Compilare: user.cpp: In function ‘int solve(int, int)’: user.cpp:29:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < M[sursa][0].size(); i++) ^ user.cpp:31:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < M[sursa][1].size(); i++) ^ user.cpp: In function ‘void Read()’: user.cpp:16:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("northrend.in","r",stdin); ^ user.cpp:17:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &sursa); ^ user.cpp:19:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &x, &y, &z); ^ user.cpp: In function ‘int main()’: user.cpp:45:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("northrend.out","w", stdout); ^