Compilare: main.cpp: In function 'void Decompose()': main.cpp:198:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j < Graph[i].size(); ++j) ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void BuildSegmentTrees()': main.cpp:210:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < paths.size(); ++i) ~~^~~~~~~~~~~~~~ main.cpp: In function 'void ReadData()': main.cpp:143:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ main.cpp:154:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &value[i]); ^ main.cpp:157:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ main.cpp: In function 'void Solve()': main.cpp:218:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &op, &x, &y); ^ main.cpp: In member function 'bool SegmentTree2::Update_(int, int, int, int&, int&)': main.cpp:52:3: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:245:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("heavypath.in", "r", stdin); ^ main.cpp:246:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("heavypath.out", "w", stdout); ^