func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m;   int f[50][50], mn[50], mx[50];   const int INF = 1e9;   int gm, gg, sm, ss;   long long d[51][51] = {}, nd[51][51];   bool cang[50], cans[50], canb[50];   int main() {     scanf( %d%d , &n, &m);     for (int i = 0; i < (int)(n); ++i)       for (int j = 0; j < (int)(n); ++j) f[i][j] = INF;     for (int i = 0; i < (int)(n); ++i) f[i][i] = 0;     for (int i = 0; i < (int)(m); ++i) {       int from, to, w;       scanf( %d%d%d , &from, &to, &w), --from, --to;       f[from][to] = min(f[from][to], w);       f[to][from] = min(f[to][from], w);     }     scanf( %d%d%d%d , &gm, &gg, &sm, &ss);     for (int k = 0; k < (int)(n); ++k)       for (int i = 0; i < (int)(n); ++i)         for (int j = 0; j < (int)(n); ++j) {           f[i][j] = min(f[i][j], f[i][k] + f[k][j]);         }     for (int i = 0; i < (int)(n); ++i) {       mn[i] = INF, mx[i] = -INF;       for (int j = 0; j < (int)(n); ++j)         if (i != j) {           mn[i] = min(mn[i], f[i][j]);           mx[i] = max(mx[i], f[i][j]);         }     }     long long ans = 0;     for (int gco = 0; gco < (int)(n); ++gco)       for (int bco = 0; bco < (int)(n); ++bco)         if (mn[gco] < mx[bco] || (mn[gco] == mx[bco] && gco < bco)) {           if (gco == bco) continue;           bool ok = true;           for (int i = 0; i < (int)(n); ++i) {             if (i == gco) {               cang[i] = true;               cans[i] = canb[i] = false;             } else if (i == bco) {               canb[i] = true;               cang[i] = cans[i] = false;             } else {               cang[i] = mn[i] < mn[gco] || (mn[i] == mn[gco] && i < gco);               canb[i] = mx[i] > mx[bco] || (mx[i] == mx[bco] && i > bco);               cans[i] = false;               for (int j = 0; j < (int)(n); ++j)                 if (j != i &&                     (f[i][j] > mn[gco] || (f[i][j] == mn[gco] && i > gco)) &&                     (f[i][j] < mx[bco] || (f[i][j] == mx[bco] && i < bco))) {                   cans[i] = true;                   break;                 }               if (!cang[i] && !cans[i] && !canb[i]) {                 ok = false;                 break;               }             }           }           if (!ok) continue;           memset(d, 0, sizeof d);           d[0][0] = 1;           for (int i = 0; i < (int)(n); ++i) {             memset(nd, 0, sizeof nd);             for (int g = 0; g < (int)(gg + 1); ++g)               for (int s = 0; s < (int)(ss + 1); ++s)                 if (d[g][s] != 0) {                   if (cang[i]) {                     nd[g + 1][s] += d[g][s];                   }                   if (cans[i]) {                     nd[g][s + 1] += d[g][s];                   }                   if (canb[i]) {                     nd[g][s] += d[g][s];                   }                 }             memcpy(d, nd, sizeof nd);           }           for (int g = gm; g <= gg; ++g)             for (int s = sm; s <= ss; ++s) {               ans += d[g][s];             }           d[gg][ss] -= ans;         }     cout << ans << endl;     return 0;   }   