Compilare: user.cpp: In function ‘int main()’: user.cpp:37:9: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(a[i] + 1); ^ In file included from /usr/include/c++/5/cstdio:42:0, from user.cpp:1: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^ user.cpp:37:9: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(a[i] + 1); ^ In file included from /usr/include/c++/5/cstdio:42:0, from user.cpp:1: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^ user.cpp:37:22: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(a[i] + 1); ^ In file included from /usr/include/c++/5/cstdio:42:0, from user.cpp:1: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^ user.cpp:146:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int nr = 0; nr < g[t].size(); ++nr) ^ user.cpp:156:20: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (valid(nou)) ^ user.cpp:31:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("delfin.in", "r", stdin); ^ user.cpp:32:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("delfin.out", "w", stdout); ^ user.cpp:34:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &n, &m); ^ user.cpp:37:23: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(a[i] + 1); ^ user.cpp:104:20: warning: ‘yc’ may be used uninitialized in this function [-Wmaybe-uninitialized] viz[xc][yc] = 1; q.push(nou); ^ user.cpp:53:20: warning: ‘yd’ may be used uninitialized in this function [-Wmaybe-uninitialized] viz[xd][yd] = 1; q.push(nou); ^ user.cpp:76:20: warning: ‘yt’ may be used uninitialized in this function [-Wmaybe-uninitialized]