Sicily 2013. Pay Back

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一个欠债还钱、借债讨钱的问题，贪心算法解决。
沿着路一直走下去，把别人欠的钱都拿回，把能还的钱还了。当手头上的钱不够还时，记下当前编号。然后往后走，只收钱不还钱，等到收到的钱能够一次还清前面所欠的钱的总和时，往回走，边走边还钱，还完钱再往前走。如此反复，直到终点即可。另外要注意统计走过的路程。

Run Time: 0.03sec
Run Memory: 304KB
Code length: 769Bytes
Submit Time: 2011-12-08 00:39:23

// Problem#: 2013// Submission#: 1049990// The source code is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License// URI: http://creativecommons.org/licenses/by-nc-sa/3.0/// All Copyright reserved by Informatic Lab of Sun Yat-sen University#include <cstdio>using namespace std;int main(){    int N, i;    int money, keep;    int dist = 0, total = 0, lend = 0;    bool unable = false;    scanf( "%d", &N );    for ( i = 0; i < N; i++ ) {        scanf( "%d", &money );        if ( money > 0 ) {            total += money;            if ( unable && total >= -lend ) {                total += lend;                lend = 0;                unable = false;                dist += ( i - keep ) * 2;            }        }        else if ( unable )            lend += money;        else if ( -money <= total )            total += money;        else {            unable = true;            keep = i;            lend += money;        }    }    printf( "%d\n", dist + N );    return 0;}