Compilare: user.cpp: In function ‘int main()’: user.cpp:57:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &n, &m, &lim); ^ user.cpp:59:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &x, &y, &z, &t); ^ user.cpp:52:9: warning: ‘cost’ may be used uninitialized in this function [-Wmaybe-uninitialized] int cost, flux, min, lim, m, x, y, z, t, i; ^