Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:108:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < stations[i].size(); ++ j) ^ user.cpp:109:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = j + 1; k < stations[i].size(); ++ k) { ^ user.cpp:117:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < stations[i].size(); ++ k) ^ user.cpp:118:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int l = 0; l < stations[j].size(); ++ l) { ^ user.cpp:140:66: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int z = 0; z < stations[i].size(); ++ z) { ^ user.cpp:150:66: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int z = 0; z < stations[z].size(); ++ z) { ^ user.cpp:203:9: error: ‘ans3’ was not declared in this scope ans3 = min(ans3, dp3[(1 << N) - 1][i]); ^ user.cpp:204:9: error: ‘ans3’ was not declared in this scope if (ans3 >= INF) ^