Compilare: main.cpp: In function 'int main()': main.cpp:39:39: 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:40:41: 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:42:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ main.cpp:44:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &stramos[0][i]); ^ main.cpp:48:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &b); ^ main.cpp: In function 'void compute()': main.cpp:9:35: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized] for(j=1;j<19 && stramos[j-1][i];++j) ~~~~~~~~~~~~~~^ main.cpp: In function 'int main()': main.cpp:9:35: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized] for(j=1;j<19 && stramos[j-1][i];++j) ~~~~~~~~~~~~~~^ main.cpp:8:9: note: 'i' was declared here int i, j; ^