Compilare: main.cpp: In function 'void citire()': main.cpp:49:14: warning: converting to non-pointer type 'char' from NULL [-Wconversion-null] s[m - 1] = NULL; ^~~~ main.cpp: In function 'void reconst(int, int, int)': main.cpp:71:6: warning: unused variable 'i' [-Wunused-variable] int i, xx, yy, x, y; ^ main.cpp:71:9: warning: unused variable 'xx' [-Wunused-variable] int i, xx, yy, x, y; ^~ main.cpp:71:13: warning: unused variable 'yy' [-Wunused-variable] int i, xx, yy, x, y; ^~ main.cpp: In function 'void citire()': main.cpp:36:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.in","r",stdin); ^ main.cpp:37:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("alpin.out","w",stdout); ^ main.cpp:40:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&n); ^ main.cpp:46:23: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s,10000,stdin); ^