Submission #1836699
Source Code Expand
#include <bits/stdc++.h> using namespace std; #define FOR(i,a,b) for(int i = (a); i < (b); i++) #define RFOR(i,b,a) for(int i = (b) - 1; i >= (a); i--) #define ITER(it, a) for(typeof(a.begin()) it = a.begin(); it != a.end(); it++) #define FILL(a, value) memset(a, value, sizeof(a)) #define SZ(a) (int) a.size() #define ALL(a) a.begin(),a.end() #define PB push_back #define MP make_pair typedef long long LL; typedef vector<int> VI; typedef pair<int, int> PII; const double PI = acos(-1.0); const LL INF = 1000 * 1000 * 1000 + 7; const LL LINF = INF * (LL)INF; const int MAX = 100100; VI g[MAX]; LL A[MAX]; LL dfs(int x, int p) { LL rest = A[x]; FOR (i, 0, SZ(g[x])) { int to = g[x][i]; if (to == p) continue; LL v = dfs(to, x); if (v < 0) return -1; if (SZ(g[x]) != 1) { if (v * 2 > A[x]) return -1; } rest -= v; } if (SZ(g[x]) != 1) { if (rest * 2 > A[x]) return -1; } return rest; } int main() { //freopen("in.txt", "r", stdin); //ios::sync_with_stdio(false); cin.tie(0); int n; scanf("%d", &n); FOR (i, 0, n) { int x; scanf("%d", &x); A[i] = x; } FOR (i, 0, n-1) { int x, y; scanf("%d%d", &x, &y); x--; y--; g[x].PB(y); g[y].PB(x); } FOR (i, 0, n) { if (SZ(g[i]) > 1) A[i] *= 2; } if (dfs(0, -1) != 0) { cout<<"NO"<<endl; } else { cout<<"YES"<<endl; } }
Submission Info
Submission Time | |
---|---|
Task | C - Cleaning |
User | vjudge4 |
Language | C++14 (GCC 5.4.1) |
Score | 700 |
Code Size | 1348 Byte |
Status | AC |
Exec Time | 52 ms |
Memory | 13184 KB |
Compile Error
./Main.cpp: In function ‘int main()’: ./Main.cpp:59:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ ./Main.cpp:63:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ ./Main.cpp:70:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 700 / 700 | ||||
Status |
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Set Name | Test Cases |
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Sample | sample1.txt, sample2.txt, sample3.txt |
All | sample1.txt, sample2.txt, sample3.txt, in1.txt, in10.txt, in11.txt, in12.txt, in13.txt, in14.txt, in15.txt, in16.txt, in17.txt, in18.txt, in19.txt, in2.txt, in20.txt, in21.txt, in22.txt, in23.txt, in24.txt, in25.txt, in26.txt, in27.txt, in28.txt, in29.txt, in3.txt, in30.txt, in31.txt, in32.txt, in33.txt, in34.txt, in35.txt, in36.txt, in37.txt, in38.txt, in39.txt, in4.txt, in40.txt, in41.txt, in42.txt, in43.txt, in44.txt, in45.txt, in5.txt, in6.txt, in7.txt, in8.txt, in9.txt, sample1.txt, sample2.txt, sample3.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
in1.txt | AC | 49 ms | 6656 KB |
in10.txt | AC | 52 ms | 6656 KB |
in11.txt | AC | 52 ms | 11904 KB |
in12.txt | AC | 52 ms | 11904 KB |
in13.txt | AC | 49 ms | 13184 KB |
in14.txt | AC | 49 ms | 12288 KB |
in15.txt | AC | 2 ms | 2560 KB |
in16.txt | AC | 2 ms | 2560 KB |
in17.txt | AC | 2 ms | 2560 KB |
in18.txt | AC | 2 ms | 2560 KB |
in19.txt | AC | 46 ms | 6656 KB |
in2.txt | AC | 48 ms | 6656 KB |
in20.txt | AC | 45 ms | 6656 KB |
in21.txt | AC | 44 ms | 6656 KB |
in22.txt | AC | 45 ms | 6656 KB |
in23.txt | AC | 48 ms | 6656 KB |
in24.txt | AC | 48 ms | 6656 KB |
in25.txt | AC | 2 ms | 2560 KB |
in26.txt | AC | 46 ms | 6656 KB |
in27.txt | AC | 46 ms | 6656 KB |
in28.txt | AC | 2 ms | 2560 KB |
in29.txt | AC | 42 ms | 6656 KB |
in3.txt | AC | 48 ms | 6656 KB |
in30.txt | AC | 2 ms | 2560 KB |
in31.txt | AC | 47 ms | 6656 KB |
in32.txt | AC | 45 ms | 6656 KB |
in33.txt | AC | 48 ms | 6656 KB |
in34.txt | AC | 49 ms | 6656 KB |
in35.txt | AC | 48 ms | 6656 KB |
in36.txt | AC | 49 ms | 6656 KB |
in37.txt | AC | 3 ms | 2688 KB |
in38.txt | AC | 46 ms | 6656 KB |
in39.txt | AC | 48 ms | 6656 KB |
in4.txt | AC | 50 ms | 6656 KB |
in40.txt | AC | 46 ms | 6656 KB |
in41.txt | AC | 47 ms | 6656 KB |
in42.txt | AC | 48 ms | 6656 KB |
in43.txt | AC | 48 ms | 6656 KB |
in44.txt | AC | 48 ms | 6656 KB |
in45.txt | AC | 49 ms | 6656 KB |
in5.txt | AC | 50 ms | 6656 KB |
in6.txt | AC | 49 ms | 6656 KB |
in7.txt | AC | 43 ms | 6144 KB |
in8.txt | AC | 12 ms | 3584 KB |
in9.txt | AC | 48 ms | 6656 KB |
sample1.txt | AC | 2 ms | 2560 KB |
sample2.txt | AC | 2 ms | 2560 KB |
sample3.txt | AC | 2 ms | 2560 KB |