Compilare: user.cpp: In function ‘void PathDecomposition()’: user.cpp:88:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < Chain[i].size(); ++ j) ^ user.cpp: In function ‘int main()’: user.cpp:128:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arb4.in", "r", stdin); ^ user.cpp:129:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arb4.out", "w", stdout); ^ user.cpp:131:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i", &N, &M); ^ user.cpp:135:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i %i", &X, &Y, &Z); ^ user.cpp:149:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i %i %i", &X, &Y, &Z); ^