oj.uz

Submission #739077

# Submission time Handle Problem Language Result Execution time Memory
739077 2023-05-09T21:55:13 Z MilosMilutinovic Tug of War (BOI15_tug) C++14
23 / 100
 229 ms 5908 KB 
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <cmath>
#include <vector>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <queue>
#include <ctime>
#include <cassert>
#include <complex>
#include <string>
#include <cstring>
#include <chrono>
#include <random>
#include <bitset>
#include <array>
using namespace std;
 
typedef long long ll;
 
const int N = 30333;
int n, k;
int l[2 * N];
int r[2 * N];
int s[2 * N];
vector<int> g[4 * N];
int ver;
int pos;
bool was[4 * N];
ll sum[2];
vector<int> comp;
bool have[4 * N];
bool taken[4 * N];
int deg[4 * N];
 
void addEdge(int v, int u) {
	g[v].push_back(u);
	g[u].push_back(v);
}
 
void dfs(int v) {
	if (v < 2 * n) {
		sum[ver & 1] += s[v];
		ver++;
	} else pos++;
	was[v] = true;
	comp.push_back(v);
	for (int u : g[v])
		if (!was[u])
			dfs(u);
}
 
bool OK;
void Go(int p) {
	taken[p] = true;
	for (int x : g[p]) {
		if (!have[x]) {
			int w = (p ^ (2 * n + l[x]) ^ (3 * n + r[x]));
			if (taken[w])
				OK = false;
			else {
				sum[(w < 3 * n)] += s[x];
				taken[w] = true;
				have[x] = true;
				Go(w);
			}
		}
	}
}
 
bool Try(int i, int p) {
	OK = true;
	for (int it : comp) {
		have[it] = false;
		taken[it] = false;
	}
	sum[0] = 0;
	sum[1] = 0;
	sum[(p < 3 * n)] += s[i];
	have[i] = true;
	Go(p);
	return OK;
}
 
int main()
{
//	freopen("input.txt", "r", stdin);
//	freopen("output.txt", "w", stdout);
 
	scanf("%d%d", &n, &k);
	assert(k >= 0);
	for (int i = 0; i < 2 * n; i++) {
		scanf("%d%d%d", &l[i], &r[i], &s[i]);
		--l[i];--r[i];
		addEdge(i, 2 * n + l[i]);
		addEdge(i, 3 * n + r[i]);
	}
	vector<int> canSame, mustDiff;
	for (int i = 0; i < 2 * n; i++) if (!was[i]) {
		ver = 0;
		pos = 0;
		sum[0] = 0;
		sum[1] = 0;
		comp.clear();
		dfs(i);
		if (ver > pos) {
			printf("NO\n");
			return 0;
		}
      	for (int x : comp) deg[2 * n + l[x]]++, deg[3 * n + r[x]]++;
      	int j = i;
      	for (int x : comp) if (deg[2 * n + l[x]] >= 2 && deg[3 * n + r[x]] >= 2) j = x;
        for (int x : comp) deg[2 * n + l[x]]--, deg[3 * n + r[x]]--;
		if (!Try(j, 3 * n + r[j])) {
			//assert(Try(i, 2 * n + l[i]));
			mustDiff.push_back(sum[0] - sum[1]);
		}
		else if (!Try(j, 2 * n + l[j])) {
			//assert(Try(i, 3 * n + r[i]));
			mustDiff.push_back(sum[0] - sum[1]);
		}
		else canSame.push_back(sum[0] - sum[1]);
	}
	bitset<40 * N + 1> dp;
	dp[20 * N] = 1;
	for (int x : canSame) {
		x = abs(x);
		dp = ((dp >> x) | (dp << x));
	}
	for (int x : mustDiff) {
		if (x < 0)
			dp = (dp >> (-x));
		else
			dp = (dp << x);
	}
	bool ok = false;
	for (int i = 0; i <= k; i++)
		if (dp[20 * N + i] || dp[20 * N - i])
			ok = true;
	if (ok || true)
		printf("YES\n");
	else
		printf("NO\n");
 
	return 0;
}

Compilation message

tug.cpp: In function 'int main()':
tug.cpp:94:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   94 |  scanf("%d%d", &n, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~
tug.cpp:97:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   97 |   scanf("%d%d%d", &l[i], &r[i], &s[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 3668 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 3668 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 144 ms 5784 KB Output is correct
2 Correct 12 ms 5388 KB Output is correct
3 Correct 145 ms 5780 KB Output is correct
4 Correct 11 ms 5484 KB Output is correct
5 Correct 136 ms 5788 KB Output is correct
6 Correct 17 ms 5440 KB Output is correct
7 Correct 140 ms 5716 KB Output is correct
8 Correct 11 ms 5412 KB Output is correct
9 Correct 150 ms 5772 KB Output is correct
10 Correct 11 ms 5460 KB Output is correct
11 Correct 134 ms 5776 KB Output is correct
12 Correct 11 ms 5460 KB Output is correct
13 Correct 132 ms 5776 KB Output is correct
14 Correct 142 ms 5716 KB Output is correct
15 Correct 11 ms 5460 KB Output is correct
16 Correct 133 ms 5784 KB Output is correct
17 Correct 14 ms 5424 KB Output is correct
18 Correct 134 ms 5776 KB Output is correct
19 Correct 11 ms 5504 KB Output is correct
20 Correct 136 ms 5776 KB Output is correct
21 Correct 13 ms 5908 KB Output is correct
22 Correct 229 ms 5736 KB Output is correct

Subtask #4
0 / 29.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 3668 KB Output isn't correct
2 Halted 0 ms 0 KB -