(i-1, 0)][0];
		pref1[i][1] = pref1[max(i-1, 0)][1];
		pref1[i][2] = pref1[max(i-1, 0)][2];

		pref2[i][0] = pref2[max(i-1, 0)][0];
		pref2[i][1] = pref2[max(i-1, 0)][1];
		pref2[i][2] = pref2[max(i-1, 0)][2];

		if(a[i] == 'A') {
			pref1[i][0] += 1;
		}
		if(a[i] == 'T') {
			pref1[i][1] += 1;
		}
		if(a[i] == 'C') {
			pref1[i][2] += 1;
		}

		if(b[i] == 'A') {
			pref2[i][0] += 1;
		}
		if(b[i] == 'T') {
			pref2[i][1] += 1;
		}
		if(b[i] == 'C') {
			pref2[i][2] += 1;
		}
		if(a[i] != b[i]) {
			sum[i]++;
		}
	}
	st.build();
}

int get_distance(int x, int y) {
	if(pref1[y][0] - (x - 1 < 0 ? 0 : pref1[max(x-1, 0)][0]) != pref2[y][0] - (x - 1 < 0 ? 0 : pref2[max(x-1, 0)][0]) || pref1[y][1] - (x - 1 < 0 ? 0 : pref1[max(x-1, 0)][1]) != pref2[y][1] - (x - 1 < 0 ? 0 : pref2[max(x-1, 0)][1]) || pref1[y][2] - (x - 1 < 0 ? 0 : pref1[max(x-1, 0)][2]) != pref2[y][2] - (x - 1 < 0 ? 0 : pref2[max(x-1, 0)][2])) {
		return -1;
	}
	int k = st.ans(x, y);
	return (k & 1 ? k / 2 + 1 : k / 2);

}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:46:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |  for (int i = 0; i<a.size(); i++) {
      |                  ~^~~~~~~~~

• Subtask 1: 21 / 21
• Subtask 2: 22 / 22
• Subtask 3: 13 / 13
• Subtask 4: 0 / 28
• Subtask 5: 0 / 16