Compilare: user.cpp: In function ‘int main()’: user.cpp:53:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("provacanta.in", "r", stdin); ^ user.cpp:54:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("provacanta.out", "w", stdout); ^ user.cpp:56:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tests); ^ user.cpp:60:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &N, &M, &K); ^ user.cpp:63:56: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1; i<=N; ++i) scanf("%d%d", &t[i], &p[i]); ^ user.cpp:64:56: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1; i<=M; ++i) scanf("%d%d", &T[i], &P[i]); ^ user.cpp: In function ‘void extracost()’: user.cpp:44:26: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] extra[i][j] = inf; ^