Compilare: main.cpp: In function 'void bellman_ford(int)': main.cpp:62:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < edges[node].size(); i++){ ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:95:29: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] if(((1 << i - 1) & l) && dp[l][i] != (1 << 28)) ~~^~~ main.cpp:96:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < mch[i].size(); j++){ ~~^~~~~~~~~~~~~~~ main.cpp:98:42: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] dp[l + (1 << e.x - 1)][e.x] = min(dp[l + (1 << e.x - 1)][e.x], dp[l][i] + e.cost); ~~~~^~~ main.cpp:98:76: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] dp[l + (1 << e.x - 1)][e.x] = min(dp[l + (1 << e.x - 1)][e.x], dp[l][i] + e.cost); ~~~~^~~ main.cpp: In function 'void Read(int&)': main.cpp:30:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^ main.cpp:35:42: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(f, MAX, 1, IN), pos = 0; ^ main.cpp: In function 'int main()': main.cpp:76:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ubuntzei.out", "w", stdout); ^