Submission #123927

#	Time	Username	Problem	Language	Result	Execution time	Memory
123927		AyaBenSaad	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	22 / 100	276 ms	238712 KiB

skyscraper

#include <bits/stdc++.h>
 
using namespace std;
 
const int N = 2e3 + 3; //number of skyscrapers
const int M = 3e4 + 4; //number of doges;
const int inf = 1e9;
int n, m, b[M], p[M], ok;
vector <int> dgin[N];
int dp[M][N];
 
int solve (int doge, int sk) {
    if (doge == 1) {ok = 1; return 0;}
    if (sk < 0 || sk >= n) return inf;
    int &ret = dp[doge][sk];
    if (ret != -1) return ret;
    ret = solve(doge, sk+p[doge]) + 1;
    ret = min(ret, solve(doge, sk-p[doge]) + 1);
    for (int i : dgin[sk]) {
        if (i != doge) ret = min (ret, min(solve(i, sk-p[i])+1, solve(i, sk+p[i])+1));
    }
    return ret;
}
 
int main () {
    scanf ("%d %d", &n, &m);
    for (int i = 0; i < m; i++) {
        scanf("%d %d", &b[i], &p[i]);
        dgin[b[i]].push_back (i);
    }
    memset (dp, -1, sizeof dp);
    int x = solve(0, b[0]);
    if(ok) printf("%d\n", x-1);
    else puts("-1");
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:26:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf ("%d %d", &n, &m);
     ~~~~~~^~~~~~~~~~~~~~~~~
skyscraper.cpp:28:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &b[i], &p[i]);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43