Compilare: user.cpp: In function ‘void solve()’: user.cpp:95:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int it = 0; it < v[i].size() - 1; ++it) ^ user.cpp: In function ‘void input()’: user.cpp:20:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:22:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int nr; scanf("%d", &nr); ^ user.cpp:24:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int x; scanf("%d", &x); ^ user.cpp: In function ‘void solve()’: user.cpp:86:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &t); y = to[x][y-1]; ^ user.cpp: In function ‘int main()’: user.cpp:107:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sushi2.in","r",stdin); ^ user.cpp:108:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sushi2.out","w",stdout); ^