11655 - Waterland

[@li_kuet]

In case you are wondering for more input :

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1
5 7
1 2
1 3
3 2
3 4
2 5
2 4
4 5

Output :

Code: Select all

Case 1: 15 5

[jddantes]

Why is this WA? Could it be that ull is not enough to contain the answer?

Code: Select all

#include <cstdio>
#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

typedef vector<int> vi;
typedef vector<vi> vii;
typedef unsigned long long ull;

vii adjList;
vector<bool> marked;
vector<ull> nodeCnt;
vector<ull> pathCnt;

int NUM_EDGES;
int NUM_NODES;
ull visit(int i, ull * numNodes){
    //printf("Visiting %d\n", i+1);
    if(marked[i]){
        *numNodes += nodeCnt[i];
        return pathCnt[i];
    }
    if(i == NUM_NODES-1){
        marked[i] = true;
        nodeCnt[i] = 1;
        *numNodes += nodeCnt[i];
        return pathCnt[i] = 1;
    }
    int numAdj = adjList[i].size();
    ull totalPaths = 0;
    ull localNodeCnt = 0;
    if(!i){
        localNodeCnt = 0;
    }
    for(int x = 0; x<numAdj; x++){
        int adj = adjList[i][x];
        totalPaths += visit(adj, &localNodeCnt);
    }
    if(i){
        localNodeCnt += totalPaths;
    }




    marked[i] = true;
    if(totalPaths){ // Valid route, not a route that doesn't reach goal

    } else {
        localNodeCnt = 0; // Else don't count this node
    }
    nodeCnt[i] = localNodeCnt;
    *numNodes += nodeCnt[i];
    return pathCnt[i] = totalPaths;

}

int main(){
    int cases;
    scanf("%d", &cases);

    for(int e = 0; e<cases; e++){
        int numNodes, numEdges;
        scanf("%d %d", &numNodes, &numEdges);
        NUM_EDGES = numEdges;
        NUM_NODES = numNodes;
        adjList.assign(numNodes, vi());
        marked.assign(numNodes, false);
        nodeCnt.assign(numNodes, 0);
        pathCnt.assign(numNodes, 0);

        //printf("Reading input...\n");

        for(int x = 0; x<numEdges; x++){
            int a, b;
            scanf("%d %d", &a,&b);
            a--;
            b--;
            adjList[a].push_back(b);
        }

        ull numTeams = 0; // Number of nodes visited, with repeats
        ull numGroups = 0; // Number of routes/paths
        numGroups = visit(0, &numTeams);

        // Debug
        /*for(int x = 0; x<numNodes; x++){
            if(marked[x]){
                printf("%llu ", nodeCnt[x]);
            } else {
                printf(". ");
            }
        }*/

        printf("Case %d: %llu %llu\n", e+1, numTeams%1000000, numGroups%1000000);

    }


    return 0;
}

[brianfry713]

Yes it looks like your issue is overflow. Try input:

Code: Select all

1
50 1225
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 9
1 10
1 11
1 12
1 13
1 14
1 15
1 16
1 17
1 18
1 19
1 20
1 21
1 22
1 23
1 24
1 25
1 26
1 27
1 28
1 29
1 30
1 31
1 32
1 33
1 34
1 35
1 36
1 37
1 38
1 39
1 40
1 41
1 42
1 43
1 44
1 45
1 46
1 47
1 48
1 49
1 50
2 3
2 4
2 5
2 6
2 7
2 8
2 9
2 10
2 11
2 12
2 13
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2 50
3 4
3 5
3 6
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4 5
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5 6
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12 13
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13 14
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48 50
49 50

AC output:

Code: Select all

Case 1: 66400 10656

You should rewrite your code so that all computations are performed mod 100000

[jddantes]

Got it, thanks.