Submission #125497

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
125497	2019-07-05 13:41:10	choikiwon	Railway Trip (JOI17_railway_trip)	C++17	100 / 100	287 ms	19284 KiB

railway_trip

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#include<bits/stdc++.h>
using namespace std;
typedef pair<int, int> pii;
const int MN = 100010;
int N, K, Q;
int L[MN];
int le[20][MN], ri[20][MN];
int main() {
    scanf("%d %d %d", &N, &K, &Q);
    for(int i = 0; i < N; i++) {
        scanf("%d", &L[i]);
        L[i]--;
    }
    stack<pii> stk;
    for(int i = 0; i < N; i++) {
        while(!stk.empty() && stk.top().first < L[i]) stk.pop();
        if(!stk.empty()) le[0][i] = stk.top().second;
        stk.push(pii(L[i], i));
    }
    while(!stk.empty()) stk.pop();
    for(int i = N - 1; i >= 0; i--) {
        while(!stk.empty() && stk.top().first < L[i]) stk.pop();
        if(!stk.empty()) ri[0][i] = stk.top().second;
 
 
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Compilation message (stderr)

railway_trip.cpp: In function 'int main()':
railway_trip.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d %d", &N, &K, &Q);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
railway_trip.cpp:16:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &L[i]);
         ~~~~~^~~~~~~~~~~~~
railway_trip.cpp:47:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         int a, b; scanf("%d %d", &a, &b);
                   ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 25 / 25
• Subtask 4: 55 / 55