Compilare: user.cpp: In function ‘void bellman_ford()’: user.cpp:40:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i<arcs[curr_node].size(); ++i) ~^~~~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘bool dijkstra()’: user.cpp:81:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<arcs[curr_node].size(); ++i) ~^~~~~~~~~~~~~~~~~~~~~~~ user.cpp:64:53: warning: unused variable ‘d_old’ [-Wunused-variable] int d_working[n+2], d_final[n+2], parents[n+2], d_old[n+2]; ^~~~~ user.cpp: In function ‘int main()’: user.cpp:127:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.in", "r", stdin); ^ user.cpp:128:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.out", "w", stdout); ^ user.cpp:131:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &n, &m, &source, &dest); ^ user.cpp:135:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp:139:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &caps[x][y], &costs[x][y]); ^