Compilare: user.cpp: In function ‘int main()’: user.cpp:34:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < graph[x].size(); ++ i) ^ user.cpp:14:24: warning: unused variable ‘j’ [-Wunused-variable] int n, m, x, y, i, j, c, sp; ^ user.cpp:14:27: warning: unused variable ‘c’ [-Wunused-variable] int n, m, x, y, i, j, c, sp; ^ user.cpp:12:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reinvent.in", "r", stdin); ^ user.cpp:13:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("reinvent.out", "w", stdout); ^ user.cpp:17:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &m, &sp); ^ user.cpp:19:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp:25:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^