Compilare: main.cpp: In function 'void DFS(int, int)': main.cpp:49:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (pathSums[index].empty() || pos > pathSums[index].size()) { ~~~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:60:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (!pathSums[index].empty() && pos < pathSums[index].size()) { ~~~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:71:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (!pathSums[index].empty() && pos < pathSums[index].size()) { ~~~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:81:18: warning: unused variable 'len' [-Wunused-variable] int n, x, y, len; ^~~ main.cpp:84:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &n, &sum); ^ main.cpp:87:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &x, &y); ^