Compilare: user.cpp: In function ‘void bellman_ford(int)’: user.cpp:35:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < a[k].size(); ++j) ^ user.cpp: In function ‘void bfs(int)’: user.cpp:67:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < b[k].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:121:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < b[i].size(); ++j) ^ user.cpp:83:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algoritm.in", "r", stdin); ^ user.cpp:84:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algoritm.out", "w", stdout); ^ user.cpp:85:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &cs); ^ user.cpp:88:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:92:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &c); ^