Check out example codes for "bellman ford algorithm cp algorithm". It will help you in understanding the concepts better.

Code Example 1

struct edge
    int a, b, cost;

int n, m, v;
vector<edge> e;
const int INF = 1000000000;

void solve()
    vector<int> d (n, INF);
    d[v] = 0;
    for (int i=0; i<n-1; ++i)
        for (int j=0; j<m; ++j)
            if (d[e[j].a] < INF)
                d[e[j].b] = min (d[e[j].b], d[e[j].a] + e[j].cost);
    // display d, for example, on the screen

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