Compilare: main.cpp: In function 'int main()': main.cpp:40:30: warning: for increment expression has no effect [-Wunused-value] for (j=maxx+1; j--; j>=0) ~^~~ main.cpp:15:21: warning: unused variable 'k' [-Wunused-variable] int n, m, i, j, k, p, q, maxx; ^ main.cpp:11:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("stramosi.in","r",stdin); ^ main.cpp:12:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("stramosi.out","w",stdout); ^ main.cpp:16:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:18:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &strm[i][0]); ^ main.cpp:28:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &p, &q); ^ main.cpp:15:30: warning: 'maxx' may be used uninitialized in this function [-Wmaybe-uninitialized] int n, m, i, j, k, p, q, maxx; ^~~~