oj.uz

Submission #127124

# Submission time Handle Problem Language Result Execution time Memory
127124 2019-07-09T00:02:16 Z wilwxk Designated Cities (JOI19_designated_cities) C++14
7 / 100
 411 ms 51520 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

const int MAXN=2e5+5;
vector<tuple<int, ll, ll> > g[MAXN];
pair<ll, int> mprof[MAXN][2];
ll dp[MAXN];
ll respf[MAXN], somaf;
int n, q;

void melhora(int cur, pair<int, int> val) {
	if(val.first>=mprof[cur][0].first) {
		mprof[cur][1]=mprof[cur][0];
		mprof[cur][0]=val;
	}
	else if(val.first>mprof[cur][1].first) {
		mprof[cur][1]=val;
	}
}

void predfs(int cur, int p) {
	for(auto aresta : g[cur]) {
		int viz; ll peso, rpeso;
		tie(viz, peso, rpeso)=aresta;
		if(viz==p) continue;
		predfs(viz, cur);

		dp[cur]+=dp[viz]+rpeso;
		melhora(cur, {mprof[viz][0].first+peso, viz});
	}
}

void dfs(int cur, int p) {
	respf[1]=max(respf[1], dp[cur]);
	respf[2]=max(respf[2], dp[cur]+mprof[cur][0].first);
	// printf("dp[%d]= %lld // mprof[cur][0]= %lld, %d\n", cur, dp[cur], mprof[cur][0].first, mprof[cur][0].second);
	for(auto aresta : g[cur]) {
		int viz; ll peso, rpeso;
		tie(viz, peso, rpeso)=aresta;
		if(viz==p) continue;

		ll dpc=dp[cur], dpv=dp[viz];
		auto mprofc0=mprof[cur][0], mprofc1=mprof[cur][1];
		auto mprofv0=mprof[viz][0], mprofv1=mprof[viz][1];

		dp[cur]-=(dp[viz]+rpeso);
		dp[viz]+=(dp[cur]+peso);
		if(mprof[cur][0].second==viz) mprof[cur][0]=mprof[cur][1];
		melhora(viz, {mprof[cur][0].first+rpeso, cur});

		dfs(viz, cur);

		dp[cur]=dpc;
		dp[viz]=dpv;
		mprof[cur][0]=mprofc0; mprof[cur][1]=mprofc1;
		mprof[viz][0]=mprofv0; mprof[viz][1]=mprofv1;
	}
}

int main() {
	scanf("%d", &n);
	for(int i=1; i<n; i++) {
		int a, b, c, d; scanf("%d %d %d %d", &a, &b, &c, &d);
		g[a].push_back({b, c, d}); g[b].push_back({a, d, c});
		somaf+=c; somaf+=d;
	}

	predfs(1, 1);
	dfs(1, 1);

	scanf("%d", &q);
	while(q--) {
		int val; scanf("%d", &val);
		printf("%lld\n", somaf-respf[val]);
	}
}

Compilation message

designated_cities.cpp: In function 'int main()':
designated_cities.cpp:62:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
designated_cities.cpp:64:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int a, b, c, d; scanf("%d %d %d %d", &a, &b, &c, &d);
                   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
designated_cities.cpp:72:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &q);
  ~~~~~^~~~~~~~~~
designated_cities.cpp:74:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int val; scanf("%d", &val);
            ~~~~~^~~~~~~~~~~~

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5112 KB Output is correct
2 Incorrect 6 ms 5116 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5112 KB Output is correct
2 Correct 334 ms 27888 KB Output is correct
3 Correct 405 ms 50808 KB Output is correct
4 Correct 309 ms 27896 KB Output is correct
5 Correct 323 ms 27560 KB Output is correct
6 Correct 328 ms 31200 KB Output is correct
7 Correct 278 ms 26660 KB Output is correct
8 Correct 411 ms 51520 KB Output is correct
9 Correct 224 ms 25752 KB Output is correct

Subtask #3
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 4984 KB Output is correct
2 Incorrect 391 ms 32504 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5112 KB Output is correct
2 Incorrect 6 ms 5116 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5112 KB Output is correct
2 Correct 334 ms 27888 KB Output is correct
3 Correct 405 ms 50808 KB Output is correct
4 Correct 309 ms 27896 KB Output is correct
5 Correct 323 ms 27560 KB Output is correct
6 Correct 328 ms 31200 KB Output is correct
7 Correct 278 ms 26660 KB Output is correct
8 Correct 411 ms 51520 KB Output is correct
9 Correct 224 ms 25752 KB Output is correct
10 Correct 6 ms 4984 KB Output is correct
11 Incorrect 391 ms 32504 KB Output isn't correct
12 Halted 0 ms 0 KB -

Subtask #6
0 / 44.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5112 KB Output is correct
2 Incorrect 6 ms 5116 KB Output isn't correct
3 Halted 0 ms 0 KB -