답안 #77245 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
77245	2018-09-24T09:39:11 Z	farukkastamonuda	Dynamite (POI11_dyn)	C++14	90 / 100	1970 ms	66500 KB

#include <bits/stdc++.h>
#define li 300005
#define mid (bas+son)/2
using namespace std;
int n,m,ans,A[li],x,y,say;
vector<int> vv[li];
int solve(int node,int ata,int sayi){
    int t=0,v=0;
    for(int i=0;i<(int)vv[node].size();i++){
        int go=vv[node][i];
        if(ata==go) continue;
        int u=solve(go,node,sayi);
        if(u==0) continue;
        if(u>0) v=max(v,u);
        else t=min(t,u);
    }
    if(abs(t)>=sayi){
        ans++;
        return sayi;
    }
    if(t==0 && v==0) return -A[node];
    if(v>abs(t)) return v-1;
    return t-1;
}
int can(int k){
    ans=0;
    if(solve(1,0,k)<0) ans++;
    if(ans<=m) return 1;
    return 0;
}
int main(){
    scanf("%d %d",&n,&m);
    for(int i=1;i<=n;i++) {scanf("%d",&A[i]);say+=A[i];}
    for(int i=1;i<n;i++){
        scanf("%d %d",&x,&y);
        vv[x].push_back(y);
        vv[y].push_back(x);
    }
    if(say<=m){
        printf("0\n");
        return 0;
    }
    int bas=1,son=n-1;
    while(bas<=son){
        if(can(mid)==1) son=mid-1;
        else bas=mid+1;
    }
    printf("%d\n",bas);
    return 0;
}

Compilation message

dyn.cpp: In function 'int main()':
dyn.cpp:32:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&n,&m);
     ~~~~~^~~~~~~~~~~~~~~
dyn.cpp:33:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i=1;i<=n;i++) {scanf("%d",&A[i]);say+=A[i];}
                            ~~~~~^~~~~~~~~~~~
dyn.cpp:35:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d",&x,&y);
         ~~~~~^~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	9 ms	7288 KB	Output is correct
2	Correct	8 ms	7544 KB	Output is correct
3	Correct	8 ms	7596 KB	Output is correct
4	Correct	8 ms	7596 KB	Output is correct

Subtask #2
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	8 ms	7596 KB	Output is correct
2	Correct	8 ms	7596 KB	Output is correct
3	Correct	8 ms	7596 KB	Output is correct

Subtask #3
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	8 ms	7652 KB	Output is correct
2	Correct	8 ms	7692 KB	Output is correct

Subtask #4
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	9 ms	7700 KB	Output is correct
2	Correct	8 ms	7736 KB	Output is correct

Subtask #5
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	17 ms	8276 KB	Output is correct
2	Correct	45 ms	8988 KB	Output is correct
3	Correct	43 ms	9608 KB	Output is correct
4	Correct	56 ms	11680 KB	Output is correct

Subtask #6
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	62 ms	11680 KB	Output is correct
2	Correct	106 ms	12740 KB	Output is correct
3	Correct	168 ms	13908 KB	Output is correct
4	Correct	144 ms	17824 KB	Output is correct

Subtask #7
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	149 ms	17824 KB	Output is correct
2	Correct	156 ms	17824 KB	Output is correct
3	Correct	309 ms	18336 KB	Output is correct
4	Correct	306 ms	25028 KB	Output is correct

Subtask #8
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	691 ms	25028 KB	Output is correct
2	Correct	758 ms	28612 KB	Output is correct
3	Correct	1426 ms	39812 KB	Output is correct
4	Correct	1408 ms	43364 KB	Output is correct

Subtask #9
10.0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1970 ms	43364 KB	Output is correct
2	Correct	1334 ms	43364 KB	Output is correct
3	Correct	1882 ms	52176 KB	Output is correct

Subtask #10
0 / 10.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1636 ms	55876 KB	Output is correct
2	Correct	1291 ms	55876 KB	Output is correct
3	Runtime error	1913 ms	66500 KB	Memory limit exceeded: We have a known bug that the memory usage is measured incorrectly (possibly because of Meltdown/Spectre patch), so your solution may be correct. Please submit again. Sorry for the inconvenience.
4	Halted	0 ms	0 KB	-